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  • Articles  (534)
  • Blackwell Publishing Ltd
  • Chemistry and Pharmacology  (534)
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  • Articles  (534)
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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: People can eat a food without having a strong preference for it, and people can prefer a food without eating it. Given this seeming disconnect between attitude and behavior, which type of measure or segment can best be used to profile or identify loyal consumer segments of a food, such as soy? This research compares a usage-based method (heavy-light-nonusers) with a new attitude-based method (seeker-neutral-avoider), and finds that the attitude-based method differentiates purchase-related intentions better than the usage-based method. Implications for profiling consumer taste patterns and consumer segments are provided.
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In a recent paper, we described the development and application of a labeled affective magnitude (LAM) scale for assessing liking/disliking (Schutz and Cardello 2001). Here we present the exact numerical scale-point locations corresponding to the verbal labels of the scale, so that investigators can easily construct the LAM scale for use with either paper or computer-based ballots.
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This article describes an exploration of the concept of ‘oral freshness’ for as far as it is important in oral care. It intends to consider the most important mouth sensations and cognitive connotations, including (but not restricted to) the well-known effect of menthol in toothpaste.Two aspects were given attention:(1) The attributes that together form the concept of oral freshness were investigated using a ‘personal construct approach’(Kelly 1955). This method consists of unbiased, structured interviews with subjects, and ultimately yields attribute dimensions that the subjects have in common.(2) The intensity of the freshness sensation over time was investigated using the Time-Intensity method. Subjects gave repeated freshness judgments every few seconds after the intake of a freshness-related stimulus, and continued to do so after the stimulus had left their mouth. In addition we asked for ‘overall’ freshness judgments directly after the TI-measurements and after 2 months.The results confirm that ‘oral freshness’ is a complex concept. We identified 6 attributes, some of which were perceptual/physiological and some cognitive in nature: ‘water’-ness, cool/cold-ness, taste (menthol-ness), clean-ness, smell, energy (texture and touch, e.g., bubbles). Different persons will generally give different importance weights to each of these 6 attributes.Time-intensity measurements show that temperature, menthol-content and, to some extent, the presence of bubbles (energy) influence the momentous sensation of freshness. It appears, however, that in the way freshness is remembered after a few months, mainly cleanness and taste (menthol-ness) are important. Apparently, people tend to value (temporary) sensory input during the actual freshness experience, but tend to remember the freshness result in the longer run.
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Time-intensity (TI) methodology and a trained panel were used to characterize the perceived bitterness of Yerba mate (YM) Ilex paraguariensis infusions. Two sampling procedures (sip and spit; sip and swallow) and two conditions for residence time in mouth (free or fixed duration of 5 s until spit or swallow) were evaluated.At a fixed duration the maximum bitterness as well as the time to reach it showed a significant YM concentration dependence. No change on bitterness was observed by swallowing or spitting YM infusions except a larger rate of decay of the response (vr) at spit condition. Dynamic bitterness at free sampling time showed that the decision period to spit or swallow the YM infusion approximately duplicated the fixed one of 5 s.
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effect of fat and fat replacers (FR) on the flavor release from cherry ice cream was investigated. Protein based FR, Simplesse (“S”) and carbohydrate based FR, Litesse (“L”) either partially or completely substituted milk fat in ice cream. Overall and temporal flavor profiles of ice cream during eating were obtained using chemical and sensory analyses. The performance of FR depended on the level of fat it was substituting and the amount of fat present in the ice cream. In the reduced fat ice cream group, both FRs failed to mimic the characteristics of 6% fat ice cream, mainly because of the low retention of cherry flavor. In the full fat ice cream group, the sensory properties of ice cream containing “L” were closer to the full-fat (12%) ice cream than those with “S”. The critical flavor volatile compounds that strongly impact the sensory flavor attributes were identified.
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Response surface methodology was used to optimize formulations of chocolate peanut spread. Thirty-six formulations with varying levels of peanut (25-90%), chocolate (5-70%) and sugar (5-55%) were processed using a three-component constrained simplex lattice design. The processing variable, roast (light, medium, dark) was also included in the design. Response variables, measured with consumers (n = 60) participating in the test, were spreadability, overall acceptability, appearance, color, flavor, sweetness and texture/mouthfeel, using a 9-point hedonic scale. Regression analysis was performed and models were built for each significant (p 〈 0.01) response variable. Contour plots for each attribute, at each level of roast, were generated and superimposed to determine areas of overlap. Optimum formulations (consumer acceptance rating of ≥ 6.0 for all attributes) for chocolate peanut spread were all combinations of 29-65% peanut, 9-41% chocolate, and 17-36% sugar, adding up to 100%, at a medium roast. Verification of two formulations indicated no difference between predicted and observed values.
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper presents the results from a study of consumer reactions to different attributes of red and white wine, with stimuli presented in the form of small, experimentally designed, test concepts (conjoint measurement). The results show that possibly four consumer mind-sets exist, with each mind-set comprising a different set of communication drivers for concept acceptance. Most subjects fit into one of three key categories; “Classics” (who want their wines to be traditional), “Imaginers” (who want to get into the drinking experience through knowing details about their wines) or “Elaborates” (who want their wines to produce many sensations and flavors). A fourth group (No Frills), were interested in simple and safe wines without any detail of flavor or origin. This segment was found in the red wine study, but not in the white wine study.
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper describes a method that can be used to investigate consumers’ reported reasons for using a particular product. This method is applied to ratings of degree of agreement with statements about reasons for product use. The method is illustrated using data on self-reported reasons for smoking among adolescents. The approach used is based on a probabilistic model of similarity (Ennis et al. 1988) and provides a display of the density of respondents’ individual motivations concurrent with their perceptions of the statements. Factor analysis and its derived factor scores provide complementary information which is used to understand the interdependence of smoking motivations with the age of respondents and their degree of smoking. The probabilistic similarity model has many applications in studying consumer motivations such as those involved in the consumption of particular food and personal care products.
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The addition of hazelnut paste to dark chocolate formulations altered the sensory profile. The flavors chocolate, burnt, rancid, hazelnut, green and metallic, and the texture attributes hardness, graininess, consistency of melt, viscosity and onset of melt determined by descriptive analysis were significantly (P 〈 0.05) influenced by the addition of up to 10% hazelnut paste. The shelf-life of dark chocolates containing hazelnut exceeded 10 months. The textural attributes of hardness, consistency of melt and onset of melt were highly correlated to instrumental measurements.
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Astringent and bitter sensations are characteristic sensory qualities of black tea. Three different classes of potential astringent reference standards (two concentrations each of alum and tannic acid and three fruit juices) were evaluated in this study. The perceived astringency, bitterness and sourness of each were profiled using computerized time-intensity and compared with the astringent intensity of a standardized brew of black tea. The differences in temporal profiles of potential reference standards across taste attributes were evident and intensity ratings were found to be dependent upon the stimulus and its concentration. Both concentrations of tannic acid were evaluated as the highest in perceived bitterness. For the juices, a strong sour taste was perceived in addition to astringency. It was concluded that the best reference standard for the astringency of black tea is a solution of 0.7 g/L alum as it is low in perceived bitterness and sourness.
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  • 11
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 12
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: We developed an alternative method for the determination of 6-n propylthiouracil (PROP) taster status that is based on the comparison of intensity ratings of PROP solutions with intensity ratings of visual, tactile, and kinesthetic (physical) stimuli. We then compared the classification obtained with this method to those derived from traditional approaches. One hundred and forty-two subjects rated the perceived intensity of 0.000032, 0.00018, 0.00032, 0.0018, and 0.0032 M PROP, and 0.01, 0.032, 0.1, 0.32, and 1.0 M NaCl, as well as five levels each of perceived roughness of sandpaper, grayness of shades, and thickness of honey and water mixtures on the Labeled Magnitude Scale (LMS). Ratings for 0.00032 M PROP and 0.1 M NaCl were also compared in a one solution test. Subjects were classified as PROP nontasters, tasters or supertasters by all three procedures. Seventy-six percent of panelists were classified in a similar way by the physical stimuli and NaCl procedures, while 70% percent of panelists were classified similarly by the physical stimuli procedure and the one solution test, as well as by the NaCl procedure and the one solution test. Only 65% of panelists were classified similarly by all three procedures. Further, in replicate ratings of PROP solutions, supertasters’ evaluations of PROP at all concentration levels decreased significantly (P 〈 0.01) from the first to the second rating. It is evident from these findings that the method used to determine PROP taster status can greatly influence the outcome of any investigation of PROP taster status on other phenotypes.
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  • 13
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Judges were required to rate the total intensity of NaCl solutions using a variety of unstructured category and line scales under a ‘rank-rating’ protocol and a traditional protocol that did not allow retasting or the reviewing of scores. The various scales and protocols induced two types of scaling errors. The first type was named a different-stimulus error. This involved a judge rating a stronger stimulus as equal to or less than a weaker stimulus. The second type was named a same-stimulus error. This involved a judge giving different ratings to two stimuli of equal concentration. For all scales, judges made a higher proportion of same-stimulus errors than different-stimulus errors. ‘Rank-rating’ only reduced the proportion of different-stimulus errors. It was hypothesized that a category scale with fewer categories would induce a higher level of different-stimulus errors but lower level of same-stimulus errors. These trends were noted but not always significantly. For line scales, the equivalent hypotheses regarding line length were either weak or not supported. It would appear that increasing the length of a line scale is not always equivalent to increasing the number of categories in a category scale.
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  • 14
    Electronic Resource
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The assessor performance is a key point in a sensory evaluation. In particular, at the end of a session, a decrease of the performance can be feared. We propose to analyze this performance with various criteria: usual ones as the main product effect or the error variance; a new one measuring the perceived products variability. The performance can then be studied all along the session from two points of view: in taking into account the only products tested at a given instant (named instantaneous); in taking into account all the products tested up to a given instant (named cumulative). In the presented example, in spite of the large number of products successively tested by each assessor, the instantaneous performance of the panel shows no significant deterioration. Furthermore, when the number of products tested by each assessor increases, more significant product effects can be obtained thanks to the accumulation of the amount of data. This shows that the number of products that can be reasonably studied by one assessor during one session is generally underestimated.
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  • 15
    Electronic Resource
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The flavor of eight samples of commercial strawberry yogurt was studied by Free-Choice Profile analysis (FCP). Generalized Procrustes Analysis (GPA) applied to FCP allowed differentiation between samples and highlighted flavor attributes responsible for the observed differences. The relation between sensory and physicochemical datasets was studied by means of GPA. Those samples with higher carbohydrate content were perceived as sweeter, having stronger strawberry flavor, and with more dairy and yogurt flavors. Samples with higher titratable acidity, ash and protein content were perceived as more acidic and higher in intensity of “faulty” or “defective” flavors. Higher moisture content was associated with lower intensity of “dairy” flavors (creamy, dairy, and yogurt) and greater intensity of rancid flavor. It is concluded that, though not often used to this end, GPA is a suitable method to study the relationship of sensory and instrumental measurements.
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  • 16
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Two experimental procedures recommended for the evaluation of the psychophysical characteristics of odorous compounds, olfactory matching with the 1-butanol scale and cross-modality matching with the finger span are compared. The intensity of ethyl butyrate and guaiacol solutions presented at four different concentration levels was evaluated by a panel of sixteen subjects over five repetitions using the two methods. Each stimulus was delivered to the subject from a Teflon bag through a nose-shaped glass sniffing port.The discrimination ability, repeatability, panel homogeneity and within-subject variability of the methods were assessed. Results indicate that with both methods, subjects were able to highly discriminate the presented concentration levels of the odorants. There were no great difference in repeatability and the same individual variability was observed between both methods. However, the smaller within-subject variability highlighted for the 1-butanol scale method suggested that this method is potentially more powerful than finger-span method.
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  • 17
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The objective of this study was to verify key aroma-active compounds responsible for reconstituted fresh skim milk powder (SMP) aroma using threshold analysis, odor activity values, and model systems. Twelve odor-active compounds of SMP and one odor-active compound from fluid milk were selected based on flavor dilution factors from gas chromatography-olfactometry. Thresholds for the 13 odor-active compounds were identified using five-set ascending forced choice threshold analysis in odor-free water and fluid skim milk. Model systems were prepared using rehydrated milk retentate (RMR). The aroma of each model was evaluated by descriptive sensory analysis and by difference-from-control testing using a trained panel. The aroma of reconstituted fresh SMP and liquid skim milk were used as controls. Models containing a mixture of twelve of the thirteen chemicals had the most similar odor characteristics to rehydrated SMP aroma (9.0/10) indicating that these compounds constitute the character impact odorants of rehydrated fresh SMP.
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  • 18
    Electronic Resource
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The sensory characteristic “beany” is a limiting factor in introducing soy products to many consumers in western cultures. This research described sensory properties of beany flavor and described sensory odor characteristics of 19 chemicals that have been associated with beany aroma and flavor in previous literature. Seven concentrations varying from 1 to 100,000 ppm of each chemical (if soluble in propylene glycol) were examined by a five member trained descriptive panel. The panel described beany as having multiple attributes. Musty/earthy, musty/dusty, sour aromatics, and characterizing attributes such as green/pea pod, nutty, or brown collectively imparted beany aroma and flavor of most beans. Starchy flavor and powdery texture also were intrinsically associated with beany in bean product samples. Some chemicals tested were not beany at any level tested. Three alcohols, two ketones, one aldehyde, and one pyrazine exhibited beany characteristics (green/peapod or brown) only at low concentrations, generally 1-10 ppm.
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  • 19
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper deals with the analysis of drivers for self-defined craveability assessed in an Internet-based, conjoint analysis task. The stimuli comprised 36 descriptions of restaurant hamburgers, including product features, benefits, restaurant names, and emotional reactions that might ensue after eating the hamburger. Elements were combined into concepts by experimental design, and the resulting concepts evaluated by 145 respondents, on the attribute of craveability. Models relating the presence/absence of concept elements to ratings revealed that statements about the hamburger itself were the most powerful, but that no single element was highest across all the respondents. Segmentation of the 145 individuals by the pattern of their individual utilities revealed four key segments. These are Elaborates who may be sensory-oriented and respond strongly to product descriptions; Classics who like the notion of a grilled hamburger; Imaginers who respond to restaurant name and advertising copy; and Emotionals who respond to statements about food to descriptions how the eater feels after consumption.
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  • 20
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Judges were required to rate the total intensity of NaCl solutions and the sweetness of orange flavored beverages using a variety of unstructured category and line scales. Discrimination errors were noted for each type of scale. No strong differences were observed in discrimination between category and line scales although a 20-point category scale incurred fewer discrimination errors than 9-point category and line scales. Allowing judges to retaste stimuli and review and modify their scores reduced discrimination errors.
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  • 21
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 22
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 19 (2004), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The objectives of this study were to compare oral and nonoral sensory evaluation for discrimination of texture of acid skim milk gels and to establish whether nonoral attributes could be correlated to the oral perception of texture. Trained panelists (n = 13) identified 11 nonoral (visual and in-hand) and 4 oral attributes during a preliminary profiling session that could be used to discriminate textures (P 〈 0.001) in a range of acid gels prepared with different solid contents and heat treatment of the milks. Both methods of sensory appraisal were found to discriminate between gels. Correlation analysis showed high interrelationship between individual oral and nonoral attributes (P 〈 0.01). Principal component analysis revealed that all 4 oral attributes could be combined into one single attribute (PC1), with equal relative importance of the individual attributes in explaining the variance in the oral sensory data set. Canonical correlation analysis revealed good correlation between the oral and nonoral set of attributes (R2 〉 87.5%).
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  • 23
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Consumers unfamiliar with passion-fruit juice were presented with 24 computer generated package images on which six packaging factors (background color, picture, information, brand, language and shape) had been manipulated and asked to give scores for six expected sensory attributes (sweetness, pureness, sharpness, refreshing, freshness, naturalness) and liking. Significant effects were obtained for each attribute, with background color and information being the most important. Consumers varying in Need For Cognition (NFC) were affected differently by the investigated features of the package. High NFC individuals used less of the packaging factors than low NFC subjects did.
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  • 24
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The aim of the study was to determine how those texture attributes that elderly people find difficult to eat are related to their preferences for different modifications of carrot textures. This study was conducted with same methods in Finland and in the United Kingdom (UK). Trained sensory panels in both countries described sensory profiles of a range of carrot samples with same glossary of texture terms. The texture of carrot samples was manipulated using different preparation and cooking methods. Based on the Principal Component Analysis (PCA), boiled and puréed samples were perceived as soft, wet, pulpy and smooth, whereas raw samples were dry, brittle, rough, crispy and crunchy. Two age groups were used for the consumer tests: a young adult group aged 23 to 40 years, mean 32 (Finland) and 33 (UK) and an elderly group aged over 60 years, mean 75 (Finland) and 76 (UK). Both the elderly and young adult respondents considered samples as difficult to eat if they needed a long chewing time, were crunchy, hard, brittle, dry, rough or sharp, such as raw slices and coarsely grated samples. On the other hand, slimy, wet, smooth, soft and pulpy samples, such as boiled carrots and purée, were considered as easy-to-eat. The young adults liked more difficult textures such as rough, crispy, crunchy and hard than did the elderly respondents, but the easiest textures were not liked by either age group. Subjects with dental deficiencies liked easier textures more than those fully dentate.
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  • 25
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    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Aroma evaluation of 14 commercial red wines of the Uruguayan market (5 Tannat, 5 Cabernet Sauvignon and 4 Merlot) was done by descriptive analysis. Generalized Procrustes Analysis applied to the data allowed differentiating among the three groups of samples and obtaining sensory attributes that were responsible for these observed differences. The samples of Tannat were differentiated from Cabernet and Merlot samples and their aroma profile was characterized by secondary and tertiary descriptors of: berry (blackcurrant), dried fruit (prune), resinous (oak), spicy (liquorice) and microbiological (yeasty).
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  • 26
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: If a chi-squared analysis were to be performed to determine whether preferences were significant in a paired preference test, the appropriate expected frequencies in the analysis would represent those that would occur should the consumers have no preference. One way of determining these ‘no preference’frequencies, for a particular test situation, would be to note the preference responses obtained when the stimuli were putatively identical. Over 2000 consumers were given paired preference tests in which the stimuli were putatively identical. Response conditions and consumer groups were varied and the proportions of preference and no preference responses were noted. In a preliminary experiment, further research was seen to be justified when for putatively identical stimuli, judges did not exclusively express lack of preference; many expressed a preference for one or other of the stimuli. Further experiments were conducted using a written response condition and putatively identical potato chips (potato crisps) as stimuli. Using a single ‘no preference’option, variation in the placement of this option at either first, second or third place on the response sheet had no significant effect on the response frequencies. The proportion of ‘no preference’responses was approximately 30% in all cases. A previously reported 40-20-40 distribution was not always confirmed. The experiment was repeated with Korean consumers; these had fewer ‘no preference’responses. Deriving preferences from hedonic scales, rather than having judges respond to preference options, increased the proportion of ‘no preference’responses, with American judges still having more than Korean judges. Yet there are logical objections to extracting preference data from hedonic scales. Increasing the number of ‘no preference’options to two or three, had the effect of increasing the number of ‘no preference’responses up to as much as approximately 60%. Extending the results to Koreans, using two ‘no preference’options, it was seen that only the judges in an anonymous response condition had significantly fewer ‘no preference’responses than Americans. The use of these response frequencies as expected frequencies in chi squared analyses was illustrated, after adjustments for counterbalancing.
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  • 27
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The influence of thickening agent (0 and 7g/L), mechanical treatment (low and high) and flavoring agent concentration (2.2 to 63.2 μL/kg) on texture, taste and aroma of low fat stirred yogurts was investigated through sensory profiling by a panel of ten subjects trained on 13 attributes. Two assessment conditions were used: either in the presence or in the absence of olfactory perception (nostrils closed with nose clips). Sensory differences were greater for texture than for the other perception modalities. Olfactory perception enhanced yogurt astringency. If both thickener addition and mechanical treatment influenced texture attributes and rheology, the second factor had the strongest effect. Texture attributes were highly correlated with rheological parameters. Increasing flavoring agent concentration tended to decrease thickness and the addition of thickening agent depressed green apple notes and sweet taste, suggesting texture/flavor interactions.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The objective of study was to assess the influence of the knowledge of color and brand name on consumer response to tomato purees. From focus group interviews it was found that taste and odor of fresh tomato were the most important drivers of consumer choice. To quantify that information a questionnaire was developed and it was submitted to fifty consumers of tomato puree. The questionnaires answers confirmed those coming from the focus group, although same discrepancies were found with those derived from the consumer test. Results showed that color and brand name seemed to be more important than taste and odor of fresh tomato, in fact those attributes, when consumers were tasting samples, affected not only hedonic judgments but sensory perception as well. Finally physico-chemical parameters derived from instrumental measurements have been compared to sensory data by means of PCA in order to validate the consumers’assessment of sensory attributes of tomato puree.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Spices and condiments have been considered virtually indispensable in the culinary art. The quality of spices varies depending on the region of cultivation, climatic conditions and storage history. In the present study, coriander from 8 regions of India, labeled as R1 to R8, were examined for sensory quality by conducting threshold test, time-intensity study and flavor profiling. Principal component analysis (PCA) was carried out to group the samples. Threshold values ranged from 0.010 to 0.035% with R7 showing lower values for threshold (0.010%) followed by R8 (0.020%). Higher intensity of aroma of R7 and R8 was further confirmed by more of lingering aroma as shown by time intensity study. Flavor profiling by quantitative descriptive analysis showed that the coriander samples from different regions did not differ significantly (P± 0.05) in almost all attributes except for spicy aroma. Mapping of samples using PCA technique showed that the samples occupied different quadrants based on the intensity of attributes. Sample R7 and R8 were found to be grouped close together, and R5 and Reformed another group.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The influence of bite size on sensory mouthfeel and afterfeel sensations was explored in two studies in which single bites of vanilla custard desserts were varied from itollmL (study 1) and in which series of five bites of two different custard desserts were presented consecutively (study 2). In single bites, sensations of perceived creaminess were enhanced with size whereas sensations of astringency and temperature were suppressed. Bite size also affected perceived thickness, but the direction of the effects varied with custard desserts. With multiple bites, creaminess sensations continued to increase, whereas other sensations were unaffected. Switching to a second series of bites of another vanilla custard dessert showed larger sensory effects, especially on astringency sensations but also to a lesser extent on sensations of thickness and fatty afterfeel. Single and multiple bite results are discussed in terms of possible peripheral mechanisms. Switching results are discussed in terms of possible central sensory contrast mechanisms.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Mesquite (Prosopis sp.) is a fast-growing tree that produces abundant amounts of pods. Although these pods were once part of the diet of Southwest Native Americans, little is known today regarding the acceptability of mesquite flour. We standardized a recipe using mesquite flour with a commercially available ready-to-eat cereal product and tested the acceptance of the product with Native American participants (n=84). Participants were asked to complete a food acceptability survey and a food action rating survey to determine taste sensory perception and expected frequency of consumption. Although participants were significantly more likely (P= 0.008) to prefer the cereal without mesquite than with the mesquite added, participants reported favorable acceptability with the cereal, both with and without mesquite flour added. The results of the FACT food frequency survey were positive for both the product with mesquite added and without, with no significant difference (P= 0.07) between the two. These data support the potential for mesquite to be reincorporated as an acceptable ingredient in modern diets of Native Americans.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Oral sensory evaluation of caramel texture was conducted using six texture terms and results were compared to instrumental testing of texture. Trained panelists (n = 11) evaluated 6 caramel formulations by descriptive analysis. Mean texture values indicated that a slight increase in sweetened condensed skim milk and vegetable fat content (1% w/w at a 2:1 ratio) significantly decreased stickiness (P≤ 0.05). Decreasing corn syrup dextrose equivalent (DE) decreased stickiness and increased hardness (P≤ 0.05). Pearson correlation coefficients revealed that stickiness to teeth while chewing, toothpacking, and tooth adhesiveness were highly correlated with one another (P≤ 0.05). Sensory hardness, cohesiveness, and number of chews were correlated with the rheological properties of storage modulus and viscosity, while stickiness was correlated with probe tack force (P≤ 0.05). Such correlations show that fundamental rheological and tack force measurements can be used to help determine molecular mechanisms for sensory texture and stickiness.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: We show that adding replications in replicated difference tests results in larger power and smaller variance when the number of assessors is fixed. On the other hand, when the number of total assessments is fixed, the power usually decreases and the variability increases whenever replications are considered instead of different assessors. The appropriate numbers of assessor needed to gain the same power and variability, respectively, when replications are used will be given. It is shown that the number of assessors might indeed be reduced, but this has to be paid for by an increasing total number of assessments. We show that two key models, namely the mixture binomial and a corrected version of the Beta-binomial model, are quite similar with respect to the properties of interest. We provide tables from which, according to her/his requirements, the investigator might find an appropriate setting with respect to the number of assessors and replications.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The definition of “flavor” is a term that appears to vary from one area to the next. A survey was conducted on 140 individuals in various areas of specialization (agriculture, food science, sensory evaluation, and the chemical senses) to see what sensations are thought to be involved in “flavor,” as well as whether there were any differences in definitions across groups. The results demonstrate that while a fairly stable definition of the term does exist, there is some difference in what different groups of expertise mean when they refer to “flavor.”
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper presents the author's approach to synthesizing useful direction from product testing when the stimuli are not systematically varied. The approach presented here comprises a research design and data analysis strategy, rather than a conventional product optimization with subsequent validation. The design steps comprise stimulus selection, attribute selection, and product evaluation. The data analysis comprises univariate modeling to show how sensory attributes drive overall liking, reduction of the matrix to factor scores for multivariate modeling, and then the creation of an integrated product model. The outcome is a set of factor scores that can be translated to sensory attributes and in turn to target products.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A number of commonly consumed fruits and vegetables (e.g., kiwifruit, pineapple and taro) cause oral irritation, and there is anecdotal evidence that this influences the acceptability of such products. In each of these foods, oral irritation is produced by free crystalline calcium oxalate (raphides). The psychophysics of the mechanical oral irritation caused by raphides was studied in two experiments using a model system based on kiwifruit. In the first experiment, the location of irritant sensations and perceived intensity of the irritation caused by suspensions of raphides were determined using a ten-member trained sensory panel. Stinging and numbing were found to increase significantly with increasing concentrations of raphides. Stinging occurred principally on the tongue as well as in the throat and numbing principally on the tongue. The number of oral areas irritated was shown to increase with raphide concentration and to decrease over a 60-min period. In the second experiment, sugars (fructose, sucrose, glucose and inositol), acids (citric, malic and quinic) and an enzyme (actinidin) were added to the model to examine interactions between these chemical stimuli and the mechanical action of the raphides. Addition of acids to the model was shown to enhance irritation in addition to increasing sourness and suppressing sweetness. The addition of actinidin had no significant effects on irritation or tastes. It is suggested that acidity may aggravate irritation at low raphide concentration, but beyond a critical level of mechanical irritation the presence of acids has little additional effect. These results provide the first detailed data of the psychophysics of mechanical oral irritation in food, and have important implications for producing foods with lower levels of irritation and increased acceptability.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A standardized descriptive language for skim milk powder and dried dairy ingredients was developed. The lexicon was initially identified from a large sample set of dried dairy ingredients (138). A highly trained descriptive panel (n = 14) refined terms and identified references. Dried dairy ingredients (36) were then evaluated using the developed language. Twenty-one descriptors were identified for dried dairy ingredients. Seventeen flavors and tastes were identified in skim milk powders (27) with nine flavors/tastes observed in all skim milk powders. Dried dairy ingredients were differentiated using the language (P〈0.05). There were flavors common to all dried dairy ingredients while other flavors were specific to particular products.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Sensory properties and consumer perception of 2 ‘home-made’and 4 commercial dairy ice creams were examined. Conventional profiling by a trained panel found that most samples differed significantly in all attributes, but distinction of ‘home-made’from commercial products was limited to few attributes. Principal component analysis separated the ‘home-made’products from the commercial ones mainly on the basis of differences in appearance, aroma, creamy flavors and textural attributes. A consumer group (n=105) recorded preconception of ‘home-made’ice cream acceptance, then received the product samples, in unlabeled condition, for assessment of degree of liking (DOL) and for identification as ‘home-made’or commercial. Internal preference mapping of the DOL ratings showed that consumers were more closely grouped around samples which had higher intensities of certain attributes. Higher ‘denseness’, ‘vanilla’aroma and ‘buttery’flavor, were associated with more liking for commercial products. The ‘home-made’high fat sample, although liked, tended to be grouped with commercial products. More marked textural attributes of ‘ice crystals’and ‘breakage’aided identification of the low-fat ‘home-made’formulation, which was less liked overall. Overall, differences between the ‘home-made’and commercial samples were small but consumer perception of the term ‘home-made’was viewed favorably for dairy ice cream.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An established disparity between hedonic scales and just-about-right (JAR) measures, important for product development procedures, was examined for sweetness in lemonade by consumer groups divided on the basis of health concern level and consumption patterns related to sweet foods, regular and diet drinks and ‘healthy eating’. The disparity was demonstrated by all subgroups in that the JAR scale identified a lower sucrose concentration as nearest ‘just right’compared to that identified as ‘most liked’by the hedonic scale. Regression analysis predicted lower optimum sweetness for the JAR than the hedonic scale. For subjects who completed both tests the disparity was significantly different from zero. Trends of differences in response on both scales and for the disparity according to health concern and consumption patterns were demonstrated graphically. Few of these effects were statistically significant, but the differences in disparity level could justify market segmentation of drink products with different sucrose levels.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper presents results on consumer attitudes towards healthy soup, using conjoint analysis, executed on the Internet. The results show moderate interest in new ideas for the total panel, but reveal three concept-response segments. The first segment responds to nutrition and functional ingredients. The second segment responds to packaging and convenience. The third segment responds to taste and ingredients. Statistical analysis confirms the idea that they represent different ‘mind-sets’. The segmentation based on psychographic variables is a useful tool to identify the features of the next generation “healthy soups” and to design custom products on the basis of consumer requirements.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A statistical study was performed on the scores awarded by a taste panel over a full Roncal cheese manufacturing season. The panel evaluations were part of a quality control program carried out on that cheese under the auspices of the Appellation of Origin for Roncal cheese by panelists previously trained and qualified as proficient. Analysis of variance and factor analysis were performed to examine variability for the different attributes and the influence of such factors as cheesemaking plant and the manufacturing season and also to monitor panel reliability. The results indicated that the attributes associated with the descriptor “characteristic” had the highest variability; these attributes were characteristic odor, characteristic aroma, characteristic texture, characteristic flavor, and characteristic aftertaste. Cheesemaking plant was the factor that had the greatest effect on variability. Factor analysis and exploratory box plot data analysis were used to detect discrepancies between individual assessors and the rest of the panelists.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Different Spanish unifloral honeys (eucalyptus, sunflower, rosemary, thyme, lavender, citrus, anise, quercus, and lemon blossom) and one multifloral honey were studied by Free-Choice Profiling (FCP) analysis. Generalized Procrustes Analysis (GPA) applied to the FCP data allowed discrimination between samples and provided information on the attributes responsible for the differences observed. The honeys had significantly different sensory characteristics. Textural attributes were the predominant factor in discriminating between samples, and appearance (color included) was also correlated with GPA dimensions to a lesser extent.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper deals with responses to concept elements for grapefruit juice using hybrid conjoint analysis. Sensory-based concept elements perform as well (and as poorly) as do nonsensory-based concept elements. Concept-response segmentation analysis revealed three distinct groups, oriented to sweet taste, nonsweet taste, and color/appearance, respectively. Response patterns of segments are not polarized. What one segment likes most the other segment may simply accept to a moderate degree. This pattern differs from what typically happens with actual products. The segments differ in the way that they process the information in a concept, based upon response time as a separate dependent measure. Sensory-based concept elements may act as gatekeepers to assure respondents that the product is acceptable, and thus may shorten the search for additional information. In contrast, for products and sensory-preference segmentation, sensory attributes typically act as Drivers of LikingTM, rather than as gatekeepers.
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    Notes: The range of scores elicited by a structured, an unstructured and a ‘labels-only’version of the 9-point hedonic scale were compared using consumers from USA, Japan and Korea. It was found that the unstructured scale elicited a wider range of scores for American and Japanese consumers. After correction for hedonic ranges, it was found that Japanese had smaller ranges of scores on all three scales, although the effect was less pronounced for the unstructured scale. The Korean consumers were the exception. Their ranges were less than Americans but their ranges on the unstructured scale did not increase. The results were discussed in terms of the effects of inhibition of use of categories by the scale labels, effects of translation from the English, psychophysical style and order effects.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: STANDARDIZED OLFACTORY POWER LAW EXPONENTS. 2000. M. Devos, J. Rouault P.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Three brands of ready to serve mango drinks namely ‘Frooti’, ‘Real’and ‘Slice’that are available in the market were used for sensory evaluation along with the vacuum dried reconstituted mango powder drink. Mango powder was produced from mango pulp of ‘Totapuri’variety with addition of Maltodextrin, Glycerol monostearate and Tri calcium phosphate at rate of 0.62, 0.015 and 0.015 kg per kg dry mango solid, respectively. These ingredients were added for getting a nonsticky free flowing powder. The pulp along with the ingredients was dried in a vacuum drier at 70 ± 2C and 710–750 mm Hg vacuum. Fuzzy logic analysis was used for finding out the best of the three market mango drinks. BrimA index (a criterion for acceptance of fruit juice) and total solid (kg per kg drink) of the reconstituted mango drink was adjusted based on the BrimA index and total solid values of the best market drink. The reconstituted mango drink satisfied the quality criteria set for ‘mouth feel’but not the color, smell and taste.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: There are some theoretical difficulties in the philosophy and methodology of sensory difference and preference tests. The difficulties lie in the assumption that the subjects have the same response ability, which is in conflict with psychological ideas about the processes of perception and decision. A Bayesian approach may overcome these difficulties by treating the parameter of proportion as a random variable. This paper presents a Bayesian approach for analysis of data from such sensory tests.
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    Notes: Coffee served at temperatures recommended by the hospitality and food literatures for brewing and holding are above thermal pain and damage thresholds. Yet, consumers do not report pain or damage on drinking coffee at such temperatures. To investigate this discrepancy, the temperature of hot coffee before and during sipping was investigated for 18 subjects. Coffee temperature was continuously monitored by thermocouples in the cup, in the coffee bolus in the oral cavity and on the surface of the tongue. There was minimal cooling as the coffee entered the mouth from the cup, yet the coffee temperature was still above threshold for inducing burn damage. It is hypothesized that during drinking, the bolus of hot coffee is not held in the mouth long enough to heat the epithelial surfaces sufficiently to cause pain or tissue damage.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The application of sensory methodology for measuring deodorizing effect of an air conditioner equipped with electric plasma was introduced. Deodorizing effect was measured using chemical and sensory methods at different time (0, 30 and 60 min) and mode (control, blowing and cooling) of an air conditioner. Smoke from a roll of cigarette in a closed room was used as a source of odor and the concentrations of acetic acid and ammonia were measured as odorous chemical components. As one of the sensory methods triangle test was used and as a first step to obtain deodorizing effects by triangle test, the threshold of each panelist was obtained as the log dilution ratio of odor concentration at which the difference from odorless air was detected. The odor concentration at each time and mode was calculated using the threshold of the panel and the deodorizing effect was obtained on the basis of the odor concentration. In addition to a triangle test, scaling methods such as category scaling or magnitude estimation were used to measure deodorizing effect of an air conditioner. Deodorizing effects by scaling methods were calculated based on odor intensity with time at each mode. The regression analysis was done between the efficacy of deodorizing effect by sensory test and those by acetic acid and ammonia, the R2 values of the regression equations for triangle test, category scale, and magnitude estimation were 0.84, 0.72 and 0.69, respectively. Deodorizing effect by triangle test explained the decrease of acetic acid and ammonia better than those by category scaling or magnitude estimation while high cost and time consuming labor involved in triangle tests reduced the merit. The results of this study demonstrated that various sensory methods could be used to measure deodorizing effect of air conditioners and further researches on fast and reliable methods are needed to establish the official procedures.
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    Notes: A focus group study was performed to investigate the sensory vocabulary used by consumers of this product, together with general habits of its consumption. A total of 59 housewives distributed among six groups from three different cities in Argentina participated in the study. Differences in the groups across cities were small. Four groups would have been sufficient to generate the information and four was an adequate number of samples to aid in descriptor usage. The total number of descriptors used by the 6 groups were: appearance 65, color 39, aroma 44, flavor 50 and texture 70. A list of the most frequently mentioned positive and negative descriptors is presented. There were contradictions between the recall of reasons for consuming a sample and the sensory description of the same sample. The focus group method allowed obtaining the general profile of an ideal mayonnaise: pale yellow, shiny, with a mild flavor of lemon and egg, creamy in texture and easy to spread.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In the present paper, two indices, agreement coefficient and reliability coefficient, are introduced and proposed to measure quality of ratings data given by a sensory descriptive panel. Agreement coefficient describes variation of ratings for a single target (product), whereas reliability coefficient reflects discrimination ability of a descriptive panel for a sample of products. The two indices, which profoundly describe inherent characteristics of ratings data, are based on classical reliability theory and recent advances in psychological measurement. In the paper, estimates and tests for the two indices are provided. Confidence intervals for the indices are derived. A space with the two indices as dimensions, which is referred as rating quality space, gives visual presentation of performances of a descriptive panel or individual panelists. Numerical examples illustrate the use and interpretation of the indices.
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    Notes: Anderson's statistic, which compares distributions of ranks, is generalized to cope with tied rankings. A simple example is given to illustrate the calculations involved. In market research work it is often important to compare distributions as well as mean values. Comparison of distributions can indicate either market segmentation or product variability.
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    Notes: FOOD TEXTURE AND VISCOSITY, CONCEPT AND MEASUREMENT by Malcolm Bourne.
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    Notes: Asian white radish processed foods are commonly consumed in Japan and Korea and are increasingly available in many Western countries. The major flavor constituent of Asian white radish, 4-methylthio-3-trans-butenyl isothiocyanate (MTBITC), was extracted as an oil and added in varying concentrations to an unflavored cracker biscuit. Untrained taste panels of Japanese, Korean and Australian nationals were presented with treated biscuits and their concentration preference for MTBITC determined. The taste preferences (degree of liking) of the Japanese and Koreans differed markedly with the Japanese preferring biscuits containing 110 μmole MTBITC/100 g while the Koreans preferred 〈 50 μmole/100 g (the lowest concentration tested). The difference is attributed to the Korean use of Asian white radish in highly spiced foods compared to the Japanese use without the addition of strongly flavored ingredients. The Australians also preferred 〈50 μmole/100 g but this was probably due to unfamiliarity with eating white radish.
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  • 56
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    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: We compare the sensory profiles of six dark chocolates done by two types of juries: some trained juries and an untrained jury. Six laboratories, each one made up of 10 to 15 judges, are regarded as trained juries since the assessors were well trained before the evaluation of the products. The second type of jury is composed of only one panel of 29 untrained assessors and this jury is named the untrained jury. Fourteen attributes were evaluated and analyses of variance have been carried out by attribute to compare the sensory profiles of the six chocolates done by the trained juries and by the untrained jury. These analyses of variance show that the two types of juries give similar sensory profiles and that the few differences are mainly due to different ways of using the scale.
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  • 57
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    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The sensory data from three different methods, multidimensional sorting, similarity scaling, and free-choice profiling were compared using ten commercial grape jellies as a model system. Without any prior training, the overall similarities/dissimilarities between stimuli were judged using both multidimensional sorting and pair-wise scaling and the sensory attributes were rated using free-choice profiling by different panels. A two-dimensional stimulus configuration best represented the data from each of the three methods. The underlying dimensions of stimulus space were identified from free-choice profiling data and also explained some background variables. The texture, sweetness, sourness, grape flavor and color contributed to both dimensions. All three methods were very similar in describing the most important differences among stimuli as suggested by the highly significant correlation between their first dimensions. The Procrustes analysis coupled with permutation tests, as well as RV coefficient, indicated that similarity scaling and free-choice profiling reached maximum consensus, whereas multidimensional sorting shared slightly lesser consensus with the other two methods.
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  • 58
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This study aimed to check the hypothesis that aroma concentration in the aqueous phase of an oil-in-water emulsion controlled the odor intensity of single aroma compounds. A set of flavored oil-in-water emulsions, prepared according to a 22 experimental design (aroma concentration, oil volume fraction) with two central points, was assessed for odor intensity by a 24-member panel during four sessions. In each session, three of the four-studied aroma molecules (benzaldehyde, ethyl butyrate, linalool and acetophenone) were investigated. Whatever the aroma, the experimental data showed that the oil volume fraction of the emulsion (from 0.12 to 0.48) did not influence the odor intensity. For each emulsion composition, aroma concentrations at equilibrium in both phases were calculated using the oil-water partition coefficient of the compound. Odor intensities, estimated from aroma concentration in the aqueous phase using previously reported modeling of odor intensity above water solutions, were then compared to experimental data. It is confirmed that the perceived odor intensity is governed by the aroma concentration in the aqueous phase at the time of the trial and not by the averaged apparent concentration in the emulsion.
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  • 59
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    Journal of sensory studies 17 (2002), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Many researchers have compared results from experiments using paper ballots and computer ballots, yet few have studied the interchangeability of the two data collection methods. If computers fail between sessions of an experiment, one would like to be able to use paper ballots for that session with some confidence that the experimental results will not be affected. The objective of this study was to determine if ballot type had a significant influence on descriptive analysis results. Multivariate analysis of variance indicated no significant differences (P〈0.05) between ballot types. No significant sample * ballot interactions were found from the univariate analysis of variance. Mann Whitney nonparamatric tests found that substituting paper ballots for computer ballots in a single session did not significantly alter experimental results. One can conclude from this experiment that if a situation occurs forcing panelists to use an alternative ballot, the results probably will not be significantly affected.
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  • 60
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    Journal of sensory studies 17 (2002), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 61
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    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Sensory profiling laboratories rate products for sets of attributes. Order of tasting and carry-over effects from sample to sample are widely recognized. However, within samples, work investigating the possibility of effects due to the order of rating attributes and attribute to attribute carry-over has not been reported. Individual attributes were classified according to whether their presence in a product was perceived to be desirable or not. For both yoghurt and cheese, sample ratings for each attribute were compared when attributes perceived as desirable preceded those perceived as undesirable and vice-versa. In both stimuli, there was evidence that desirable attributes were biased to a lower value when preceded by undesirable ones. Similarly, negative attributes were biased downwards when preceded by desirable ones. For absolute scores, these effects, albeit small, make randomizing attribute ordering desirable. However, lack of evidence of interactions between samples and attribute ordering suggests comparative differences between samples are unaffected.
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  • 62
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    Journal of sensory studies 17 (2002), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pork patties from M. longissimus dorsi and M. psoas major were used by a sensory panel to develop a descriptive vocabulary to describe warmed-over flavor development. The patties were made from meat from animals supplemented with one of four dietary treatments, (I) control diet, (II) supplemental iron (7 g iron (II) sulfate/kg feed), (III) supplemental vitamin E (200 mg dl-α-tocopherol acetate/kg of feed) and (IV) supplemental vitamin E + supplemental iron. The sample set used for training reflected the variation in muscle type and degree of warmed-over flavor development (day 1 and 5). The sensory terms selected had to be relevant to the samples, discriminate between the samples, have cognitive clarity and be nonredundant. Based on these selection criteria an initial training list of 36 sensory terms consisting of odors, flavors, basic tastes and aftertastes was developed in a pretrial using experts with product knowledge. This list constituted the start of training the panel. Principle Component Analysis (PCA) and assessor suggestions were used for reducing the number of terms and after 5 days of training this list was reduced to 21 sensory terms. The discriminative ability of the sensory panel improved over the course of sensory training and was quantified by using the mean assessor signal to noise ratios (S/N) for the sensory terms for each training session. This signal to noise ratio is essentially the total initial variance divided by the residual cross-validated variance. Subsequent detailed multivariate analysis found that the bilinear descriptor leverage was a particularly efficient method for term reduction.
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    Journal of sensory studies 17 (2002), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The objective of this study was to investigate the effect beverages have on subsequently perceived basic tastes. Two types of milk, Cola and water were used to rinse the mouth prior to conducting a Time Intensity study with basic taste solutions. From this some effects of the prior beverage onto the TI parameters was found. Especially Cola showed an effect on the intensity of the subsequently tasted sweet taste, and whole milk showed a stronger effect than skim milk. The effects showed both in size and timing of the basic taste intensities.
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    Journal of sensory studies 17 (2002), S. 0 
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    Journal of sensory studies 17 (2002), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The objective of this study was to determine the effect fat has on the intensity of sweet, salty, sour, bitter and umami tastes in oil-in-water emulsions. The first experiment used two levels of fat (9% and 17% in oil-in-water emulsions) and two intensities of each taste (high and low). We compared the taste intensities of these emulsions to the intensities of oil-free samples with equal total volume, and to oil free samples of the same aqueous taste compound concentrations. Because of potential confusion between taste intensity and viscosity, we repeated the experiment, having panelists rate both thickness and taste intensity. Diluting with oil, compared to diluting with water, decreased bitterness, but increased the intensity of salty, sweet, sour and umami tastes. When compared to samples with equal aqueous taste compound concentrations, fat suppressed bitterness, but had no effect on the other tastes.
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  • 66
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    Journal of sensory studies 17 (2002), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This study was undertaken to establish category and product descriptive characteristics of commercial creamy style peanut butters for use in subsequent modeling of consumer response. An established descriptive lexicon for peanut flavor was modified with additional appearance and texture terminology to describe these samples. To determine the full category space for the appearance, flavor and texture characteristics for commercial creamy style peanut butters, a highly trained descriptive panel screened 42 brands. A subset of 22 peanut butters was identified which represented the available range of appearance, flavor and texture variations and determined the product category. These 22 commercial creamy style peanut butters were subsequently evaluated and quantitatively described using 4 appearance, 19 flavor and 12 texture descriptors. Using both hierarchical clustering and principal component analysis, 4 logical associative groupings of products were identified: store and name brands, natural brands, reduced fat brands, and some store or name brands with unique or unusual appearance, flavor or texture characteristics. Omission of products with redundant characteristics within a factor grouping enabled further reduction to 15 products for subsequent quantitative consumer testing to establish a model for descriptive analysis as a predictor of consumer research responses.
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    Journal of sensory studies 17 (2002), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Roncal cheese is made from raw ovine milk and is regulated by an Appellation of Origin. This cheese variety is quite popular with consumers because of its special properties, which are unlike those of other ewe's-milk cheeses. To date there have been no studies aimed at characterizing the flavor and odor attributes of Roncal cheese. To remedy this situation, sensory analysis has been performed using Roncal cheese samples collected from artisanal and industrial cheese-making establishments. The cheeses were made at three different times of year (winter, spring, and summer) and were ripened for four or eight months. Sensory descriptors were generated, and after discussion suitable descriptors for describing and discriminating among Roncal cheese samples were selected by multivariate analysis. In all, 19 descriptors were employed, namely:odor: cream, meat broth, olive, toffee, liquid caramel, toasted, acetic acid, sweat, acidified milk, ammonia, leather, stable straw, wool, and odor intensity.flavor: characteristic flavor, acetic acid, sweat, butyric acid, and flavor intensity.
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  • 68
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Two independent, highly trained panels separately conducted descriptive analysis of orange juices using different descriptive analysis methods and sets of samples. Lexicons were developed independently. One panel evaluated 23 orange juice products and identified and referenced 24 attributes. The other panel evaluated 17 products and identified 17 attributes for testing. Though not identical, the lexicons developed by both panels were similar overall. To compare the sensory space of the product category, Principal Component Analysis (PCA) and sensory maps were developed separately for each panel. The comparison showed that the underlying sample spaces obtained from both panels were comparable in many ways. Key flavor characteristics for the same types of orange juice products were described similarly by both panels. These data indicate that the process of using highly trained panels that define attributes and use reference standards for descriptive sensory analysis can give objective and comparable information for a product category across different panels.
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    Journal of sensory studies 17 (2002), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Can labels suggestively influence sensory perceptions and taste? Using a “ Phantom Ingredient” taste test, we show that the presence or absence of a labeled ingredient (soy) and the presence or absence of a health claim negatively bias taste perceptions toward a food erroneously thought to contain soy. We found a label highlighting soy content made health claims believable but negatively influenced perceptions of taste for certain segments of consumers. Our results and discussion provide better direction for researchers who work with ingredient labeling as well as for those who work with soybean products.
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  • 70
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Using an intensity rating with no external calibration, experiments were designed to measure the sensory oil-water partition coefficients of four aroma molecules (benzaldehyde, ethyl butyrate, linalool and acetophenone) as the ratios of concentration producing stimuli of equivalent intensities. Flavored water and oil phases were successively assessed for odor intensity by 24 panelists who were given total freedom regarding scaling strategy. Each session combined five concentration levels of three out of the four studied aromas in a solvent (water or oil). A predominant concentration effect was found for each aroma in both solvents and concentration dependencies of perceived intensity above water and oil were similar. Experimental data were modeled with Fechner, Stevens and Hill equations. Combining results above water and oil solutions to feed a common model led to the evaluation of an overall sensory oil-water partition coefficient for each aroma compound. All three models produced similar partition coefficient values for each aroma that were lower than the related instrumental partition coefficients. Biases previously detected when external calibration had been used were reduced in a large proportion while suggested enhancement of odor intensity by water vapor could not be excluded.
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    Journal of sensory studies 17 (2002), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Variability is a fundamental characteristic of sensory profile data. Ignoring the variability may result in biased solutions that cannot be improved by the collection of additional data. Probabilistic multidimensional scaling (PMDS) models provide a means of accounting for the variability inherent in sensory data by using distributions, instead of points, to portray sensory objects. For profile data with high levels of variability, the probabilistic model recovers latent structure parameters very well — traditional deterministic MDS models and principal components analyses (PCA) do not. Advantages of the PMDS models include their parsimony, testability and extensibility. Two particularly attractive PMDS attributes are their ability to relate consumers’ expressions of liking to product profiles and their ability to estimate a product's “ perceptual share” from liking and profile data. Used as a criterion with what-if modeling, perceptual share estimates enable the evaluation of alternative product development strategies.
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    Journal of sensory studies 17 (2002), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Judges on anti-nausea medication, used hedonic scales to assess a set of foods and beverages on two occasions, initially on beginning a treatment with anti-nausea medication and then four weeks later. To detect the possibility that changes in hedonic scores for the foods and beverages may be caused not by changes in liking but by ‘scaling drift’: changes in the use of the scale, control stimuli were also assessed. These control stimuli were sets of stimuli to be assessed for intensity and a set to be assessed for liking. These latter stimuli were a class of stimuli that were unlikely to be liked to a different extent on the two testing occasions. The lack of change in the control stimuli and the change in the hedonic scores for the foods and beverages suggested that the latter was due to changes in liking for the foods and beverages rather than ‘scaling drift’.
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    Journal of sensory studies 17 (2002), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The objectives of the present study were to measure the sensory profile and acceptability of 8 commercial samples of mayonnaise (4 whole fat and 4 low fat) and then to apply preference mapping to address the relationship between the descriptive and acceptability data. A total of 240 consumers were recruited in 3 Argentine cities. In each city 40 young adults and 40 older adults were recruited. Samples differed in their sensory profiles and average acceptabilities. Cluster analysis of consumers showed clear segmentation in appearance, texture, flavor and overall acceptance. Sensory acceptability segmentation was far more pronounced than age or city segmentation. Extended preference mapping showed the sensory descriptors of mayonnaise which drove the acceptability of some of the consumer clusters.
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    Journal of sensory studies 17 (2002), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper deals with the design and optimization of lemon juice, a common ingredient in different foods. Lemon juice is usually added for flavoring purposes to different foods, consumed under different conditions. Through experimental design and evaluation in multiple carriers, the product developer can identify the combination of ingredients in lemon juice which, in concert, generate an acceptable product. Through optimization, taking into account these different end-uses, the developer can create a product that will perform well in different types of carriers.
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    Journal of sensory studies 17 (2002), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: We tested the hypothesis that exposure to an aroma through a food or beverage in the first part of a meal (preload) would reduce the consumption of a food with the same aroma in the second portion of the meal, because of olfactory-specific satiety. In a first experiment, 35 young, normal-weight adults participated in 2 lunch sessions during which they consumed a fixed preload of either ranch-flavored or plain potato chips and sparkling water, followed by ad libitum consumption of a pasta salad with ranch dressing and sparkling water. In the second experiment, 33 subjects consumed a fixed preload of either lemon-flavored or plain sparkling water and pasta salad with ranch dressing, followed by ad libitum consumption of lemon-flavored yogurt and plain sparkling water. No difference was observed in the amount of food consumed (corrected for session order effects) as a function of prior exposure to ranch flavor in the chips or lemon flavor in the water. We conclude that exposure to a preload aroma may not have a significant effect on subsequent intake of a food with the same aroma.
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    Journal of sensory studies 17 (2002), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The tenderness of carcasses of ten bulls of Norwegian Red breed was analyzed by sensory and mechanical analyses. Four samples representing the range of tenderness in the material were served to 118 consumers in an in-house test. The consumers rated the samples for the degree of tenderness. High correlation was found between sensory analyses and the consumer ratings of tenderness, r = 0.96 (P〈0.0005), and between Warner Bratzler Shear force values and the consumer ratings, r =− 0.87 (P〈0.005).The consumers found it easier to evaluate the very tender and very tough samples, while the moderately tough samples were more difficult to evaluate, and were mixed up in both the sensory and consumer analyses.A lower percent of women than men considered each sample as acceptably tender and women in general used a lower grade to describe the degree of tenderness of the samples. Indications of high variety of consumer acceptability at different levels of tenderness, suggests a need for a larger study of tenderness levels in the areas where large changes in acceptability are found, and of responses from different consumer groups.
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    Journal of sensory studies 17 (2002), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Mapping is a popularly accepted statistical method, currently used in many applications in order to reveal and perhaps understand relations between stimuli. This paper discusses some of the shortcomings of mapping as a procedure, specifically those having to do with the ‘actionability’ of the data. The paper recommends that mapping be used to embed the stimuli in a geometric space, but then the coordinates of that space be used as independent variables in a model. In this way the geometrical representation does not stop at being a ‘pretty picture’ without further utility, but instead incorporates within it the necessary tools to allow researchers to go from any location in the space to any other location.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The objective of this study was to demonstrate that the dimensions of a sensory booth modified to comply with the Americans with Disabilities Act of 1990 (ADA) guidelines have no impact on consumer evaluations of chocolate pudding. One set of booths each were constructed per ASTM and ADA guidelines. Control pudding was prepared according to package directions with 2% fat milk; other treatments were modified with red food coloring, sugar or nonfat milk. Twenty-four panelists evaluated instant chocolate puddings in directional difference and hedonic tests in each type of booth. Booth type and test date had no effect on judgments.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Communication and replication of sensory data from different sites are important to track progress on fundamental research issues and to ensure that research efforts are not duplicated. A uniform anchored Cheddar cheese sensory language has previously been identified and refined. The objective of this study was to demonstrate application of the defined sensory language for Cheddar cheese for communication between sensory panels at three different sites. The defined and referenced sensory language for Cheddar cheese was disseminated to panel leaders at the three sites and sensory panels (n ≤ 8) were trained for 40 to 80 h at each site. Ten forty-pound blocks of Cheddar cheese representing different ages were collected and evaluated by the panels. Cheeses were differentiated by the three panels by univariate and multivariate analysis (P〈0.05). Cheeses were differentiated by the three panels in a similar manner. Results indicate that it is possible to calibrate panels using a standardized defined sensory language.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Clothing movement was evaluated on a video screen by a descriptive analysis sensory technique and correlated to tactile attributes and fabric mechanical properties. Six fabrics were tailored into identical wide-leg trousers and dresses, animated by a professional model, filmed and edited for sensory evaluation. Tactile attributes were assessed sensorially and fabric mechanical properties were characterized by F.A.S.T. (Fabric Assurance by Simple Testing) and drape measurements. The following bipolar attribute pairs dominate movement language and perception: flowing to stiff and heavyweight to lightweight. Perceptual space of clothing movement is essentially two dimensional and high correlation coefficients between visual and tactile attributes were found. The fabric drape coefficient correlates highly with visual and tactile attributes and is a simple screening method for clothing movement prediction.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This study aimed to identify a scaling technique, which would offer the greatest degree of discrimination and accuracy in an evaluation of soup samples, varying in salt concentration (0.3, 0.8 and 1.3% salt). A Seven Point Category Scale, a 100 mm Line scale and non-modulus Magnitude Estimation were used to evaluate samples by consumers (n = 36).A Friedman Two-Way ANOVA and a Wilcoxon Signed Ranks test were applied to the data to compare discriminatory ability and accuracy of the scaling techniques. Results revealed that each of the techniques could be used to discriminate between samples (P〈0.001). However, none of the three techniques were significantly more accurate than one another. In view of the results and consumer preference/comments for using the Seven Point Category Scale, this technique is proposed as an effective method for consumer rating of salt intensity.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Sherry wine vinegar is a highly appreciated product due to its sensory properties which are acquired thanks to its aging in wood. Despite its relevance, studies involving aging of vinegars are scarce. In this paper, sensorial characteristics of Sherry wine vinegar had been studied during aging. Samples were obtained by acetifying Sherry wine in the laboratory and aging them in oak wood casks for two years. By means of triangle tests, significative differences have been found among vinegars aged 0, 6, 12, 18 and 24 months. In order to obtain more information descriptive analysis was performed. Sherry wine vinegars were described on the basis of the attributes previously selected and from these results their spider charts were drawn. The remaining alcoholic degree of vinegars plays an important role in the ethyl acetate and woody aroma components. Overall impression, aroma intensity and quality clearly increase with aging.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Defatted soybean flour mixed with a combination of 0.03% Red No. 40 and 0.01% annatto (Bixa orellana) colorants was extruded into textured soy protein (TSP) in a counter-rotating twin extruder to produce a red-meat like product suitable for hamburger patties. Ground beef patties were processed replacing the meat (15 and 30%) with resulting hydrated textured soybean protein (TSP) prepared with and without the colorants. The resulting cooked patties were evaluated by eight trained judges for tenderness, juiciness, number of chews, beef flavor and overall flavor quality using a nine point nonstructured horizontal scale. Other patty characteristics examined included cooking losses (weight loss and diameter reduction) and color, by tristimulus colorimetric measurement. The results from sensory analysis revealed that ground beef patties with high TSP level were more tender than control, and they had less beef flavor and overall flavor quality. Weight loss was not significantly (P 〉 0.05) affected by TSP level but the patties with 30% TSP showed less shrinkage than the others. Results of the study suggested that while patties with 15% TSP had sensory attributes similar to the control, adding 30% TSP with coloring significantly (P 〈 0.05) increased the redness of the patties.
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    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The present study considers the influence of reducing the fat content of ovine milk on the sensory and instrumental texture characteristics of the resulting cheeses. Three manufacturing runs were performed. In each run three cheese batches were manufactured using milks with differing percentage fat contents (8%, 4%, and 2% fat). Analysis of cheese samples was performed at 60, 90, and 120 days of ripening.The instrumental method used to evaluate cheese texture was uniaxial compression at constant speed, taking readings of stress, strain, and modulus of elasticity (E). Statisticalanalysis revealed differences forboth the differentfat contents and the ripening times considered. Instrumental parameter values increased with lower cheese fat contents; with a 20% reduction in the fat to dry matter content from full-fat to reduced-fat cheeses, resulting in a 35% increase in maximum stress and in the slope of the stress-strain curve at the end of ripening. The greatest sensory differences between samples were recorded for firmness.
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Judges rated the intensity of NaCl solutions using magnitude estimation and the labeled magnitude scale. They performed under four response conditions that varied in reliance on memory: (1) verbal response, (2) written response with no retasting and the response sheet removed, (3) written response with a single response sheet which allowed past scores to be reviewed and amended but with no retasting, (4) the same as ‘3’ but with retasting. Discrimination errors tended to decrease from conditions ‘1’ through ‘4’ yet the major and significant effect was allowing judges to retaste stimuli. The effects of how forgetting lowered discrimination were discussed in the context of experimental design and the absolute versus relative cognitive models of scaling.
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  • 87
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Soyfortified paneer (SFP) samples prepared from blends containing different proportions of buffalo milk of varying fat content and soy milk (7.5 °B) were evaluated organoleptically for assessing the quality attributes like body and texture, flavor and taste, color and appearance and the overall acceptability. Sensory data were analyzed using fuzzy logic approach, which addresses the problem of data classification in a unified qualitative and quantitative manner. Results of the study indicated that the fuzzy multiattribute decision making approach provide an adequate and reliable system for product formulation and comparison, based on sensory data. The developed fuzzy mathematical model performed remarkably well in the evaluation and ranking of various SFP samples. The SFP sample made from blend of buffalo milk (4.5% fat) and soy milk (7.5 °B) in the proportion of 90:10 was found to be the most acceptable one for different classes of consumers irrespective of their preferences for a particular sensory quality attribute.
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  • 88
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The jaw movements and muscular activity of masticatory muscles of five assessors, having bitterness thresholds about 8 μM quinine in water, were monitored throughout chewing of similar strength gelatin gels containing 0, 40, 70 or 100 μM quinine. Gel bitterness ratings were not related to sensory texture which was 78kN/m2 by shear test. On average, 100 μM quinine gels were as bitter as 7 to 30 μM quinine in water, depending on the assessor. Chewing patterns were not affected by concentration of quinine in the gels. During mastication of acceptable gels, there appears to be no feedback from taste to the motor control of mastication. In gels of the same consistency and the same concentration of quinine, assessors who chewed more rated higher for bitterness. The implications for mimicking mastication by machine and the training of assessors for solid foods are discussed.
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  • 89
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Relationships between odor properties and volatile chemical composition were explored on 39 cocultures of three different yeasts, three Geotrichum candidum and five bacteria, commonly used in bacteria and mold surface ripened cheese. Sensory profiling was performed by ten trained judges by scoring the intensity of 14 odor attributes. At the same time, the volatile compounds of the cocultures were extracted and analyzed by dynamic headspace gas chromatography and mass spectrometry. Sensory and instrumental data were compared and correlated using correlation analysis and partial least squares regression analysis. The sample plot including the whole set of samples evidenced a clustering of the associations containing the yeast strain Kluyveromyces lactis and any bacteria. They developed strong fruity olfactory notes related to their high content of ethyl esters and various alcohols. The sample plot on a restricted set of samples evidenced the fruity characteristics of Debaryomyces hansenii and bacteria associations and the cheesy odors of Yarrowia lipolytica and Geotrichum candidum cocultures that produced sulfur compounds.
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  • 90
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Differences in the physical shape of glasses could potentially influence proportions of aromatic compounds trapped in the headspace of a wine glass, altering the perception of a wine. Blindfolded, naïve subjects assessed the aroma of a California Cabernet Sauvignon presented in 4 different glasses. Two of these were from a speciality line of crystal wine glasses, one designed for Chardonnay, the other for Bordeaux/Cabernet Sauvignon. A restaurant-style wine glass and a leaded crystal goblet were the remaining vessels used. The nonexpert judges assessed wine aroma for total intensity, fruitiness, vinegariness, oakiness, and mustiness, as well as liking.The only significant difference found in the aroma intensity ratings was for the Bordeaux glass, which was rated as having a significantly lower total intensity than the other three glasses. However, several significant correlations were found between the attribute intensity ratings and physical characteristics of the glasses. This suggests that the glass does have a limited, but subtle, impact upon the olfactory experience of wines.
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  • 91
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Profilograms based on the quantitative descriptive analysis (QDA) of jamun using nine attributes were drawn for four market samples and ten samples prepared using various instant mixes available in the local market. The instrumental texture measurement of shear values were determined for all the samples. Correlations between sensory and instrumental texture measurement (shear force) were studied. The shear values were found to be correlated positively with softness, juiciness and milkiness. Further canonical discriminant analysis was run to position the samples in relation to others. The results indicated that samples M1, M2, M4, S3, S4, S6 and S10 group together in the same quadrant which represents desirable attributes of jamun viz, color, softness, juiciness, milkiness and overall quality. The jamuns from the instant mixes (S) can replace the control samples, traditionally prepared market samples (M) as they match the product profile very closely.
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  • 92
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A popular product testing procedure is to obtain sensory intensity and liking ratings from the same consumers. Consumers are instructed to attend to the sensory attribute, such as sweetness, when generating their liking response. We propose a new model of this concurrent ratings task that conjoins a unidimensional Thurstonian model of the ratings on the sensory dimension with a probabilistic version of Coombs’ (1964) unfolding model for the liking dimension. The model assumes that the sensory characteristic of the product has a normal distribution over consumers. An individual consumer selects a sensory rating by comparing the perceived value on the sensory dimension to a set of criteria that partitions the axis into intervals. Each value on the rating scale is associated with a unique interval. To rate liking, the consumer imagines an ideal product, then computes the discrepancy or distance between the product as perceived by the consumer and this imagined ideal. A set of criteria are constructed on this discrepancy dimension that partition the axis into intervals. Each interval is associated with a unique liking rating. The ideal product is assumed to have a univariate normal distribution over consumers on the sensory attribute evaluated. The model is shown to account for 94.2% of the variance in a set of sample data and to fit this data significantly better than a bivariate normal model of the data (concurrent ratings, Thurstonian scaling, Coombs’ unfolding model, sensory and liking ratings).
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  • 93
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Expected acceptability and actually taste acceptability of meat and other foods were determined in elderly subjects. Subjects gave an acceptability score, followed by a free description of the strong and weak points, first from memory during an interview and then after tasting each food. Taste acceptabilities of lamb, fish, poultry, veal and pork were similar to those expected during the interview. Significant discrepancies between observed and expected acceptability were found for beef, processed pork, eggs and rabbit meat. Beef was described as “ tough” after tasting while it was expected as being “ tender” in the interview; processed pork was associated with “ good quality” and “ good texture” during tasting whereas, “ too fatty” with no strong points were expected in the interview; rabbit was criticized for “ dry texture” more often in the interview than after tasting; eggs were popular for their “ soft texture” and “ good taste” but associated with “ too fatty” and “ bad quality” in the interview. The expected acceptability of processed pork, eggs and rabbit seemed to be governed by negative images of fatness or dryness and that of beef by a positive image of “ tenderness”, which related poorly with tasting experience.
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  • 94
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The documentation of the flavor and texture qualities of products is critical in product development and product improvement. Descriptive analysis uses highly trained panels to generate these unique analytical sensory profiles. The recruitment of qualified and motivated panelists is essential to a descriptive analysis program and the product development efforts the panel documents. Previous recruiting methods have proven ineffective in the current job market; this paper demonstrates a novel approach that the Pillsbury Co. took in the recruitment of panelists. Advertising was specifically targeted to attract viable candidates. Candidates were also presented with increased opportunities to gain information about the panelist positions. These methods were successful in recruiting high performance panelists.
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  • 95
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This study was designed to assess taste threshold and investigate the effect of age, dental problems, health disorders/diseases and multiple medications on the distortion of taste and to determine if the loss of taste increases with age. One hundred seven elderly from rural congregate feeding sites and senior centers in Northern Alabama volunteered to participate in this study. Water solutions of varying concentrations for sweet, salty, sour, and bitter were prepared to determine recognition thresholds and test the effect of other factors on the ability to taste. A questionnaire was administered to each elderly volunteer to assess overall health. Results indicated that there was no significant age difference for the basic taste sensations, except for sweetness. Gender, dental problems, health disorders, diseases and multiple uses of medications did not significantly affect taste threshold. The basic was a decrease in taste threshold independent of any extraneous factors.
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  • 96
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    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Product testing with multiple matched samples is often encountered. If the response for each sample is binary, the test involves comparison of multiple proportions of dependent samples. In the paper, a test statistic due to Bennett (1967, 1968) is discussed and extended to the replicated testing situation. An adjusted Bennett's statistic is proposed based on the Dirichlet-multinomial distribution. The conventional and adjusted Bennett's statistics are illustrated by a numerical example in product testing.
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  • 97
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 17 (2002), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This research note shows the reaction of children (ages 8-14) to candy colors in a computer-aided visual inspection task. Children like most of the single colors more than the two-color combinations. There are major differences in the acceptance patterns of the different stimuli by age, so that one cannot make blanket statements about acceptance across all age groups. The panelists of different ages show different scaling behaviors, with younger children showing slight polarizing towards using the top of the liking scale, and “ tweens” (ages 12–14) showing polarization towards the middle points of the liking scale.
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  • 98
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 16 (2001), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This research characterized the time-intensity (TI) profiles of monosodium glutamate (MSG), disodium 5′-inosinate (IMP), and disodium 5′-guanylate (GMP). Twenty subjects rated total taste intensity of single solutions of 2.5, 5 and 10 mM MSG, 0.63 and 2.5 mM IMP and GMP, and some of their mixtures, using the TI method. The profiles generated were atypical of other taste modalities. Time to maximum intensity waslong (16–20s), followed by a plateau at maximum intensity, and a persistent aftertaste (50–96s duration). Maximum intensities of the samples varied (p 〈 0.001), with mixtures of 10 and 5 mM MSG with 2.5 mM IMP or GMP yielding the highest intensities. Similar differences were found for total duration and area under the curve. These results indicate that flavor potentiators may increase total flavor during consumption. Synergism between flavor potentiators was demonstrated.
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  • 99
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 16 (2001), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Different goat cheeses from Chile were studied by Free-Choice Profile (FCP) analysis. Generalized Procrustes Analysis (GPA) applied to FCP data permitted differentiation between samples and informed on the attributes responsible for the observed differences. Appearance was a dominant factor in discriminating samples and to a lesser degree textural variables were also correlated with GPA dimensions. In acceptability the fresh cheeses were significantly preferred over the ripened ones.
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 16 (2001), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Although expert assessment of food characteristics is recognized as a key step in product development, the use of consumer based measurements is sometimes recommended as an equivalent to the experts. From cognitive psychology, support of the role of perceptual learning is found in some instances, although this could not be relevant in others. To address this point performance analysis of experts and untrained panelists in cheese texture evaluation was carried out. Neither the untrained panelists nor the experts were familiar with either the scales or the kind of cheese. The same Cheddar cheese was given to 44 untrained subjects in three trials to assess hardness. The results showed that their judgment has a 29% average random error variance; the interrater reliability being low. The same experiment gave a random error variance of 2% for three highly skilled judges (experts). The difference in variance was linked to training. Untrained panelists also showed an adaptation error. Nevertheless, there was no significant difference between the average ratings of both groups, whether untrained or experts.
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