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  • Articles  (229)
  • Articles: DFG German National Licenses  (229)
  • Blackwell Publishing Ltd  (229)
  • Oxford University Press
  • 2020-2024
  • 1990-1994  (136)
  • 1985-1989  (93)
  • Chemistry and Pharmacology  (229)
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 5 (1990), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper illustrates an application of principal component analysis (PCA), partial least squares regression (PLS) and generalized procrustes analysis (GPA) to evaluate the ability of a trained group of assessors to perceive rancidity in foods.PCA and regression PLS were utilized to determine to which extent sensory attributes capture the information perceived by a trained sensory panel, and if this can be developed into a predictive model for rancidity in sausages.The data were submitted to a GPA to obtain a map of the products for each subject as compared with a consensus products map. Assessors plots for the sensory attributes were also obtained to reveal the dissimilarities between panelists and to explore clustering.
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 5 (1990), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Understanding the tactile feel of paper, nonwoven, and woven products requires a valid and reliable sensory evaluation method which discriminates and describes handfeel properties. The Handfeel Spectrum Descriptive Analysis method separates the sensory tactile properties of paper and fabrics into clearly defined characteristics that are based on sound physical properties. The benefit of using a trained descriptive sensory panel is that resulting analytical sensory data allow full documentation of a sample's sensory tactile properties that can be related to consumer responses and instrumental physical tests. This benefit derives from strict protocols for manipulation and the use of precisely defined terms to discriminate and describe the qualitative properties (characteristics) and their relative intensities (strength) in each product. This paper discusses in detail the protocols for (1) sample preparation, presentation, and handling during evaluation, (2) the definition and scale range for each sensory attribute/characteristic and (3) the application of these data to address business and technical situations with consumer products.
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  • 3
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    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 5 (1990), 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 investigation was to compare two sampling methods (expectoration and ingestion) of single component water solutions (sweet—5% sucrose, sour—0.006% citric acid, bitter—0.027% caffeine, salty—0.325% sodium chloride) using time-intensity (T-I) evaluations. Analysis of variance was used to evaluate significant differences. There were subject inconsistencies for the recording times (RT) of sucrose, caffeine and sodium chloride tastes among the sampling methods. No panel differences were found for citric acid duration (RT) between ingested or expectorated samples. Individual contradictions for amplitude sucrose and sodium chloride mixtures were apparent however, the panel demonstrated no differences among the amplitude means between the sampling methods for citric acid and caffeine solutions. Aftertastes for ingested sodium chloride solutions were significantly (P 〈 0.01) greater than for expectorated samples whereas sampling techniques had no effect upon caffeine aftertastes. Individual contradictions were apparent for citric acid and sucrose aftertastes between the sampling methods.
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  • 4
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    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1990), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The umami taste concept for a group of judges was measured by a categorization task with food stimuli. The concept was defined to the judges in two ways: first, by verbal description and second, by presenting the judges with standard stimuli: broths made from kombu, katsuobushi and shiitake. The concepts obtained in both instances were close, both for Japanese and American judges. Thus, the umami term could be communicated relatively accurately in sales and marketing without the need for physical standards.
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  • 5
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    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1990), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Black pepper powder (60 mesh) was stored in consumer unit packs of 100g capacity in low density polyethylene (LDPE) films of 100, 300, and 500 gauge at 27°C and 65% RH. Analyses for sensory quality (odor and flavor), volatile oil, oleoresin, piperine content, and TLC were carried out at 15, 30, 45 and 80 days of storage. Significant loss of “top notes”, volatile oil, and hydrocarbons were seen after 15 days of storage itself while the “basic notes” and oxygenated compounds were retained up to 45 days. There was no loss of piperine up to the end of the study. The black pepper powder was not fit for table use after 15 days, though it could be used for other culinary purposes up to 80 days of storage.
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  • 6
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    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1990), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Graphics programs were developed using SAS® (Statistical Analysis System) for descriptive analysis sensory data. The routines allow the operator to generate publication quality polar coordinate plots (“cobweb” diagrams), and principal component plots from simple data files.
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  • 7
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    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1990), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Continuous measurement of degree of liking for chocolate milk varying in milkfat (0–36%) showed significant fluctuations over the 80 s test period. For 17 judges, samples with intermediate fat levels received maximum liking 20–30 s after placement in the mouth then declined to neutral (neither like nor dislike). The nonfat sample gave a flat, neutral response across time while the 36% fat sample was initially neutral, reached maximum dislike at approximately 20 s then gradually returned to neutral. For 5 judges, increasing degree of liking was expressed for increasing fat levels. For both groups, maximum and minimum time-intensity (T-I) measurements correlated significantly with results from conventional hedonic scaling on a 20-cm line. Degree of liking was unaffected by swallowing or expectorating samples by either T-I or scaling. Thus, similar to perceived intensity, hedonic responses are not static, but show systematic changes during tasting, i.e., from the time the sample is placed into the mouth, through expectoration (or swallowing) until a steady (usually neutral) state is reached.
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  • 8
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1990), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Flavor cannot be measured directly by instruments, it is an interaction of consumer and product. A gas chromatogram, even with 250 peaks on it, does not say anything about the flavor, only about the volatiles. In some cases a character impact compound might be present, in a second group of products a small number of compounds may be responsible for the majority of the flavor, while a third class contains more complex foods, which have generally been processed in some way. A range of methods has been, more or less, successfully used to try to link composition data to flavor data, including the calculation of odor units, fractionation of chromatographic effluent, “nasal appraisal” of chromatographic effluent, and a range of multivariate statistical procedures. However, defects in understanding of the mechanism of operation of the chemical senses has limited the success which has been achieved.
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  • 9
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Using a model system of 3mM NaCl and purified water, predictions were made for subjects’ability to discriminate the odd sample in a set of nine triadic tasting sequences associated with the triangle test. With such individual triads rather than triangular testing protocols which involve more than one triad, it was found necessary to modify the regular Sequential Sensitivity Analysis. The modification required a consideration of sensory adaptation effects caused by repeated tasting of the same stimulus in some of the sequences. Further confirmation was also obtained for the order of magnitude of signal strengths of water and NaCl stimuli tasted after water or NaCl prerinses.
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  • 10
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The efficiencies of incomplete block designs were investigated by comparing two hundred and twenty eight analyses from eleven trials using hedonic scales with corresponding randomized complete block analyses. Of the ten explanatory factors examined, only the panelist, the product type, the number of samples per session and the average score of the data had an effect on the efficiency of incomplete block designs. The effect of product type was attributed to influences of produce consumed outside the trial, and the effect of the data mean reflected decreased conscientiousness with products the panelists disliked. With three and four samples per session, incomplete block designs were 31 % and 2 % more efficient, respectively, than randomized complete block designs. When five or more samples were tested, the incomplete block designs were markedly less efficient. The practical implications of all these effects on experimental design are discussed.
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  • 11
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    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Aroma properties of twenty-three branched-chain, odd-numbered, or unsaturated fatty acids which had each been dispersed in acidic aqueous media (pH 2.0) were evaluated. Aroma threshold values were determined using approximately 95 judges for assessing the presence of aromas over dilutions of each fatty acid. Qualitative aroma threshold values for individual fatty acids ranged from 0.006 to 82.4 ppm in the acidic solutions, and 4-ethyloctanoic acid exhibited the lowest threshold of the group tested. Qualitative aroma assessments of dilutions of each fatty acid showed a wide range of unique aroma properties. Fatty acids exhibiting branching at the 4-position had goaty/muttony/sheepy aroma notes as did other fatty acids containing 8-carbon chain structures. Cheese-like aromas were associated with the shorter branched-chain fatty acids.
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  • 12
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Extrusion Technology for the Food Industry.
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  • 13
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The problem of balancing out the effect of order of presentation and the carryover effect of a preceding sample over a series of presentations of the same set of samples is addressed. A series of designs developed by Williams (1949) are used. The method of calculation is given. Tables containing about 50 consumers of each design for presenting from 4 through to 16 samples are given.
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  • 14
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Two experiments were conducted. In the first, 25 untrained subjects judged the hardness and chewiness of three different food samples following either 0, 60, 120, or 180 s of adaptive chewing on an experimental gum compound. No effect of the adaptive chewing was found, in spite of observable and self-reported masticatory fatigue induced by the experimental procedures. These data fail to support the prevalent use of procedural limits on the number and temporal spacing of samples in sensory texture studies. In the second experiment, six groups of subjects (n = 107) judged the hardness and chewiness of two series of food samples that varied in physical size (volume). The groups differed in the degree to which cues about the true size differences were made available. Results showed both hardness and chewiness judgments to increase as a function of sample size, independently of subject awareness of the size differences. These data support the use of procedural controls on sample size, but fail to provide evidence of a size constancy phenomenon. A rheological explanation is proposed to account for the observed sensory effect.
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  • 15
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Single-point sensory response measurement techniques such as magnitude estimation and category scaling only contain a limited amount of information. Time-intensity (T-I) data collection techniques provide much more information, addressing rate-related and duration aspects as well as intensity quantification. A theoretical analysis and comparison of single-point and T-I responses is presented from an informational (Shannon) entropy content viewpoint. The analysis is based on a hypothetical T-I response curve and a hypothetical series of single-point measurements attempting to approximate the T-I curve. Assuming a 15 s sensory event the associated T-I response of a single parameter is shown to contain a significantly greater amount of potential information storage capacity relative to the single-point or a small series of single-point measurements attempting to generate temporal behavior. Theoretically, the T-I response also displays greater quantities of a parameter called information density. Finally, it may be hypothesized that T-I techniques can be shown to be more efficient in terms of rate of information acquisition.
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  • 16
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Perceived intensity of bitterness of caffeine (0.5 - 1.6 g/100 mL) and of quinine HCI (0.5 - 1.6 g/L) added to hot cocoa gave similar response distributions with concentration by category scales (CS) and magnitude estimation (ME). Using caffeine additives, CS and graphic analogue scales (GS) gave similar bitterness response functions. Parabolic functions provided the best fit between concentration and ratings for CS, GS and ME. The data demonstrated no difference for ME of bitterness intensity between free or fixed moduli. Hedonic responses also were not modified by whether the modulus was free or fixed, however, greater ME values were ascribed to lower concentrations in the series when the reference was 4 g/L than when it was 2 g/L caffeine. CS intensity response distributions were similar between a series with a larger number of low levels versus a series with a larger number of high levels across the same concentration range. The results indicate that ME may be inappropriate for scaling of degree of liking, independent of type of modulus.
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  • 17
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: It is frequently impossible to meet the assumptions underlying the statistical approach to classification of food products by a sensory panel. To find an alternative, we have investigated the applicability of the fuzzy set theory. Within a fuzzy set framework it is acceptable that a product belongs to several classes simultaneously and no assumptions regarding the distribution of sensory properties for a product class are made. Fuzzy classification models can be constructed from a set of training objects by linking the soft class labels to the sensory attributes applying an inference procedure based on fuzzy logic. A number of fuzzy inference procedures has been evaluated using a number of attribute sets. A satisfactory classification has been found using a very simple implication rule and a set of three attributes.
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  • 18
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 4 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Book Reviews in this Article:Quality Assurance of Food Ingredients, Processing and Distribution.Recent Advances in Chemistry and Technology of Fats and Oils.
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  • 19
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 3 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The total intensity, sweetness, and acidity of sucrose/citric acid mixtures were judged by two types of taste panel: experienced assessors, most of whom had had many years of experience in sensory evaluation; and novice assessors, none of whom had previously taken part in a taste experiment. In other respects the experimental conditions remained almost constant. There was good correspondence between the two panels, particularly for judgments of total intensity, indicating that novice and experienced assessors evaluate taste mixtures in the same way. However, there was also an indication that experience on sensory panels may attenuate taste suppression, the suppression of acidity by sweetness being less pronounced for the experienced panel than for the novice panel. The implications for mixture perception are noted.
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  • 20
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 3 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Paired comparison and triangle tests were used to contrast the effects of ingestion and expectoration in two distinct systems: added salt in kidney beans and nonfat milk with added milkfat. Probit analysis was used to determine panel difference thresholds. Analysis of variance was used to evaluate significant differences between the methods of sampling and for effects of fatigue due to ingestion of the sample. No significant differences between the two methods of sampling were found for either thresholds or fatigue effects.
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  • 21
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 3 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The concept of free-choice profiling allows untrained assessors to participate in sensory profiling. However, it is sometimes the case that such individuals are unable to describe what they perceive when the samples are presented in the isolation of the sensory testing booths. This paper reports an experiment to compare the usual free-choice profile procedure, with a more structured approach based on Kelly's repertory grid method. Generalized Procrustes analysis was used to analyse the data. The sample configurations obtained from both approaches were very similar, as were the interpretations of the main perceptual dimensions.
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  • 22
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 3 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A novel experimental method was developed which allows the determination of the threshold concentration of sucrose by use of a linear sucrose gradient in water. With this method a continuous tasting of the test-liquid is possible. A panel of 15 persons experienced in taste-testing was used. Three gradients of different steepness were applied: 0 to 1.5% (w/w) sucrose in 2 min (I), 3 min (II) and 4 min (III). The results of the new method were compared with those of the standard method (DIN). With gradients I and II we found values which were significantly higher than those of the standard method (I: 0.49% (w/w); II: 0.46% (w/w); DIN: 0.31% (w/w)), whereas with gradient III the same threshold value was found as with the DIN-Method (III: 0.32% (w/w)).
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  • 23
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 3 (1989), 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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  • 24
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 3 (1989), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Single-point intensity scaling and time-intensity methods were used to record oral irritation from solutions of 2 ppm capsaicin, capsaicin with added sucrose (0.04M), NaCl (0.3M), citric acid (0.01M) or xanthan gum (0.2%). Only sucrose depressed mouth-burn, both in magnitude and duration. The viscosity imparted by xanthan retarded perception of mouth-burn but did not effect its duration. While single-point scaling averaged perceived intensity across time, time-intensity provided much more information by displaying perception from onset to decay. Eaters and non-eaters of chili peppers did not differ in their perception of mouth-burn.
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  • 25
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 2 (1987), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A standardized descriptive language for evaluating the flavor of pond-raised channel catfish has been developed. These terms should help researchers determine the causes of off-flavors in catfish and evaluate potential solutions to the problem. The fish processing industry should also be able to apply these terms in quality control and new product development.
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  • 26
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 2 (1987), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An objective procedure for descriptive quality analysis of mutton is described. The sensory attributes of tenderness/toughness, succulence, and aroma, and descriptors for five identifiable levels of each attribute were obtained based on panel participation and consensus. Such a participation provided adequate training to the panel for uniform understanding of the descriptors and the quality stages due to age and conditioning. The screening, selection, training, and performance monitoring of the panel has been described in detail. A scale with emphasis on optimum level in each quality attribute has been proposed in place of the usual unipolar general intensity scales. The procedure developed was used to study the effect of stunning and conditioning of mutton from Bannur sheep. A regression of tenderness/toughness rating on Warner-Bratzler shear, employing a horizontal blade in place of traditional conical blade (WBH, kg. cm−2) has been developed (r = 0.94) and a 95% range of 4.5 to 6.1 kg.cm−2 was found as optimally tender mutton as decided by the panel.
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  • 27
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 2 (1987), 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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  • 28
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    Journal of sensory studies 1 (1986), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: When training a sensory evaluation panel, reference standards play an important role in developing appropriate terminology, establishing intensity ranges and showing the action of an ingredient. In addition, use of reference standards reduces the amount of training time while providing documentation for terminology. Product characteristics can be demonstrated through reference standards for application in plant quality assurance programs as well as for project planning in new product development, product maintenance (i.e., shelf-life), product improvement and cost reduction programs.
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  • 29
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 1 (1986), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An odor profiling procedure was developed based on the ASTM odor profiling method. This modified procedure involved using approximately twenty panelists. Panel sessions and data collection were controlled by computer. The results obtained by this panel compared favorably to results obtained by the ASTM panel for which 150 panelists evaluated each compound, indicating that a small panel can be used to produce replicable results. Statistical methods of finding similarities and dissimilarities among compounds using profile data are discussed and compared to results from a multidimensional scaling (MDS) study in which degrees of differences among compounds were judged directly. These results indicate that profile data can be used to define and map the degree of similarity/dissimilarity among compounds, as well as to define the sensory dimensions on which these compounds differ. The use of factor analysis to study the underlying sensory dimensions of the odor space is also discussed. It is hoped that this type of research will lead to a better understanding of the underlying dimensions used to describe odorants.
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  • 30
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    Journal of sensory studies 1 (1986), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Component and factor analysis were compared as means of reducing scaled values for 10 descriptors of tea to two dimensions so that relations among the attributes could be visualized. The association diagrams yielded by the two methods were generally similar, and there were significant differences between the diagrams for English Breakfast, an 80:20 blend of English Breakfast and Sencha teas, Ceylon and Darjeeling teas. Bartlett's test for equality ofvariance-covariance matrices was significant. When tea was equivalently sweetened with sucrose and with saccharin, the association diagrams were different. Preference and sweetness were highly correlated with each other and they had high com-munality with the other attributes when saccharin was the sweetening agent. When sucrose was the agent, sweetness still had high communality with the other attributes, but preference did not, indicating preference was the result of interplay of all the attributes rather than a dominant one. The correlation matrices were not significantly at p= 0.05, but they were at 0.10.
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  • 31
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 1 (1986), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The relative sensitivities of four scaling methods were assessed in central location tests with untrained judges. The scales included category scales, line scales, magnitude estimation, and a hybrid of the line and category scales. Approximate parity was observed among category scales, line scales and the hybrid scale in their ability to differentiate small physical differences. Magnitude estimation was used as efficiently as the other methods by a college population, but less efficiently by a heterogeneous sample of consumers. Judges used the scales with greater accuracy as they became familiar with the range of products to be judged. In spite of relatively small physical differences, subjects used wide ranges of the scales, supporting the view that rating scales are relative, not absolute, measuring instruments.
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  • 32
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 1 (1986), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Books review in this article: Role of Chemistry in the Quality of Processed Foods. Owen R. Fennema, Wei-Hsien Chang and Cheng-Yi Lii, eds.
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  • 33
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    Journal of sensory studies 1 (1986), S. 0 
    ISSN: 1745-459X
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 34
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    Journal of sensory studies 1 (1986), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Data sets from three studies were examined to determine the effects of brand identification and package design on consumer responses during product evaluation. In these studies, consumers evaluated products with or without brand identification, compared products in standardized conditions, and compared products in different package designs with different or identical product contents. Measurement of consumer responses for all studies was based on 9-point hedonic scale. The results of the study showed that consumers were less critical in their evaluation when the samples being assessed were identified by brand names. Brand identification and package design, when not concealed in the comparison of product contents, resulted in consumer response bias. Also, the popularity of a brand influenced consumer's perception of products.
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  • 35
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    Journal of sensory studies 1 (1986), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A collaborative study of twenty-three laboratories was conducted to compare the relative effectiveness of three scales: two forms of magnitude estimation scaling and one form of a category scale in the measurement of hedonic response to a controlled stimulus. Responses from 553 individual judges show that all scales yield hedonic measurements that are very similar in both direction and magnitude of difference between the stimuli. No scale showed any clear superiority in reliability, precision, or discrimination. Selection of a scale must be based on considerations other than the simple form of response.
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  • 36
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    Journal of sensory studies 9 (1994), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Computerized panel training with graphic feedback showed significant feedback effects for magnitude estimation judgments of sweet and sour taste intensities. Context effects still existed but were reduced after training with or without feedback for both line scale and magnitude estimation scaling methods. Following a 2-week period of inactivity, context effects tended to increase. These results suggest implications for current descriptive panel training and maintenance activities.
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  • 37
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Developing peanut breeding strategies for roasted peanut flavor improvement requires that roasting be to an optimum and effects of negative environmental exposure be to a minimum. In practice it is difficult to achieve these conditions. However, statistical adjustments are possible. To ascertain the proper adjustments, surface response equations were determined relating roast color and fruity attribute scores to roasted peanut attribute score. Fruity attribute had a depressing effect on roasted peanut attribute score. Similarly, underroasting as well as overroasting led to reduced roasted peanut attribute scores. Adjusting for genotype and location had nonsignificant effects on mean optimal roast color or linear equation slope values of the fruity-roasted peanut relationship. With these findings a method for maximization of roasted peanut values was developed using a modified SAS routine. Although the capability to estimate the roasted peanut flavor of a sample with optimal roasting and environmental effects has several potential applications, our specific application is to evaluate parentage contribution to flavor enhancement or flavor reduction.
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  • 38
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    Journal of sensory studies 9 (1994), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Sensory terminology is very important in descriptive analysis and perceptions are greatly influenced by the language. Definitions can be very useful for specifying and describing a sensation. However, many sensory attributes are not easily defined and physical reference standards can contribute a great deal to smoothing language problems. They can be used to develop the proper descriptive language, to reduce the amount of time required to train the sensory subjects, and to calibrate the panel in the use of the intensity scale, all the while providing documentation of the sensory terminology.The Quantitative Flavor Profiling (QFP) technique was applied to evaluate flavored cheese analog, yoghurt and sweetened milk samples. Specific standardized flavor languages were developed for each product type and included reference standards for each sensory descriptor. The results of QFP were analyzed by principal component analysis.
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  • 39
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Results obtained in the determination of sensory thresholds with three different simplified methods were compared. The methods were: a modification of the ascending method of limits (1), one based on the method of the constant stimuli (2), and one based on the use of scales (3). The study was carried out on two sensorially simple systems, sucrose and aspartame aqueous solutions. The thresholds values for sucrose obtained by method 1 (1.41 g/L) and by method 2 (1.60 g/L) were similar and within the range obtained by method 3 (0.6–1.6 g/L). For aspartame the values obtained with methods 1 and 2 were also similar (0.004 and 0.005 g/L, respectively), but they were below the minimum value of the corresponding range (0.008–0.016 g/L) calculated with method 3. These results suggest that the sensory methods provoked less variability in thresholds values than other noncontrolled factors. The limitations and advantages of each method are discussed considering: experimental work, precision of results and practical validity.
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  • 40
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    Journal of sensory studies 9 (1994), S. 0 
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  • 41
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    Journal of sensory studies 9 (1994), S. 0 
    ISSN: 1745-459X
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In Free Choice Profiling (FCP) each individual panelist creates his own series of descriptors to describe the differences among a set of samples. This is in contrast to multidimensional scaling (MDS) where the panelists assess the similarities among the samples. The objective of this study was to compare the results obtained from two FCP panels (one composed of “sensory-savvy” persons and the other of “sensory-naive” individuals) with MDS results. Vanillin and four vanilla samples each originally at 3-fold, 10-fold and 20-fold concentration were evaluated. On average the sensory-savvy (SS) panelists did not use significantly more descriptors than the sensory-naive (SN) group. However, the terms used by the SS group were more likely to discriminate among the samples than the SN terms. Procrustes analysis indicated that the SN data did not have a true consensus space while the SS data did. The MDS data space was visually similar to the FCP space.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A well-trained panel is a valuable tool for describing and quantifying characteristics of a food product. This research was undertaken to study the effects of feedback during panel training. A computerized system was designed using the Macintosh computer to gather data and provide panelists with individualized instruction and immediate graphic feedback. Two levels of feedback (with or without) were delivered to the panelists over a 2-week training period. Feedback consisted of correct response for discrimination testing and a graph displaying means and deviations for scaled data.Results showed an expansion in the use of the line scale and an increase in precision across trials. No notable change in magnitude estimation sample scores was observed across feedback conditions; however, deviations were lower following feedback. Although exposure/practice alone provided similar changes, further differences were affected with graphic feedback. Results suggested individualized computer assisted instruction with graphic feedback may provide an efficient and effective tool to complement existing panel training techniques.
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  • 43
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    Journal of sensory studies 9 (1994), S. 0 
    ISSN: 1745-459X
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The purpose of this study was to compare how similar results are achieved by three different procedures of measuring liking for ice cream. Subjects (N=56) assessed their liking for three brands of vanilla ice cream on a 9-point scale in seven sessions within three weeks. The examined procedures were (1) tasting and rating all three brands simultaneously side-by-side within the same session, (2) rating each brand in separate sessions after ad libitum consumption and (3) tasting (without consumption) and rating each brand in separate sessions. The liking scores for brands differed significantly but the differences were small because all samples were well-liked. In all procedures, the ratings of liking differed clearly between those who ranked the brand first and those who ranked it second or third, even if there was a considerable number of tied first places. Correlations among the three different measurements of liking were relatively low for all brands of ice cream (r = 0.16 – 0.37). The most preferred brand for most respondents changed from one procedure to another. The perceived characteristics were close to ideal in all brands, and all three procedures gave similar mean results. The distance of mouthfeel, creaminess, sweetness, and vanilla aroma from ideal differed between those who liked the brand best and those who rated it second or third. These differences were larger in side-by-side and after consumption conditions compared to single sample presentation.
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    Journal of sensory studies 9 (1994), S. 0 
    ISSN: 1745-459X
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A simple nonmathematical introduction is given to Thurstonian modeling and its application to difference testing. The theoretical treatment explains differences in performance noted for various difference test protocols and the so-called paradox of discriminatory nondiscriminators, whereby a slight change in instructions to the judge can alter the proportion of tests performed correctly. From this, the assumptions in the use of binomial statistics for analyzing difference tests and their shortcomings, are discussed. New ideas on the generality of the paradox of discriminatory nondiscriminators are discussed, along with the effects of the cognitive strategy adopted by the judge during testing.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An important issue in consumer oriented studies is to measure how closely a specific product or perception matches the representation people have of it. We used a concept matching technique to assess the degree to which a variety of different cheeses matched subjects’ concepts of Cheddar cheese. Eighteen subjects made their judgments using their own past experiences with Cheddar cheeses. They made judgments in three separate conditions: only the odor, only the taste and texture and normal eating. This technique provided valid and reliable information on the extent to which the cheeses matched the subjects’ concept of Cheddar cheese. Agreement between classifications of cheeses based on taste and texture only and based on normal eating was high (R=0.90). Agreement between classifications based only on odor and those based on normal eating was weaker (R-0.59). Thus, the taste and texture of the cheeses were more useful than the odor for classifying cheeses as Cheddar.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Thirty French red wines, selected from the main regions of France, were chosen as objects for an expert panel to be trained in Descriptive Analysis. Seventeen attributes were chosen to describe the wines. Principal Component analysis showed a good separation of the wines among regions of origin. The results were verified by Analysis of Variance (ANOVA). Generalized Procrustes analysis was included to analyze the panelist performance, such as individual differences in attribute ratings.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The temporal irritant response was evaluated for six concentrations of capsaicin, cinnamaldehyde, andpiperine, using time-intensity (TI) methodology. TI curves were evaluated using six TI parameters: maximum intensity (Imax), time-to-maximum (Tmax), plateau time (Tplat), total time (Ttot), maximum rate of onset (Monset) and maximum rate of decay (Mdecay) of perception. Maximum intensity was used to evaluate the appropriateness of the Beidler taste equation, calculate the degree of affinity of the stimuli for the receptor (Kb), Gibbs free energy values, and the other TI parameter were used to quantify the adsorption desorptionprocesses. For cinnamaldehyde and capsaicin, correlation coefficients for the proposed Beidler taste model were 0.999, and 0.996, respectively. The large association constants (Kb) for cinnamaldehyde (25 M−1) and capsaicin (5.2 × 104 M−1), compared to taste compounds, were consistent with their steep psychophysical functions and their persistent aftertastes. Concentration dependencies of Tmax Tplat, Ttot, Monset and Mdecay, fit linear and semi-hyperbolic functions and were congruous with the proposed adsorption- desorption model for irritant perception.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: There are two approaches to modeling key relations among variables when one tests products. S-R or stimulus-response modeling assumes that the researcher controls the antecedent physical variables (such as ingredients or processing), and that these physical variables are the primary cause of product-to-product differences. R-R or response-response modeling assumes that the researcher can measure co-varying physical measures of a food, but may or may not have control (or even knowledge) of the antecedent physical variables that generate product differences. S-R modeling allows for true optimization, in terms of defining the operations needed to maximize an attribute (e.g., acceptance). R-R modeling allows only a guess as to what particular combination of physical measures would correspond to a maximum level of the attribute. Often S-R and R-R modeling and optimization are confused with each other, leading to incorrect conclusions.
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    Journal of sensory studies 9 (1994), S. 0 
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Liking rating data of 8 pigmeat products from 99 Australian females aged 25-45 was analyzed using MDPREF. A line scale extended past the anchor points, 100 mm long and anchored by the words ‘dislike extremely’ and ‘like extremely’ was used. Liking was judged on the product name alone, no products were actually tasted. MDPREF configures products and consumers so that individual preferences (or product order preference) can be obtained. The order of product preference from the rating scores and order of product preference from the MDPREF analysis for each consumer was matched. It was found that the preference order for each consumer from the MDPREF map matched the order shown by rating scores in about 25% of cases. MDPREF produced 17% of consumers who had no products in the correct position for the preference order. Only 1% of consumers had all eight product preferences in the correct order.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Evaluations of multiple products in a category proceed with two different, unstated objectives, and two distinct analytic approaches. The first objective is to “map” the category - viz., to put the products in a category onto some type of geometrical map with the property that products lying close to each other on the map share aspects in common. Researchers use mapping to identify which products compete with each other, as well as to discover whether or not there exist in the category unfilled “holes” that have promise. Researchers use modeling, in contrast, to identify the salient dimensions along which consumers differentiate products in the category. Modeling assumes that the researcher will create a relation between two or more attributes in the category. The analysis generates equations (or even only correlations) rather than maps. Mapping and modeling are complementary, yet often one approach is used to the exclusion of the other because of internal biases and points of view held by the researcher. This paper shows how the two are used, and how they can be integrated to create a more powerful analytic approach.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper proposes a statistical method for difference tests with repetitions. Classical methods for difference tests are based upon the binomial distribution, and are not concerned with the number of repetitions per judge. But when more than one replication of a difference test is required, judgements from different judges are more independent than replicates from the same judge; these two cannot be combined in the classical methods. In this paper, we propose another approach that takes into account two points: the number of repetitions per judge, and the differences within subjects. Two examples are presented to illustrate this approach.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: GRAPES computes individual and global analyses of variance for sensory profiling data, consisting of several sessions in which all the panelists gave scores to all the products for a number of attributes. The fitted model takes into account the session effect. GRAPES summarizes the results by means of graphical assessor scatterplots which allow to check and to compare panelist performances, such as the way of using scale, the reliability, the discrimination power and the agreement with the panel. In addition, GRAPES detects the outliers for each of these criterion. The usefulness of GRAPES for the panel leader will be demonstrated using texture and flavor profiling of 4 restructured steaks by 12 assessors for 15 attributes. The SAS® program GRAPES, available by e-mail from the author, requires the SAS/BASE®, SAS/STAT®, SAS/GRAPH® and SAS/IML® softwares.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Cheddar cheese (three trials) was made from split lots of curd, salted with NaCl or mixtures of NaCl/KCl and ripened at 3 ± 1C. Preferences for cheese, as determined by consumer panels, were significantly (P 〈 0.05) affected by flavor and order of presentation to panelists but not (P 〉 0.05) by age of cheese. In the first order of presentation, cheese made with NaCl was preferred over those made with NaCl/KCl, whereas in the second order of presentation cheese made with 1.52% NaCl/KCl (2:1) was preferred. In the third order of presentation, cheese made with 1.72% NaCl (rather than 1.5%) was preferred. Overall, mean scores were higher for cheeses made with NaCl than with NaCl/KCl. However, the score of cheese made with ca. 1.5% NaCl/KCl was not significantly (P 〉 0.05) different from that of cheese made with ca. 1.5% NaCl. Cheese made with ca. 1.5% NaCl/KCl (2:1) was consistently preferred over cheeses containing more KCl.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The responses of Australians and Japanese to the sweetness of 36 products from 6 food categories, namely beverages, biscuits, cereals, chocolates, fruit juices and jams were compared using ‘sweetness liking’, ‘sweetness strength’ and ‘sweetness just right’ scales. Similar responses were obtained for the two panels with jams and fruit juices, but considerable disagreement particularly as regards ‘sweetness liking’ occurred with beverages, biscuits and chocolates where there was evidence that familiarity with the products influenced sweetness responses. Where it was possible to compare the ‘sweetness strength’ of similar products from each country, e.g., strawberry jam, there were no obvious differences. The sweetness of products from both countries covered a wide range of levels, and liking for sweetness levels appeared to be dependent on the context of the product and familiarity with the product. Prediction of liking for the sweetness level of a particular product does not appear possible and it is clear that with a significant number of products from either country that modification of sweetness levels would be necessary for acceptance by the other culture.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A series of yoghurts was produced by using ten commercially available starter cultures under laboratory conditions and subjected to descriptive sensory analysis. The score sheet was developed by a ten member panel and included eight sensory categories. Additionally, a hedonic scale was used for evaluating acceptability impression. Statistical analysis showed good performance of both individual subjects and the whole panel. Furthermore, homogeneity between replicate assessments was observed. Significant differences between products were found in each sensory category except texture (gel firmness). Correlation analysis showed significant interrelations between some sensory continua. By using multiple regression analysis hedonic scores were found to be mainly determined by ‘Flavor’ and ‘Ropiness’ showing positive and negative weightings, respectively.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Four combinations of cookie and juice were presented to 42 subjects for ratings of pleasantness of the items and their combinations (Experiment 1). Pleasantness of juice contributed to the pleasantness of a combination more than that of cookie (multiple regression analysis). In Experiment 2, subjects (N=41) rated each combination after ad libitum consumption in four separate sessions. Pleasantness of a cookie contributed more to the pleasantness of a combination than that of juice, and the average R2 obtained in multiple regression analysis was higher than in Experiment 1, suggesting that ratings after ad libitum consumption are more reliable. Pleasantness ratings explained ad libitum consumption of an item up to 23%, but perceived hunger and thirst, and consumption of the other item were at least equally good predictors. It is concluded that the pleasantness is only one among the multiple factors affecting amounts consumed in laboratory conditions.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Two taste sensitivity measures (detection threshold and time-intensity [T/I]) were applied to evaluate bitter taste sensitivity of caffeine in both caffeine nonusers (n = 12) and users (n=12, caffeine consumption level; 〉 300mg/day). Taste thresholds of caffeine were significantly different between nonusers and users in two test sessions (p 〈 0.01 in first and p 〈 0.05 in second). In T/I measures, only the difference in peak height was observed between the two groups in one of two test sessions. The other two measures, half width and area of T/I curves showed no significant difference.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This study examined how people compare the hardness of different materials. Simple models with either elastic or plastic behavior were prepared and controlled mechanically. Six elastomers were compared to 29 plastic dental waxes of different hardness. For each elastic sample, a psychophysical staircase method was used to determine its perceived hardness in comparison to the plastic samples. Single bites were performed and the forces were recorded by a small load-cell placed between the sample and the teeth. Nine subjects. free of dental pathology, participated in this study. Subjects were able to match samples of both materials with a specific stress ratio which depended on the hardness of the elastic samples. Results indicated that people do not use the same sensory cues and, in this case, no clear role of the bite force was established.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The objective of this study was to compare the preferences and performance of three groups of judges, which represented different types and levels of training. Three groups of judges (descriptive analysis judges, ADSA dairy judges and untrained) rated their liking and the sensory attributes of five Cheddar cheeses. The trained panels rated two cheeses relatively lower in liking than did the untrained panel but otherwise generally agreed with the liking ratings of the untrained judges. The trained judges tended to find larger differences in liking among the cheeses than the untrained panel. Training did not improve the agreement among judges on the liking ratings assigned to the cheeses. The trained judges rated the cheeses less intense for most all of the attributes. The three panels disagreed on the relative size and direction of differences in intensity for most all of the attributes. The trained panels did not typically find larger differences among the cheeses in the intensity of the attributes than the untrained panel. Training improved agreement among panel members on the attribute ratings. The attributes of the dairy judges were less intercorrelated.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Descriptive analysis panelists create, through training, a consensus language to describe perceived differences among samples. If DA gives reliable, objective descriptions of samples, it would be expected that data obtained from independently trained panels be consistent. Two DA panels were trained independently using the same samples. Vanillin and four vanilla samples each at 3-fold, 10-fold and 20-fold concentration were evaluated. Panel J used 14 terms to describe the vanillas and panel K used 16 terms. Eleven and thirteen terms, respectively, significantly discriminated among the samples. Principal component analyses (PCAs) for the two panels were visually similar. Both separated vanillin, Bourbon, Bourbon Processed Bali, Indonesian and Indonesian Non-smoky vanillas across the first PC. Procrustes analysis of the two spaces had a 0.80 fit value. Both the PCAs and the Procrustes analysis indicated considerable overlap of similar descriptive terms. Thus it appears that DA does give reliable consistent results across independently trained panels.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Odor thresholds in the headspace over aqueous solutions of diacetyl (butane-2,3-dione) were measured in quadruplicate by a forced-choice procedure in 53 individuals. Mean individual thresholds varied over a factor of 256, with the group average at .005 μg/ml. Thresholds showed a modest negative correlation with suprathreshold intensity ratings. Intensity ratings were distributed bimodally, consistent with the existence of insensitive and sensitive groups and suggesting the possibility of a specific anosmia for this compound.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The relationship between perception of tenderness and chewing activity was explored using the Time-Intensity measurement of perception and electromyographic measurements of masseter muscle movement. Semitendinosus muscles from eight treatments of forage fed beef were evaluated by nine individuals. The Time-Intensity parameters of Area Under the Curve and Decrease Area were the most useful for treatment separation based on tenderness. Information was obtained from the electromyogram regarding the number of chews, time to chew and mastication rate. However, more work with EMG measurements is required to accurately study the effect of masticatory patterns on tenderness perception.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Graphs useful in exploratory data analysis for checking assumptions and evaluating treatment, sequence, and period effects in a linear model from a crossover design are discussed. In particular, a two-period, two-treatment crossover design of a food sensory study is used to illustrate the applications of these graphs.
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  • 65
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 66
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper presents a general protocol for the sensory texture profiling of ice cream using eleven descriptors. Four ice cream bases, all containing 10% butter fat, were used in the profiling experiments. The composition of the bases was varied to create differences in softness, cold sensation and toughness. In addition, three sources of error were investigated: temperature, manner of serving and order of presentation. The importance of each type of error was determined by ANOVA techniques. Texture variables (descriptors) are influenced not only by the composition of an ice cream base, but also by the temperature of the ice cream during evaluation. When good standard procedures are used to scoop samples and to present them to panelists, sensory evaluations need not suffer from the other two sources of error examined.
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  • 67
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper is about detection of individual differences among assessors in sensory profiling. A discussion of different types of such differences are given and a graphical tool that can be used for detection of some of them is presented. It is also discussed how this tool, the so called Eggshell plot, can be used in practice and how it is related to the different types of individual differences. The theory is illustrated by two examples from sensory profiling, one from analysis of sausages and one from analysis of cheese.
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The quality determining factors of extruded products are affected by the temperature, shear and pressure generated by any input to the extruder during the short residence time (〈 120s). Although the relationship of process history to measurable product qualities has been established, sensory qualities have not been well correlated to these process responses. Sensory attributes of extruded corn meal products were investigated and correlated to measured physical properties in this study. Corn meal was extruded in a twin screw extruder (Baker Perkins MPF 50/25; LD ratio 15:1) with step increases in screw speed from 200-400 rpm, and moisture from 16-22%. Principal component analysis (PCA) of main factors from sensory color, crispness, and adhesiveness was correlated to process torque, pressure and temperature. Spatial distribution of process response and product attributes showed crispness to be dependent on extrusion temperature. Porosity and adhesiveness were not correlated to any measured process response. PCA analysis identified significant differences in the effects of moisture and screw speed input to the extruder on product properties.
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  • 69
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    Journal of sensory studies 9 (1994), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 70
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Single product scaling and relative-to-reference scaling were compared on the basis of numbers of significant differences among chocolate milks and among vanilla yogurts using both trained and untrained panels. The study involved 920 comparisons among product means with appearance, flavor and mouthfeel attributes. Although there were a greater number of significant t-tests when the relative-to-reference scales were used by both trained and untrained panels, the differences between scale types were minor. Panels showed no advantage with the type of scale they used first. The two methods may be used with equal efficiency for sensory evaluations.
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  • 71
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Consumers differ dramatically in their sensory preferences for products. This paper assesses the relative importance of appearance, taste/flavor and texture as characteristics that drive acceptance for a complex pie product. The paper classifies consumers as being driven by one or more sensory attributes in their judgment of product quality. To do so, each consumer's liking rating is regressed against each separate attribute liking. The coefficient (M) of the linear equation “Overall Liking = M (Attribute Liking) + B″ measures the relative importance of the sensory attribute as a driver of overall quality.
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  • 72
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Emulsified turkey sausages (ETS) were prepared using varying concentrations of sodium chloride (NaCl; 1.5 to 2.0%), sodium tripolyphosphate (STPP, 0 to 0.5%), and sodium acid pyrophosphate (SAPP, 0 to 0.25%). The sensory characteristics (response variables) of saltiness, soapiness, and texture were evaluated using a trained taste panel. Response surface methodology was used to design and analyze this study. Over the levels of STPP and SAPP, saltiness increased as levels of NaCl were increased. When STPP and SAPP were evaluated in combination with NaCl, saltiness increased slightly as levels of STPP were increased; and saltiness decreased as levels of SAPP were decreased. Soapiness increased at low levels of NaCl (1.5%) as STPP increased. Texture firmness decreased as SAPP increased and STPP decreased at low levels of NaCl (1.5%). Results suggest that sensory perceptions in ETS products are a combination of NaCl, SAPP, and STPP mixtures.
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  • 73
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The objectives of this study were to determine the distribution of the sensory panelists’ ability to detect differences and to improve the triangle test by minimizing unnecessary guessing. The triangle test was modified to include the use of economic incentives through which panelists voluntarily revealed their ability to detect differences. Panelists were asked to estimate their ability to detect differences and the probability of identifying the odd sample in a triangle test. They were then organized into three ability groups according to their responses. Double triangle tests, followed by triangle tests with economic incentives, were used to evaluate a cereal product and a beverage. The ability to detect differences was modeled as a probability, and the distribution of panelists was estimated. The economic incentives test was more effective when used with the beverage in which differences were less difficult to detect. We found that the economic incentive test discouraged the panelists from guessing unnecessarily, thus increasing the motivation of the panelists to detect differences, and allowing researchers to determine the distribution of discrimination ability.
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Perceived bitterness in drinks is known to fade slowly over time. Time-Intensity curves are a means of studying this fading process. K subjects record the perceived bitterness intensity by moving a slider on a monitor using a mouse. Usually average TI-curves are calculated to give a representation of the TI-curve for one particular object. The problem is that there often are large individual differences, so the average TI-curve is not always a good representation. An alternative is to perform a Principal Component Analysis on the matrices of objects by individual TI-curves for each object. The resulting, so-called, Principal Time Intensity Curves (PTIC's) are better representations than the average curves. Often the PTIC's for the different products are hard to distinguish. In this case a noncentered PCA of the matrix with curves gives results which show more differences between the products.
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  • 75
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Consumer test subjects were split into four groups: (1) Rewarded — told they would receive payment; (2) Unrewarded — told they would not receive payment; (3) Hungry — told not to eat before the test; and (4) Pre-fed — told to eat a meal before the test. Hedonic responses for four breaded fish samples were collected. The test design was then repeated using microwave popcorn as stimuli. Rewarded subjects and hungry subjects rated samples higher than did either the unrewarded subjects or the pre-fed subjects. The responses of both the rewarded and the hungry subjects indicated no hedonic differences between samples; but among the unrewarded and the pre-fed subjects, significant differences between samples were found. Results present a dilemma for those experimenters using acceptance ratings by consumers to guide product development. This paper discusses the issue of whether these, and other unresolved factors, need to be controlled when conducting consumer tests.
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  • 76
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Difference testing methods are extensively used in a variety of applications from small sensory evaluation tests to large scale consumer tests. A central issue in the use of these tests is their statistical power, or the probability that if a specified difference exists it will be demonstrated as a significant difference in a difference test. A general equation for the power of any discrimination method is given. A general equation for the sample size required to meet Type I and Type II error specifications is also given. Sample size tables for the 2-alternative forced choice (2-AFC), 3-AFC, the duo-trio and the triangular methods are given. Tables of the psychometric functions for the 2-AFC, 3-AFC, triangular and duo-trio methods are also given.
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The objective of this research was to examine some considerations arising from incorporating tasting into a conjoint analysis procedure studying the effects of taste, brand, price and health claim on the buying intent for strawberry yogurt. Specifically, the considerations were: (1) whether people could remember the sensory qualities of the products tasted well enough to re-identify them in a follow-up test, and (2) whether their memory of their liking for the products was stable. Two hundred people who purchased and ate strawberry yogurt participated in a three-part test session. Part 1) They tasted and rated their liking for three yogurt samples and either did or did not take notes on the sensory attributes of the yogurts. Part 2) They rated 27 mock yogurt labels representing 3 brands x 3 taste qualities x 3 prices x 3 health claims on a buying intent scale. Part 3) They rated their liking of the three yogurt samples either from memory or by retasting and they attempted to re-identify the three yogurt samples. Taking notes improved the proportion of completely correct re-identifications (75% vs 50%). Liking reratings from memory were as stable as liking reratings by retasting. Taste and health claim had the largest influence on buying intent; brand had little influence on buying intent.
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Interactions between perceptions of texture and volatile flavors were assessed by free-choice profiling using gelatin desserts as a model product. Gels were prepared with all combinations of 2 levels of gelatin, and 2 concentrations of 2 different flavors. A trained sensory panel profiled each sample for aroma, flavor, and oral and manual texture. Generalized Procrustes Analysis was carried out separately for each sensory modality. The results indicate that while gelatin concentration and flavor type both modified perception of flavor, flavor concentration did not. Gelatin content influenced instrumental, oral, and manual evaluations of texture; however, the type and level of flavoring had little influence on oral perception of texture.
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A total of 450 consumers participated in a test to determine whether questionnaire length, presence of key diagnostic questions or serving position affected their hedonic discrimination among yellow cakes. Consumers evaluated four yellow cakes representing a 2 × 2 factorial design of texture and flavor flaws. They used one of the following six questionnaires: only a 9-point hedonic scale, a 9-point hedonic scale with open end questions, and four others comprising a 2 × 2 factorial design with two levels of questionnaire length and two levels of questionnaire completeness. Neither the presence of key attribute questions nor the length of the questionnaire affected the value or the sensitivity of the judges’ overall liking scores. Samples tasted first received higher hedonic scores than those same samples tasted second throughfifth. Judges could discriminate among the samples on the basis of overall liking best when samples were tasted fourth or fifth.
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Temporal oral burn profiles for cinnamaldehyde, piperine and capsaicin were quantified using time-intensity (TI) parameters. Despite large judge-to-judge variation, TI profiles for eaters and noneaters of chile peppers differed significantly. Eaters had lower maximum intensities, shorter total times, and slower maximum rates of onset and decay. Judges with substantial desensitization also had shorter time-to-maximum intensities. Desensitized judges not only scored the burn of capsaicin as less intense, but also the burn of cinnamaldehyde and piperine. The burn of cinnamaldehyde solutions increased and decayed quickly; whereas, burns due to piperine and capsaicin increased and decayed slowly. Capsaicin compared to cinnamaldehyde, had time-to-max, plateau time, and total time that were 1.5, 2.0 and 3.0 fold larger; whereas, the maximum rates of onset and decay were 0.7 and 0.2 fold smaller, respectively. Temporal differences are believed to reflect differences in neural pathways for the irritant species.
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Sensory laboratories develop vocabularies for new products and even for some old products so that Quantitative Descriptive Profiling can be carried out. It is common to find that the vocabulary developed is too extensive to be used on a routine basis. One method of reduction is to use statistical methods to identify sub-sets of descriptors. This paper describes how these methods have been used in the development of a vocabulary for fermented milks. Sub-sets of the vocabulary were found, using the communalities from the principal component analyses, and these were verified to cover the sensory space by Procrustes Rotation. A confirmatory experiment was carried out using the reduced vocabulary. A Procrustes Rotation of the scores derived from the separate analysis of these experiments verified that they were in excellent agreement.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The biases to which the same-different task is prone can be accounted for by having subjects rate their confidence that two stimuli are the same or different. The rating method of detection theory was therefore used to study the discriminability of two concentrations of a fruit drink. A model in which the decision variable was the difference in sensory strength of the two samples provided a satisfactory fit to the Receiver Operating Characteristics of four of the five subjects. The bias-free index of discriminability, d′, was estimated for each subject. A combined operating characteristic, derived from jackknifing the data of the individual subjects, revealed an asymmetry characteristic of the differencing model. The results suggest that the same-different task, which is readily understood by subjects, can provide an unbiased measure of the discriminability of foods or beverages.
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper presents the intellectual history of product testing (sensory analysis). It traces the history from two separate streams; the expert (and expert panelist), and the empiricist (sociologist, followed by experimental psychologist). Sensory analysis in the last decade of the 20th century is host to many of the same intellectual arguments in these two fields as were current a half century ago, or longer, in psychology.What has been absent is a set of worldviews and organizing principles around which the field can grow and mature more rapidly. The paper presents three major organizing subject areas for sensory analysis: individual differences (sensory segmentation), sensory-instrumental analysis (reverse engineering), and cognitive approaches (mixed modeling and optimization of physical and conceptual variables). These three subject areas and their organizing principles provide sensory analysis with a vision of future research and application that accord with the scientific heritage and extend current procedures.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Multidimensional scaling (MDS) was used to study qualitative relationships among mouthfeel attributes encountered in oral healthcare products. Similarity estimates were obtained from a rapid sorting task and from pairwise similarity ratings. Configurations were interpreted as suggesting four groupings of oral sensations: numbing, astringency, pain and taste. The pain-associated sensations were further differentiated into thermally related sensations and chemically related sensations in some configurations. Two-dimensional solutions from the sorting task and from group-averaged similarity ratings were similar. Individual differences scaling solutions, however, showed unacceptably high stress in two dimensions, suggesting additional nuances in meaning to individual panelists that were not captured by group-averaged data or by sorting data.
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    Journal of sensory studies 8 (1993), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Approximately 300 subjects participated in a test to determine whether the level of salt in popcorn affected the change in overall liking observed as a consequence of consuming a serving of popcorn. Subjects tasted and rated three samples of popcorn (low, medium, high salt levels), ate a serving of popcorn at one of the salt levels and then tasted and rated the three samples again. Subjects returned one or seven days later and tasted and rated the samples again. Overall liking, salt intensity and salt liking were measured. The subjects also completed a questionnaire about their liking and consumption of popcorn. Liking scores for the popcorns decreased after eating a 3-cup serving; however, sensory specific satiety for the different levels of salt was not observed. Consuming low salt popcorn increased the rated saltiness of the popcorns, whereas consuming high salt popcorn decreased the rated saltiness — probably a frequency effect. When subjects retasted the popcorns one or seven days later, all liking ratings increased except the salt liking ratings for the high salt sample. There was also a trend for the overall liking of this high salt sample to increase less than for the medium and low salt samples. Questionnaire measures of liking or consumption were not related to the changes in liking observed.
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    Notes: Four types of spread with 80% fat, but varying in the origin of the fat (milk/vegetable) and in the proportion of oil versus solid fat (0–90% vegetable oil), were manufactured at NaCl concentrations of 1.0, 1.5 and 2.0%. Their saltiness and degree of melting in the mouth were rated using the time-intensity (TI) procedure. The perceived maximum saltiness of each NaCl concentration varied widely, samples with 80% milk fat + 20% vegetable oil being the most salty and those with 15% vegetable fat + 85% vegetable oil the least salty. The differences in saltiness were not directly related to the degree of melting in the mouth. The results demonstrate that extrapolating saltiness on the basis of NaCl contents over brands of products would be risky, since saltiness and NaCl contents are not necessarily correlated even in apparently similar products.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A highly trained, descriptive sensory panel identified, defined, and referenced 30 flavor attributes for cheese. The attributes generally could be described as dairy-like (buttery, cooked milk, dairy-fat, dairy-sour, dairy-sweet); fatty-acid/animal (animalic, butyric, decaying animal, fresh fish, fish oil, goaty, sweaty, waxy);fungal (moldy, mushroom); other aromatics (fermented fruity/winey, fruity, nutty, pineapple, sauerkraut, smokey, soy sauce); mouthfeelings (astringent, biting, pungent, sharp); and fundamental tastes (sweet, sour, salty, bitter).All attributes, except fresh fish and smokey, described significant differences among the 42 cheeses. Some of the flavor attributes, including many of the dairy attributes, the fundamental tastes, and sharp and astringent mouthfeelings, were common to all the cheeses tested in this study. Other attributes, such as buttery and butyric acid, were found in most cheeses. Several attributes, for example, cooked milk and sweaty, were specific to only a few cheeses.The factor analysis of the data was unclear, indicating that no one factor solution best described the data. Further study of the factors indicated that groupings of some attributes resulted in substantial loss of cheese description. Therefore, the original attributes probably cannot be reduced substantially in number and still adequately describe natural cheese flavor.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Assessed under low-intensity red illumination, homogenized and thickened higher fat milk samples evoked higher sensory ratings of creaminess than did the unhomogenized or lower-fat milks that had not been thickened to the viscosity of double cream. Furthermore, perceptual ratings of fat content showed the same dependency on homogenization, higher fat and thickness and were entirely accounted for by the creaminess ratings. This indicates that assessors recognize the type of milk or cream most similar to a rated standard and infer its fat content on the basis of tactile patterns produced in the mouth by forces at the surface of small and even-sized dairy fat globules when bulk forces are produced by sufficient viscosity.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Three hundred and forty-two consumers participated in a study examining slight color variation in orange juice. Panelists evaluated two orange juice samples; unadulterd juice and the same juice with a slight green off-color. The color manipulation reduced consumer acceptance of the color of the adulterated sample but had little influence on ratings of flavor, sweetness or overall liking. Older panelists were more strongly influenced by the color manipulation and showed a clear preference for the flavor of the control sample as compared to the adulterated sample. These data suggest that color was important for the visual appeal of orange juice, but the color change alone was not sufficient to alter consumer acceptance of this product.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Data from an inexperienced and experienced sensory panel with similar training were compared in two experiments, the first on a product class that the experienced panel had tested extensively and the second on a product class unfamiliar to either panel. This study indicates that inexperienced panelists having the same intensive descriptive training as their experienced counterparts can be used on the same panels as experienced testers with little effect on the data. The minimal experience effect found in both experiments in this study was not the result of experience in a specific product category, but appeared to be a more general effect. We hypothesize that thorough training may be more important than experience for increased “reproducibility” in panelists.
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The ability of panelists to distinguish between samples of apple juice with two levels of added sucrose (0.1 and 0.9 g/100 mL) or NaCl (0.05 and 0.14 g/100 mL) was determined using a modified signal detection technique. Samples at various temperatures (6, 24, or 50C) were presented with various rinse conditions. Sometimes a water rinse (6, 24, or 50C) was presented between samples and somtimes not. R-index values were calculated to predict the ability of panelists to distinguish between samples. No temperature effect was found for sweetness difference tests; however, R-indices showed that salty differences in apple juice were more distinguishable at a sample temperature of 24C than at 6 or 50C. Samples temperature had a greater effect than rinse condition (temperature or no rinse) on discrimination between samples differing in NaCl concentration.
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  • 92
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 8 (1993), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Are texture and appearance important factors in consumer choice of cheddar cheese? Quantitative descriptive analysis gives large data sets, but it is not clear how much is relevant to consumer perception. In a study of 20 cheddar style cheeses, free-choice profiling was employed to explore consumer discrimination. Appearance was the dominant factor, in particular color. Precise coloration was important to panelists. Textural descriptors related to perception of cheese character in the mouth appeared to relate to styles of cheese production and regional differences. Maturity was also a descriptor that could be defined in textural terms, and cheeses described as mild, vegetarian and low-fat cheeses were discriminated using descriptors related to elasticity and immaturity. It was apparent that the cheddar cheeses were perceived as being very varied in both appearance and texture, and the consumer panel discriminated between products readily using a range of descriptors.
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  • 93
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 8 (1993), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A data reduction protocol was designed to minimize distortion inherent in sensory data. Following removal of nonexistent attributes and treatment levels, extreme value analysis and distribution comparisons combined with graphical respresentations, facilitated elimination of inconsistent (with respect to overall consensus) panelists. Application of a calibration factor showed superresponsive panelists (those with intensity values consistently higher than other panelists) were among the most accurate and thus were retained in spite of their tendency to produce extreme value data. Panelists that consistently produced a narrow variance around the overall mean and rarely produced extreme values were classified as noncomittal and removed. Analysis of variance calls for a split plot design; blocks (sessions) and treatments in main plot, and panelists in subplot. In general, the subplot can be ignored. These methods are suggested for evaluating panelists’ training needs; and for eliminating data that distorts the statistical analysis.
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  • 94
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    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 8 (1993), 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 consumption of bitter taste substances (caffeine and beer) to bitter taste sensitivity was examined by 19 healthy adults. For individual taste sensitivity, detection thresholds were used on 6 bitter substances (caffeine, iso-alpha-acids: beer bittering agents, quinine sulfate, L-tryptophan, L-phenylalanine and glycyl-L-phenylalanyl-L-phenylalanine) and 3 non-bitter substances (L-aspartic acid, aspartame and NaCl). Nonusers of caffeine had significantly higher sensitivity (lower threshold) for caffeine compared to moderate and heavy users. Slight consumers of beer had significantly higher sensitivity for iso-alpha-acids relative to heavy users of beer, Iso-alpha-acids were not detected in saliva in acute dosing test by using 6 subjects. The correlations between thresholds of 6 bitter substances were calculated. Significant correlations (p 〈 0.01) were noted in 2 cases between caffeine and quinine, and iso-alpha-acids and L-trypothan. These data suggest the significant relation between individual bitter taste sensitivity and the consumption of caffeine and beer (iso-alpha-acids).
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  • 95
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Focused difference testing was applied to two orange juices prepared from frozen concentrate. Differences were noted between the juices for darkness of color, visual appearance of pulpiness, resistance to tongue movement, flavor by mouth, odor, overall taste and taste other than sweetness. The logic and approach of focused difference testing is discussed and contrasted with other sensory analytical techniques.
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  • 96
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 8 (1993), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 97
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 8 (1993), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Consumer preference for a common ‘yellow cake’ prepared from a commercially available cake mix and for three ‘health modified'cakes was measured using signal detection ranking procedures. Consumers found the ranking protocol simple to use, making it a viable alternative to hedonic scaling. Measures of likelihood to choose to eat, after provision of nutritional information about the cakes, showed the same trend as measures of preference taken before. Yet, the dominance of preference for yellow cake over the ‘health modified’ cakes was reduced.
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  • 98
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    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 7 (1992), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Three studies were conducted to assess the effects of disconfirmed consumer expectations on food acceptability. In the first, disconfirmed expectations for the sensory attributes of an edible film had a negative effect on acceptability of the film. Greater disconfirmation resulted in lower acceptance and purchase intent. In the second study, written product information was used to establish three levels of expected acceptability and expected bitterness for a novel fruit beverage. Comparison of preexposure (expected) and postexposure (perceived) ratings of acceptability and bitterness supported an assimilation model of disconfirmation effects for conditions in which expectations of acceptability were high and expectations of bitterness were low. A contrast effect was observed for bitterness judgments when expectations of bitterness were high. Associative effects resulting from the expectation manipulation were observed on other sensory attributes. In the third study, expectations were manipulated to influence both direction (positive versus negative) and degree of disconfirmation for the acceptance of cola beverages. Results provided further support for an assimilation model of these effects.
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  • 99
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 7 (1992), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Studies of the Receiver Operating Characteristic (ROC) for taste are reviewed and new data on its shape are presented. What evidence there is suggests that ROCs for taste conform to the normal-normal equal variance model of signal detection theory. Few ROCs for taste have been reported, probably because the large number of trials required by detection theory makes the task arduous for subjects in taste experiments. However, pooling ratings from several subjects and estimating the parameters of the pooled ROC by jackknife techniques circumvents that problem to some extent. Because experiments on taste are often based on a small number of trials, it is especially useful to determine the standard errors of ROC parameters. Methods for estimating these standard errors, including that of the area measure, p(A), are therefore presented.
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  • 100
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 7 (1992), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pungent spices are well-recognized for their aromatic and pungent nature; however, relatively little is known about their pungent or ‘burning’ responses. Therefore, this research was undertaken to characterize oral pungency of the principal irritants or red pepper (capsaicin), black pepper (piperine), cinnamon (cinnamaldehyde), cumin (cuminaldehyde), cloves (eugenol), ginger (ginger oleoresin), and alcohol (ethanol). These compounds were evaluated for four pungent qualities (burning, tingling, numbing, overall), two temporal qualities (lag time, overall duration), and three spatial qualities (longitudinal location, lateral location, localized/diffuse). The pungency of cinnamaldehyde was primarily burning and tingling. It had a quick onset and rapid decay. The pungency of eugenol had a long-lasting, predominantly numbing effect. The pungency piperine, capsaicin and ginger were primarily burning, but had different temporal and spatial responses. The pungency of ethanol was most diffuse in nature, with some burning and tingling sensations. It had the shortest perceived onset and overall duration. The pungency of cuminaldehyde was equally burning, tingling and numbing.
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