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  • Articles  (8,969)
  • 2000-2004  (8,969)
  • 1950-1954
  • 2003  (8,969)
  • Process Engineering, Biotechnology, Nutrition Technology  (8,969)
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  • Articles  (8,969)
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  • 2000-2004  (8,969)
  • 1950-1954
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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food safety 23 (2003), S. 0 
    ISSN: 1745-4565
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Factors that significantly affect BAX® PCR detection of Listeria monocytogenes from optimized Penn State University (oPSU) broth were identified and optimized. Concentration of PCR product was significantly reduced by BAX™ protease and significantly increased by eliminating the lysis step and directly diluting oPSU broth prior to PCR. A simple oPSU broth-BAX® PCR-PicoGreen® (PSU-BAX-PicoGreen) system was developed and compared with current methods for detecting low levels of L. monocytogenes in commercial milk and hot dogs. All 30 milk samples inoculated with 10–20 CFU per mL L. monocytogenes were positive by FDA, BAX® and PSU-BAX-PicoGreen methods and all 42 uninoculated milk samples were negative by all of the above methods. All 30 hot dog samples inoculated with 10-20 CFU/g L. monocytogenes were positive by the USDA and PSU-BAX-PicoGreen methods, however, 2 hot dog samples gave indeterminate results with the standard BAX® method. All 42 uninoculated hot dog samples were negative by USDA, 9 were indeterminate by BAX® and 2 were positive by PSU-BAX-PicoGreen. The PSU-BAX-PicoGreen system may provide a simple and accurate method for rapidly screening pasteurized foods for both injured and noninjured L. monocytogenes.
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food safety 23 (2003), S. 0 
    ISSN: 1745-4565
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In this study, 851 Staphylococci isolates isolated from 38 raw milk samples were investigated for DNase activity and slime production. The 851 Staphylococci isolates were identified as 704 Staphylococcus aureus and 147 coagulase-negative staphylococci. Coagulase – negative staphylococci isolates were classified as 32.7% S. cohnii, 19.7% S. hominis, 19.1% S. xylosus, 12.9% S. epidermidis, 8.2% S. capitis, 4.8% S. haemolyticus, 1.4% S. simulans and 1.4% S. saprophyticus by using Dichotomous scheme. DNase agar was used to investigate for DNase activity. DNase activity was found in 93.6% of 704 S. aureus and 10.2% of 147 coagulase – negative staphylococci. DNase activity was positive in 42.9% of S. haemolyticus, 20.7% of S. hominis, 17.9% of S. xylosus and 2.1% of S. cohnii isolates. No DNase activity was found in S. epidermidis, S. capitis, S. simulans and S. saprophyticus isolates. Slime production of S. aureus and coagulase – negative staphylococci from raw milk samples was investigated by using Congo Red Agar method. Slime production was positive in 5.1% of S. aureus and 42.2% of 147 coagulase – negative staphylococci. Slime production was positive in 100% of S. simulans, 68.4% of S. epidermidis, 50% of S. cohnii, 50% of S. saprophyticus, 37.9% of S. hominis, 32.1% of S. xylosus and 16.7% of S. capitis isolates. None of the 7 S. haemolyticus isolates had slime production. In conclusion, slime production and DNase activity are important virulence factors to identify pathogenic staphylococci.
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  • 3
    ISSN: 1745-4565
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Calabaza (Curcubita moschata) is a tropical squash which is gaining popularity as a specialty crop for agricultural producers in the Northeast United States. It is commonly marketed by being cut in half, wrapped in plastic and may be held unrefrigerated until sold. This method of display is essential for consumer acceptance, yet unrefrigerated storage means that some potential for food safety problems exists. Experiments were conducted to determine the potential for bacterial growth during storage of cut calabaza. Freshly cut calabaza contained between 1.3 and 4.7 log10CFU/g aerobic mesophiles. By 10 h, duplicate counts from some samples exceeded 4 log10 CFU/g. After 24 h of room temperature storage, total aerobic plate counts ranged from 5.2 to 7.7 log10 CFU/g. Rapid bacterial growth on cut calabaza stored at room temperature indicates that these products are highly perishable, and may be able to support the growth of pathogenic bacteria, should they be introduced during the slicing process.
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  • 4
    ISSN: 1745-4565
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The aim of this study was to investigate fecal shedding and transmission of E. coli O157 in cohorts of cattle within a feedlot, to assess subsequent contamination of carcasses with this pathogen and to identify risk factors associated with fecal shedding of E. coli O157. A cohort of 133 heifers housed infour adjacent pens was examined over a five month period, from entering the feedlot to slaughter. Individual rectal fecal samples and pen environmental samples were taken at monthly intervals. The entire outer and inner surfaces of a carcass side of each animal were swabbed immediately following slaughter.E. coli O157 was isolated from 136 (23%) of the 600 rectal fecal samples; 96% of which contained virulent markers. One hundred and sixty environmental samples were examined and E. coli O157 was isolated from 46 (29%), all of which contained virulent markers. E. coli O157 was not isolated from any of the dressed carcasses. The prevalence of E. coli O157 fecal shedding may be related to the pen and E. coli O157 contamination of the pen floor feces, water trough and feed.E. coli O157 should be considered as a pathogen shed in the feces of a substantial proportion of feedlot cattle. However, with good hygienic practice at harvest, a very low level of this pathogen can be achieved on dressed carcasses.
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food safety 23 (2003), S. 0 
    ISSN: 1745-4565
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Polymeric films were coated with nisin, an antimicrobial peptide, for potential application in shelf-life extension of food. Five commercial packaging films with varying surface energies were compared. The highest antimicrobial activity was observed on the most hydrophobic nisin-coated films (surface energy ± 32 dyne/cm). The binding affinity of nisin to the surface of ethylene acrylic acid copolymer (surface energy = 32 dyne/cm) was investigated. Films were coated in nisin solutions under varying conditions including nisin concentration, contact time, solution's volume to film area ratio, pH of coating solution and temperature during coating. Stronger nisin activity was detected on films as the coating time increased from 30 s to 2 h. Higher nisin coating concentration also promoted the binding of nisin to films with saturation level observed at 250 μg/mL. Films coated with nisin using a higher solution to film area ratio (0.84 compared to 0.14 and 0.28 mL/cm2) also exhibited higher nisin activity.
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food safety 23 (2003), S. 0 
    ISSN: 1745-4565
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Biofilms enable foodborne pathogens to resist removal from surfaces, survive disinfection and elude detection. This study evaluated the use of Calcofluor, which binds to polysaccharides containing β-D-glucans, to detect biofilms produced by Salmonella enterica serovar Berta and Salmonella enterica serovar Typhimurium DT104 (St DT104), Escherichia coli, Aeromonas hydrophila, Vibrio cholerae O139 and Hyphomonas adhaerens. Biofilms produced by St DT104, S. berta and V. cholerae on five types of surfaces (glass, polypropylene, Teflon™, stainless steel and aluminum) were detected by Calcofluor. Results suggest the potential use of Calcofluor as probes of foodborne pathogens in biofilms.
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: We compare the sensory profiles of six dark chocolates done by two types of juries: some trained juries and an untrained jury. Six laboratories, each one made up of 10 to 15 judges, are regarded as trained juries since the assessors were well trained before the evaluation of the products. The second type of jury is composed of only one panel of 29 untrained assessors and this jury is named the untrained jury. Fourteen attributes were evaluated and analyses of variance have been carried out by attribute to compare the sensory profiles of the six chocolates done by the trained juries and by the untrained jury. These analyses of variance show that the two types of juries give similar sensory profiles and that the few differences are mainly due to different ways of using the scale.
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Consumers unfamiliar with passion-fruit juice were presented with 24 computer generated package images on which six packaging factors (background color, picture, information, brand, language and shape) had been manipulated and asked to give scores for six expected sensory attributes (sweetness, pureness, sharpness, refreshing, freshness, naturalness) and liking. Significant effects were obtained for each attribute, with background color and information being the most important. Consumers varying in Need For Cognition (NFC) were affected differently by the investigated features of the package. High NFC individuals used less of the packaging factors than low NFC subjects did.
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  • 9
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The aim of the study was to determine how those texture attributes that elderly people find difficult to eat are related to their preferences for different modifications of carrot textures. This study was conducted with same methods in Finland and in the United Kingdom (UK). Trained sensory panels in both countries described sensory profiles of a range of carrot samples with same glossary of texture terms. The texture of carrot samples was manipulated using different preparation and cooking methods. Based on the Principal Component Analysis (PCA), boiled and puréed samples were perceived as soft, wet, pulpy and smooth, whereas raw samples were dry, brittle, rough, crispy and crunchy. Two age groups were used for the consumer tests: a young adult group aged 23 to 40 years, mean 32 (Finland) and 33 (UK) and an elderly group aged over 60 years, mean 75 (Finland) and 76 (UK). Both the elderly and young adult respondents considered samples as difficult to eat if they needed a long chewing time, were crunchy, hard, brittle, dry, rough or sharp, such as raw slices and coarsely grated samples. On the other hand, slimy, wet, smooth, soft and pulpy samples, such as boiled carrots and purée, were considered as easy-to-eat. The young adults liked more difficult textures such as rough, crispy, crunchy and hard than did the elderly respondents, but the easiest textures were not liked by either age group. Subjects with dental deficiencies liked easier textures more than those fully dentate.
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Aroma evaluation of 14 commercial red wines of the Uruguayan market (5 Tannat, 5 Cabernet Sauvignon and 4 Merlot) was done by descriptive analysis. Generalized Procrustes Analysis applied to the data allowed differentiating among the three groups of samples and obtaining sensory attributes that were responsible for these observed differences. The samples of Tannat were differentiated from Cabernet and Merlot samples and their aroma profile was characterized by secondary and tertiary descriptors of: berry (blackcurrant), dried fruit (prune), resinous (oak), spicy (liquorice) and microbiological (yeasty).
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  • 11
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: If a chi-squared analysis were to be performed to determine whether preferences were significant in a paired preference test, the appropriate expected frequencies in the analysis would represent those that would occur should the consumers have no preference. One way of determining these ‘no preference’frequencies, for a particular test situation, would be to note the preference responses obtained when the stimuli were putatively identical. Over 2000 consumers were given paired preference tests in which the stimuli were putatively identical. Response conditions and consumer groups were varied and the proportions of preference and no preference responses were noted. In a preliminary experiment, further research was seen to be justified when for putatively identical stimuli, judges did not exclusively express lack of preference; many expressed a preference for one or other of the stimuli. Further experiments were conducted using a written response condition and putatively identical potato chips (potato crisps) as stimuli. Using a single ‘no preference’option, variation in the placement of this option at either first, second or third place on the response sheet had no significant effect on the response frequencies. The proportion of ‘no preference’responses was approximately 30% in all cases. A previously reported 40-20-40 distribution was not always confirmed. The experiment was repeated with Korean consumers; these had fewer ‘no preference’responses. Deriving preferences from hedonic scales, rather than having judges respond to preference options, increased the proportion of ‘no preference’responses, with American judges still having more than Korean judges. Yet there are logical objections to extracting preference data from hedonic scales. Increasing the number of ‘no preference’options to two or three, had the effect of increasing the number of ‘no preference’responses up to as much as approximately 60%. Extending the results to Koreans, using two ‘no preference’options, it was seen that only the judges in an anonymous response condition had significantly fewer ‘no preference’responses than Americans. The use of these response frequencies as expected frequencies in chi squared analyses was illustrated, after adjustments for counterbalancing.
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  • 12
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The influence of thickening agent (0 and 7g/L), mechanical treatment (low and high) and flavoring agent concentration (2.2 to 63.2 μL/kg) on texture, taste and aroma of low fat stirred yogurts was investigated through sensory profiling by a panel of ten subjects trained on 13 attributes. Two assessment conditions were used: either in the presence or in the absence of olfactory perception (nostrils closed with nose clips). Sensory differences were greater for texture than for the other perception modalities. Olfactory perception enhanced yogurt astringency. If both thickener addition and mechanical treatment influenced texture attributes and rheology, the second factor had the strongest effect. Texture attributes were highly correlated with rheological parameters. Increasing flavoring agent concentration tended to decrease thickness and the addition of thickening agent depressed green apple notes and sweet taste, suggesting texture/flavor interactions.
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  • 13
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The objective of study was to assess the influence of the knowledge of color and brand name on consumer response to tomato purees. From focus group interviews it was found that taste and odor of fresh tomato were the most important drivers of consumer choice. To quantify that information a questionnaire was developed and it was submitted to fifty consumers of tomato puree. The questionnaires answers confirmed those coming from the focus group, although same discrepancies were found with those derived from the consumer test. Results showed that color and brand name seemed to be more important than taste and odor of fresh tomato, in fact those attributes, when consumers were tasting samples, affected not only hedonic judgments but sensory perception as well. Finally physico-chemical parameters derived from instrumental measurements have been compared to sensory data by means of PCA in order to validate the consumers’assessment of sensory attributes of tomato puree.
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  • 14
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Spices and condiments have been considered virtually indispensable in the culinary art. The quality of spices varies depending on the region of cultivation, climatic conditions and storage history. In the present study, coriander from 8 regions of India, labeled as R1 to R8, were examined for sensory quality by conducting threshold test, time-intensity study and flavor profiling. Principal component analysis (PCA) was carried out to group the samples. Threshold values ranged from 0.010 to 0.035% with R7 showing lower values for threshold (0.010%) followed by R8 (0.020%). Higher intensity of aroma of R7 and R8 was further confirmed by more of lingering aroma as shown by time intensity study. Flavor profiling by quantitative descriptive analysis showed that the coriander samples from different regions did not differ significantly (P± 0.05) in almost all attributes except for spicy aroma. Mapping of samples using PCA technique showed that the samples occupied different quadrants based on the intensity of attributes. Sample R7 and R8 were found to be grouped close together, and R5 and Reformed another group.
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  • 15
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The influence of bite size on sensory mouthfeel and afterfeel sensations was explored in two studies in which single bites of vanilla custard desserts were varied from itollmL (study 1) and in which series of five bites of two different custard desserts were presented consecutively (study 2). In single bites, sensations of perceived creaminess were enhanced with size whereas sensations of astringency and temperature were suppressed. Bite size also affected perceived thickness, but the direction of the effects varied with custard desserts. With multiple bites, creaminess sensations continued to increase, whereas other sensations were unaffected. Switching to a second series of bites of another vanilla custard dessert showed larger sensory effects, especially on astringency sensations but also to a lesser extent on sensations of thickness and fatty afterfeel. Single and multiple bite results are discussed in terms of possible peripheral mechanisms. Switching results are discussed in terms of possible central sensory contrast mechanisms.
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  • 16
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Mesquite (Prosopis sp.) is a fast-growing tree that produces abundant amounts of pods. Although these pods were once part of the diet of Southwest Native Americans, little is known today regarding the acceptability of mesquite flour. We standardized a recipe using mesquite flour with a commercially available ready-to-eat cereal product and tested the acceptance of the product with Native American participants (n=84). Participants were asked to complete a food acceptability survey and a food action rating survey to determine taste sensory perception and expected frequency of consumption. Although participants were significantly more likely (P= 0.008) to prefer the cereal without mesquite than with the mesquite added, participants reported favorable acceptability with the cereal, both with and without mesquite flour added. The results of the FACT food frequency survey were positive for both the product with mesquite added and without, with no significant difference (P= 0.07) between the two. These data support the potential for mesquite to be reincorporated as an acceptable ingredient in modern diets of Native Americans.
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  • 17
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Oral sensory evaluation of caramel texture was conducted using six texture terms and results were compared to instrumental testing of texture. Trained panelists (n = 11) evaluated 6 caramel formulations by descriptive analysis. Mean texture values indicated that a slight increase in sweetened condensed skim milk and vegetable fat content (1% w/w at a 2:1 ratio) significantly decreased stickiness (P≤ 0.05). Decreasing corn syrup dextrose equivalent (DE) decreased stickiness and increased hardness (P≤ 0.05). Pearson correlation coefficients revealed that stickiness to teeth while chewing, toothpacking, and tooth adhesiveness were highly correlated with one another (P≤ 0.05). Sensory hardness, cohesiveness, and number of chews were correlated with the rheological properties of storage modulus and viscosity, while stickiness was correlated with probe tack force (P≤ 0.05). Such correlations show that fundamental rheological and tack force measurements can be used to help determine molecular mechanisms for sensory texture and stickiness.
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  • 18
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: We show that adding replications in replicated difference tests results in larger power and smaller variance when the number of assessors is fixed. On the other hand, when the number of total assessments is fixed, the power usually decreases and the variability increases whenever replications are considered instead of different assessors. The appropriate numbers of assessor needed to gain the same power and variability, respectively, when replications are used will be given. It is shown that the number of assessors might indeed be reduced, but this has to be paid for by an increasing total number of assessments. We show that two key models, namely the mixture binomial and a corrected version of the Beta-binomial model, are quite similar with respect to the properties of interest. We provide tables from which, according to her/his requirements, the investigator might find an appropriate setting with respect to the number of assessors and replications.
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  • 19
    Electronic Resource
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The definition of “flavor” is a term that appears to vary from one area to the next. A survey was conducted on 140 individuals in various areas of specialization (agriculture, food science, sensory evaluation, and the chemical senses) to see what sensations are thought to be involved in “flavor,” as well as whether there were any differences in definitions across groups. The results demonstrate that while a fairly stable definition of the term does exist, there is some difference in what different groups of expertise mean when they refer to “flavor.”
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  • 20
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper presents the author's approach to synthesizing useful direction from product testing when the stimuli are not systematically varied. The approach presented here comprises a research design and data analysis strategy, rather than a conventional product optimization with subsequent validation. The design steps comprise stimulus selection, attribute selection, and product evaluation. The data analysis comprises univariate modeling to show how sensory attributes drive overall liking, reduction of the matrix to factor scores for multivariate modeling, and then the creation of an integrated product model. The outcome is a set of factor scores that can be translated to sensory attributes and in turn to target products.
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  • 21
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A number of commonly consumed fruits and vegetables (e.g., kiwifruit, pineapple and taro) cause oral irritation, and there is anecdotal evidence that this influences the acceptability of such products. In each of these foods, oral irritation is produced by free crystalline calcium oxalate (raphides). The psychophysics of the mechanical oral irritation caused by raphides was studied in two experiments using a model system based on kiwifruit. In the first experiment, the location of irritant sensations and perceived intensity of the irritation caused by suspensions of raphides were determined using a ten-member trained sensory panel. Stinging and numbing were found to increase significantly with increasing concentrations of raphides. Stinging occurred principally on the tongue as well as in the throat and numbing principally on the tongue. The number of oral areas irritated was shown to increase with raphide concentration and to decrease over a 60-min period. In the second experiment, sugars (fructose, sucrose, glucose and inositol), acids (citric, malic and quinic) and an enzyme (actinidin) were added to the model to examine interactions between these chemical stimuli and the mechanical action of the raphides. Addition of acids to the model was shown to enhance irritation in addition to increasing sourness and suppressing sweetness. The addition of actinidin had no significant effects on irritation or tastes. It is suggested that acidity may aggravate irritation at low raphide concentration, but beyond a critical level of mechanical irritation the presence of acids has little additional effect. These results provide the first detailed data of the psychophysics of mechanical oral irritation in food, and have important implications for producing foods with lower levels of irritation and increased acceptability.
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  • 22
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A standardized descriptive language for skim milk powder and dried dairy ingredients was developed. The lexicon was initially identified from a large sample set of dried dairy ingredients (138). A highly trained descriptive panel (n = 14) refined terms and identified references. Dried dairy ingredients (36) were then evaluated using the developed language. Twenty-one descriptors were identified for dried dairy ingredients. Seventeen flavors and tastes were identified in skim milk powders (27) with nine flavors/tastes observed in all skim milk powders. Dried dairy ingredients were differentiated using the language (P〈0.05). There were flavors common to all dried dairy ingredients while other flavors were specific to particular products.
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  • 23
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Sensory properties and consumer perception of 2 ‘home-made’and 4 commercial dairy ice creams were examined. Conventional profiling by a trained panel found that most samples differed significantly in all attributes, but distinction of ‘home-made’from commercial products was limited to few attributes. Principal component analysis separated the ‘home-made’products from the commercial ones mainly on the basis of differences in appearance, aroma, creamy flavors and textural attributes. A consumer group (n=105) recorded preconception of ‘home-made’ice cream acceptance, then received the product samples, in unlabeled condition, for assessment of degree of liking (DOL) and for identification as ‘home-made’or commercial. Internal preference mapping of the DOL ratings showed that consumers were more closely grouped around samples which had higher intensities of certain attributes. Higher ‘denseness’, ‘vanilla’aroma and ‘buttery’flavor, were associated with more liking for commercial products. The ‘home-made’high fat sample, although liked, tended to be grouped with commercial products. More marked textural attributes of ‘ice crystals’and ‘breakage’aided identification of the low-fat ‘home-made’formulation, which was less liked overall. Overall, differences between the ‘home-made’and commercial samples were small but consumer perception of the term ‘home-made’was viewed favorably for dairy ice cream.
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  • 24
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An established disparity between hedonic scales and just-about-right (JAR) measures, important for product development procedures, was examined for sweetness in lemonade by consumer groups divided on the basis of health concern level and consumption patterns related to sweet foods, regular and diet drinks and ‘healthy eating’. The disparity was demonstrated by all subgroups in that the JAR scale identified a lower sucrose concentration as nearest ‘just right’compared to that identified as ‘most liked’by the hedonic scale. Regression analysis predicted lower optimum sweetness for the JAR than the hedonic scale. For subjects who completed both tests the disparity was significantly different from zero. Trends of differences in response on both scales and for the disparity according to health concern and consumption patterns were demonstrated graphically. Few of these effects were statistically significant, but the differences in disparity level could justify market segmentation of drink products with different sucrose levels.
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    Journal of sensory studies 18 (2003), S. 0 
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper presents results on consumer attitudes towards healthy soup, using conjoint analysis, executed on the Internet. The results show moderate interest in new ideas for the total panel, but reveal three concept-response segments. The first segment responds to nutrition and functional ingredients. The second segment responds to packaging and convenience. The third segment responds to taste and ingredients. Statistical analysis confirms the idea that they represent different ‘mind-sets’. The segmentation based on psychographic variables is a useful tool to identify the features of the next generation “healthy soups” and to design custom products on the basis of consumer requirements.
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  • 26
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    Journal of sensory studies 18 (2003), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A statistical study was performed on the scores awarded by a taste panel over a full Roncal cheese manufacturing season. The panel evaluations were part of a quality control program carried out on that cheese under the auspices of the Appellation of Origin for Roncal cheese by panelists previously trained and qualified as proficient. Analysis of variance and factor analysis were performed to examine variability for the different attributes and the influence of such factors as cheesemaking plant and the manufacturing season and also to monitor panel reliability. The results indicated that the attributes associated with the descriptor “characteristic” had the highest variability; these attributes were characteristic odor, characteristic aroma, characteristic texture, characteristic flavor, and characteristic aftertaste. Cheesemaking plant was the factor that had the greatest effect on variability. Factor analysis and exploratory box plot data analysis were used to detect discrepancies between individual assessors and the rest of the panelists.
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    Journal of sensory studies 18 (2003), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Different Spanish unifloral honeys (eucalyptus, sunflower, rosemary, thyme, lavender, citrus, anise, quercus, and lemon blossom) and one multifloral honey were studied by Free-Choice Profiling (FCP) analysis. Generalized Procrustes Analysis (GPA) applied to the FCP data allowed discrimination between samples and provided information on the attributes responsible for the differences observed. The honeys had significantly different sensory characteristics. Textural attributes were the predominant factor in discriminating between samples, and appearance (color included) was also correlated with GPA dimensions to a lesser extent.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 29
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper deals with responses to concept elements for grapefruit juice using hybrid conjoint analysis. Sensory-based concept elements perform as well (and as poorly) as do nonsensory-based concept elements. Concept-response segmentation analysis revealed three distinct groups, oriented to sweet taste, nonsweet taste, and color/appearance, respectively. Response patterns of segments are not polarized. What one segment likes most the other segment may simply accept to a moderate degree. This pattern differs from what typically happens with actual products. The segments differ in the way that they process the information in a concept, based upon response time as a separate dependent measure. Sensory-based concept elements may act as gatekeepers to assure respondents that the product is acceptable, and thus may shorten the search for additional information. In contrast, for products and sensory-preference segmentation, sensory attributes typically act as Drivers of LikingTM, rather than as gatekeepers.
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  • 30
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The range of scores elicited by a structured, an unstructured and a ‘labels-only’version of the 9-point hedonic scale were compared using consumers from USA, Japan and Korea. It was found that the unstructured scale elicited a wider range of scores for American and Japanese consumers. After correction for hedonic ranges, it was found that Japanese had smaller ranges of scores on all three scales, although the effect was less pronounced for the unstructured scale. The Korean consumers were the exception. Their ranges were less than Americans but their ranges on the unstructured scale did not increase. The results were discussed in terms of the effects of inhibition of use of categories by the scale labels, effects of translation from the English, psychophysical style and order effects.
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  • 31
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: STANDARDIZED OLFACTORY POWER LAW EXPONENTS. 2000. M. Devos, J. Rouault P.
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  • 32
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    Journal of sensory studies 18 (2003), S. 0 
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Three brands of ready to serve mango drinks namely ‘Frooti’, ‘Real’and ‘Slice’that are available in the market were used for sensory evaluation along with the vacuum dried reconstituted mango powder drink. Mango powder was produced from mango pulp of ‘Totapuri’variety with addition of Maltodextrin, Glycerol monostearate and Tri calcium phosphate at rate of 0.62, 0.015 and 0.015 kg per kg dry mango solid, respectively. These ingredients were added for getting a nonsticky free flowing powder. The pulp along with the ingredients was dried in a vacuum drier at 70 ± 2C and 710–750 mm Hg vacuum. Fuzzy logic analysis was used for finding out the best of the three market mango drinks. BrimA index (a criterion for acceptance of fruit juice) and total solid (kg per kg drink) of the reconstituted mango drink was adjusted based on the BrimA index and total solid values of the best market drink. The reconstituted mango drink satisfied the quality criteria set for ‘mouth feel’but not the color, smell and taste.
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  • 33
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: There are some theoretical difficulties in the philosophy and methodology of sensory difference and preference tests. The difficulties lie in the assumption that the subjects have the same response ability, which is in conflict with psychological ideas about the processes of perception and decision. A Bayesian approach may overcome these difficulties by treating the parameter of proportion as a random variable. This paper presents a Bayesian approach for analysis of data from such sensory tests.
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  • 34
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Coffee served at temperatures recommended by the hospitality and food literatures for brewing and holding are above thermal pain and damage thresholds. Yet, consumers do not report pain or damage on drinking coffee at such temperatures. To investigate this discrepancy, the temperature of hot coffee before and during sipping was investigated for 18 subjects. Coffee temperature was continuously monitored by thermocouples in the cup, in the coffee bolus in the oral cavity and on the surface of the tongue. There was minimal cooling as the coffee entered the mouth from the cup, yet the coffee temperature was still above threshold for inducing burn damage. It is hypothesized that during drinking, the bolus of hot coffee is not held in the mouth long enough to heat the epithelial surfaces sufficiently to cause pain or tissue damage.
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  • 35
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The application of sensory methodology for measuring deodorizing effect of an air conditioner equipped with electric plasma was introduced. Deodorizing effect was measured using chemical and sensory methods at different time (0, 30 and 60 min) and mode (control, blowing and cooling) of an air conditioner. Smoke from a roll of cigarette in a closed room was used as a source of odor and the concentrations of acetic acid and ammonia were measured as odorous chemical components. As one of the sensory methods triangle test was used and as a first step to obtain deodorizing effects by triangle test, the threshold of each panelist was obtained as the log dilution ratio of odor concentration at which the difference from odorless air was detected. The odor concentration at each time and mode was calculated using the threshold of the panel and the deodorizing effect was obtained on the basis of the odor concentration. In addition to a triangle test, scaling methods such as category scaling or magnitude estimation were used to measure deodorizing effect of an air conditioner. Deodorizing effects by scaling methods were calculated based on odor intensity with time at each mode. The regression analysis was done between the efficacy of deodorizing effect by sensory test and those by acetic acid and ammonia, the R2 values of the regression equations for triangle test, category scale, and magnitude estimation were 0.84, 0.72 and 0.69, respectively. Deodorizing effect by triangle test explained the decrease of acetic acid and ammonia better than those by category scaling or magnitude estimation while high cost and time consuming labor involved in triangle tests reduced the merit. The results of this study demonstrated that various sensory methods could be used to measure deodorizing effect of air conditioners and further researches on fast and reliable methods are needed to establish the official procedures.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A focus group study was performed to investigate the sensory vocabulary used by consumers of this product, together with general habits of its consumption. A total of 59 housewives distributed among six groups from three different cities in Argentina participated in the study. Differences in the groups across cities were small. Four groups would have been sufficient to generate the information and four was an adequate number of samples to aid in descriptor usage. The total number of descriptors used by the 6 groups were: appearance 65, color 39, aroma 44, flavor 50 and texture 70. A list of the most frequently mentioned positive and negative descriptors is presented. There were contradictions between the recall of reasons for consuming a sample and the sensory description of the same sample. The focus group method allowed obtaining the general profile of an ideal mayonnaise: pale yellow, shiny, with a mild flavor of lemon and egg, creamy in texture and easy to spread.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In the present paper, two indices, agreement coefficient and reliability coefficient, are introduced and proposed to measure quality of ratings data given by a sensory descriptive panel. Agreement coefficient describes variation of ratings for a single target (product), whereas reliability coefficient reflects discrimination ability of a descriptive panel for a sample of products. The two indices, which profoundly describe inherent characteristics of ratings data, are based on classical reliability theory and recent advances in psychological measurement. In the paper, estimates and tests for the two indices are provided. Confidence intervals for the indices are derived. A space with the two indices as dimensions, which is referred as rating quality space, gives visual presentation of performances of a descriptive panel or individual panelists. Numerical examples illustrate the use and interpretation of the indices.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Anderson's statistic, which compares distributions of ranks, is generalized to cope with tied rankings. A simple example is given to illustrate the calculations involved. In market research work it is often important to compare distributions as well as mean values. Comparison of distributions can indicate either market segmentation or product variability.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: FOOD TEXTURE AND VISCOSITY, CONCEPT AND MEASUREMENT by Malcolm Bourne.
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Asian white radish processed foods are commonly consumed in Japan and Korea and are increasingly available in many Western countries. The major flavor constituent of Asian white radish, 4-methylthio-3-trans-butenyl isothiocyanate (MTBITC), was extracted as an oil and added in varying concentrations to an unflavored cracker biscuit. Untrained taste panels of Japanese, Korean and Australian nationals were presented with treated biscuits and their concentration preference for MTBITC determined. The taste preferences (degree of liking) of the Japanese and Koreans differed markedly with the Japanese preferring biscuits containing 110 μmole MTBITC/100 g while the Koreans preferred 〈 50 μmole/100 g (the lowest concentration tested). The difference is attributed to the Korean use of Asian white radish in highly spiced foods compared to the Japanese use without the addition of strongly flavored ingredients. The Australians also preferred 〈50 μmole/100 g but this was probably due to unfamiliarity with eating white radish.
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  • 41
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    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : A limited sampling and analysis of commercial supplements found 51% to 124% eicosapentaenoic acid (EPA) and 61% to 153% docosahexaenoic acid (DHA) as provided on product labels. Daily intakes of EPA plus DHA from label recommendations would provide 123% to 1087% of the adequate intake (AI) for pregnant and lactating women (that is, 0.13 to 0.14 g/day) and up to 43% of the daily reference dose (RfD) for polychlorinated biphenyls (PCB) for a 60-kg person. However, if a smaller dose of the supplements were taken to meet the AI, only 0.9% to 11.5% of the RfD for PCB would be obtained. Algal oil supplements did not have detectable PCB residues, but those products only provided DHA and not EPA.
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    Journal of food science 68 (2003), S. 0 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Results show that the variables studied in this work increased to a greater extent in a 1st stage (wine exposed for 4 y to daily temperature fluctuations) than in a 2nd stage (wine held at a constant temperature of approximately 17 °C up to the 14th year). To study aging under more controlled conditions, a 2-stage laboratory experiment was carried out (the 1st ranging from 15 to 30 °C, the 2nd at 30 °C). The results revealed an important acceleration in the aging of this type of wine. However, aroma and flavor properties were slightly affected, probably because of the higher temperature maintained during the 2nd stage.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : The goals of this study were to measure moisture migration in a porous solid matrix simulating a real food (flour dough) and to accomplish heating of the solid matrix. An off-line technique and a microwave temperature controller system were developed for measuring moisture concentration under isothermal heating condition. A temperature profile of a cylindrical dough sample was achieved by accurate control of microwave energy input and preheated carrier gas temperature. Results showed a simplified 1st order kinetic model adequately predicted moisture loss in dough samples. Effect of temperature on the rate constant was adequately modeled by the Arrhenius relationship. The rate constant was found to be affected by porosity of the dough sample.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : High pressure-assisted thawing (HPAT) and high pressure-induced thawing (HPIT) experiments were performed in agar gel samples at different pressures (50 to 210 MPa) and initial temperatures (−5°C to −20 °C). Lower pressures and temperatures yielded HPAT processes in which the sample temperature increased during pressurization because no melting took place. The complete phase transition occurred during the holding time. Higher temperatures and/or higher pressures yielded HPIT processes in which partial melting occurred during pressure loading, causing the sample temperature to decrease. In practice, whether HPAT or HPIT took place depended on the initial temperature of the sample for a given pressure value. Common situations were nonhomogeneous thawing processes.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : The antilisterial effect of low-fat sausages (〈2%) manufactured with a fat replacer and increased level of sodium lactate (SL, 60%) solution was determined during refrigerated storage after inoculation with 103 colony-forming units/g of Listeria monocytogenes (LM) at the initial storage. The fat replacer prevented moisture loss during cooking or storage. Increased SL in combination with the fat replacer resulted in lower water activity, total plate, and LM counts. In addition, whiteness values decreased (P 〈 0.05), but yellowness values increased (P 〈 0.05) with increased SL level. During storage, low-fat sausages containing at least 3.3% SL and the fat replacer had greater antilisterial effect than the low-fat control.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Three species of cephalopods: volador (Illex coindetii), pota (Todaropsis eblanae), and octopus (Eledone cirrhosa) were classified according to sex, stage of sexual development, and anatomical zone for characterization and functionality of their muscle proteins. The 3 species exhibited very similar levels of total protein. Octopus mantles and arms contained the least proline and the most hydroxyproline. The highest solubility values in immature pota coincided with the lowest apparent viscosity and emulsifying capacity values. The highest insolubility values observed in octopus coincided with the highest viscosity and emulsifying capacity values. However, in volador which exhibited an intermediate solubility, viscosity was very high and emulsifying capacity was very low.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : This study explores the possibility of distinguishing raw and reconstituted milk by stable isotope ratio mass spectrometry. Considering variations from different areas and seasons, milk and groundwater samples were collected from dairy farms in different seasons to measure δD and δ18O values. Results showed differences between raw and reconstituted milk prepared with groundwater from a laboratory and a farm. The plot of values in each mixed level of raw and reconstituted milk had a correlation coefficient 〉 0.9. Data showed raw milk is related to the groundwater from that farm. We concluded that the charcoal treatment method is a suitable method for large-scale monitoring of raw milk samples. The measurement of δD and δ18O values in raw milk and groundwater provides a reference to detect adulteration.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Activities of 2 membrane-bound enzymes, Ca2+-ATPase from the sarcoplasmic reticulum and cytochrome oxidase from the inner mitochondria membrane, were measured during frozen storage of cod. Enzyme activities were higher in cod muscle samples frozen at −30°C than at −20°C. Freezing-induced activation of both enzymes was observed and the activation was amplified by ice storage prior to freezing. Sensory evaluation conducted at 9 mo of frozen storage showed differences between the sensory properties of cod frozen immediately after catch and frozen after 3 d of storage on ice. These results indicated that the enzymes might be useful as indicators of quality changes by frozen storage.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : It is hypothesized that a dynamic vapor sorption instrument coupled with an atmospheric pressure chemical ionization mass spectrometer (APCI-MS) may be useful for rapid analysis of volatile release from dry food materials. Preliminary data from a related system (Vapor Generator Instrument-APCI-MS) was used to monitor release of volatiles from spray-dried food polymers as a function of relative humidity at 40 °C. The system demonstrated differences in volatile release as a function of volatile compound, relative humidity, and food polymer. Comparison of these data with data collected using traditional shelf life study methodologies, and concerns for the ability of the method to accurately reflect time-dependent changes are discussed.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Oxidative stability of docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) and volatile and oxidized volatile compounds in 2 types of DHA-enriched fish oil, triacylglycerol (TG) and ethyl ester (EE), were studied during storage at 80 °C with aeration. The rate of DHA autoxidation was higher than that of EPA. DHA in EE form was more susceptible to autoxidation than in TG form. Thirty-one volatile compounds were identified in EE and 23 volatile compounds in TG. (E)-2-pentenal, 2-(1-pentenyl) furan, and (E,E)-2,4-heptadienal were commonly detected as oxidized volatile compounds from TG and EE fish oil. These volatile oxidized compounds might be formed mainly from the oxidation of DHA and EPA, the main fatty acids of the oil.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : The functional, nutritional, and antioxidative properties of hydrolyzed herring and herring byproducts (head and gonad) were evaluated. All freeze-dried herring fish protein hydrolysate (FPH) powders were light yellow and contained 77% to 87% protein. The degree of hydrolysis was 18.3%, 13%, 13%, and 10.1%, respectively, for head, whole fish, body, and gonad after 75 min digestion. All FPH powders had desirable essential amino acid profiles and mineral contents. The emulsifying capacity and stability of all FPH powders were lower than those of egg albumin and soy protein; the fat adsorption was comparable to that of egg albumin. The antioxidative activity of whole herring FPH was highest, followed by that of body, gonad, and head.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Free radical scavenging and antioxidant activities of irradiated phytic acid at various concentrations were studied. Phytic acid sodium salt dissolved in deionized distilled water was irradiated at 0, 5, 10, 15, and 20 kGy. The degradation of phytic acid by irradiation was observed, and it was found that the concentrations had an effect on the degree of degradation. Stable 2,2-diphenyl-1-picrylhydrazyl radical scavenging ability of phytic acid was significantly increased by irradiation (P 〈 0.05) and was positively correlated with irradiation dose (P 〈 0.01). Antioxidant activity of phytic acid in lipid model systems was slightly increased by irradiation; however, at higher concentrations, the activity was reduced or was the same compared with nonirradiated phytic acid.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : The ultrastructure of pecans was investigated using light microscopy, environmental scanning electron microscopy, scanning electron microscopy, and transmission electron microscopy. Specific methodology for the sample preparation of pecans for electron microscopy investigations was developed. Electron microscopy of the ultrastructure of opalescent (discoloration of the interior) and nonopalescent kernels revealed that cellular damage was occurring in opalescent kernels. The damage was due to cell wall and membrane rupture, which accounted for the release of oil throughout the kernel. This rupture is due to the lower level of calcium in the cell membranes of opalescent pecans, as shown by energy dispersive X-ray spectrometry, making them more susceptible to damage.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : The diffusion properties of curdlan gels were characterized against its viscoelastic behavior. With increased junction zones involved in rigid crosslinks in higher concentration gels, the three-dimensional structure of curdlan is characteristic. As the gel concentration increases, the intermolecular crosslinking and apparent viscosity increase, reducing mobility of the polymer chains with slower release rates. The scaling laws confirmed that curdlan gel network structure corresponds to that of polymer chains in a good solvent at the semi-dilute regime. Diffusion of the entrapped agent in 6% gels resembled pseudo-controlled release behavior, and a further increase in gel concentration might produce microspheres that support a sustained release.
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  • 55
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    Journal of food science 68 (2003), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Ground beef Semimembranosus muscle was inoculated with Escherichia coli, and aliquots were left raw or cooked to 1 of 24 time/temperature combinations. Samples were analyzed by aerobic plate counts for surviving bacteria, total extractable protein, and immunoblot quantification of lactate dehydrogenase isozyme 5 (LDH5). Bacterial thermal death curves exhibited a consistent log decline with increasing temperature and cooking times at a given temperature, which were paralleled by decreases in LDH5 at 61 °C and above. Total protein exhibited a linear time/temperature decline. Immunologic analysis of LDH5 may be suitable for development into a rapid assay method for the verification in beef of cooking endpoint temperatures from 61 °C to 69 °C.
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  • 56
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    Journal of food science 68 (2003), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Binding of sodium cholate, sodium taurocholate, and sodium glycocholate by guar gum, soluble oat fiber, xanthan gum, and inulin was studied. All soluble fibers were able to bind sodium cholate, sodium taurocholate, and sodium glycocholate from a mixture of the three, but when tested individually, the fibers bound little or no sodium cholate. In general, the fibers bound higher concentrations of conjugated bile salts than they did free bile salts. Soluble oat fiber, which bound as much or more sodium cholate and sodium glycocholate as did the other 3 fibers, was tested for its effect on deconjugation of glycocholate by Lactobacillus acidophilus and Lactobacillus casei. The presence of the fiber significantly increased (P 〈 0.05) deconjugation by all cultures.
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  • 57
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    Journal of food science 68 (2003), S. 0 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : The thermal evolution behavior of the organic free radicals induced in irradiated black pepper was studied by electron spin resonance spectroscopy. To analyze the time-dependent evolution process, we used the theory of transient phenomena, that is, an ordinal differential equation, as well as the nonlinear least squares numerical method. We found that the radical evolution that occurred in the irradiated pepper obeys a single exponential function and yields a unique time constant. The evolution of the organic free radical undergoes a simple reaction process of a single radical species.
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  • 58
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    Journal of food science 68 (2003), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Noncontact ultrasound parameters, such as velocity and attenuation coefficient, were directly measured using air instability compensation transducers and correlated with Young's modulus, hardness, and toughness of different types of cheeses. Ultrasound velocity was highly correlated with the mechanical properties of cheeses whereas no significant relationship between the ultrasound energy attenuation coefficient and the mechanical properties were shown. The noncontact ultrasound technique demonstrated excellent performance for thickness measurement of cheeses with an accuracy of 99.98% (standard error = 0.089 mm). Results indicated that noncontact air instability compensation ultrasound technique has a good potential for nondestructive and accurate measurement of ultrasound parameters, thickness, and mechanical properties of food materials.
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  • 59
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    Journal of food science 68 (2003), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : The interaction between probiotic (Enterococcus spp., Lactobacillus spp., and Lactococcus spp.) and enteric (Bacteroides spp., Escherichia coli, and Salmonella spp.) bacteria with respect to menaquinone production was examined. Menaquinones were measured in cell pellets by high-pressure liquid chromatography and the main homologues produced were MIK7–11. The growth of both Bacteroides and E. coli cultured with the 3 probiotics was significantly inhibited with concomitant reduction in menaquinone production. The vitamin K status of humans could be affected by consumption of probiotic dairy foods via the contribution made by gut microflora.
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  • 60
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : The recovery of 5 pathogens from minced chicken (MC) and liquid whole egg (LWE) was determined with tryptone soya agar (TSA), selective medium, and thin agar layer (TAL; selective medium overlaid with TSA) to evaluate high-pressure effects at 200, 300, 400, and 500 MPa for 1 and 5 min at 20 °C. At 400 MPa for 5 min, Escherichia coli inactivation was 4 log in MC and 5.5 log in LWE, whereas no Salmonella Typhimurium, Yersinia enterocolitica, or Listeria monocytogenes were detected in either product. Staphylococcus aureus was the most pressure-resistant. In general, counts on the 3 media were not different. The TAL method allows differentiation of the inoculated pathogens from background microbiota.
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  • 61
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : The quality characteristics of cured ham, treated with ionizing radiation (4.5 kGy) at different points in the curing process, were compared during a 90-d storage period. Irradiation treatments included irradiation of raw uncured ham, raw-cured ham, cured cooked ham, and a nonirradiated control. Irradiation processing increased lipid oxidation for all treatments. The raw-cured treatment resulted in significantly lower L* values compared with the control regardless of storage period. All treatments except for cured cooked ham had lower b* values over the storage period. Irradiation of cured cooked ham resulted in higher off-odor scores than all other treatments immediately following irradiation thus indicating a change in quality.
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  • 62
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  • 63
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Antimicrobial activity of salsa mexicana against Escherichia coli, Klebsiella pneumoniae, Bacillus subtilis, Bacillus cereus, Staphylococcus aureus, and Saccharomyces cerevisiae was studied. The pressed salsa juice suppressed completely the growth of E. coli, B. subtilis, and S. aureus. K. pneumoniae and B. cereus were suppressed partly but Saccharomyces cerevisiae was not suppressed at all by the juice. Three types of microbicidal or microbiostatic components have been found: (1) H+, (2) volatile compounds, and (3) non-ionized carboxylic acids or analogous compounds. It is proposed that the supplementation of stink bugs in the salsa seen widely in the south of Mexico is used to intensify the herbal odor of the salsa.
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  • 64
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    Journal of food science 68 (2003), S. 0 
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    Notes: : The objective of this project was to treat fresh-cut apple slices with the ethylene inhibitor 1-methylcyclopropene (1-MCP) to retard ethylene-induced deterioration and senescence and to prolong the shelf life of such products. Intact Braeburn and Pacific Rose apples were treated at different times with 1-MCP, cut, and stored at 0 °C. Samples were analyzed initially and then weekly for ethylene, respiration, flesh firmness, tissue color, titratable acidity, and soluble solids content during 5 wk of storage. 1-MCP treatment was effective in reducing ethylene production, respiration, and loss of firmness and color of slices when applied to whole apples directly after harvest. Total sugar and acidity levels were not affected significantly.
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  • 65
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Changes in chlorophyll and carotenoid contents of fried dough supplemented with spinach (Spinacia oleracea) powder were investigated during storage. Flour dough containing spinach powder was fried in soybean oil at 160 °C for 1 min and stored in a glass bottle at 60 °C incubator in the dark up to 12 d. Chlorophyll contents decreased with storage time, whereas pheophytin contents increased followed by decrease. Decomposition of chlorophyll a was faster than that of chlorophyll b. Carotenoids were decomposed during storage; however, the decomposition rate was lower than that of chlorophylls. Decrease in carotene contents with storage time was slower than that in xanthophylls.
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  • 66
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    Notes: : The bacterial bioluminescence assay was used to determine the acute toxicity level of beauvericin, which was found to be moderate with an EC50 of 94 ± 9 μg/ml. The Ames test was used to evaluate mutagenicity of this mycotoxin. Assays were carried out on 5 Salmonella typhimurium standard tester strains. The spot test was performed on a single beauvericin concentration of 2 μg/plate. The plate incorporation test was done over a range of concentrations (0.2 to 500 μg/plate), both with and without S9. A negative control and 3 positive controls, 2-aminofluorene, sodium azide, and dexon, were included in the assays. Beauvericin was nonmutagenic to any of the standard tester strains used, either with or without metabolic activation.
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  • 67
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    Notes: : The application of conjugated linoleic acid (CLA) as a functional ingredient has been limited due to the high cost of purification and its water-insoluble nature. In this study, high-purity CLA was obtained from safflower oil and a hydrophilic form of CLA was produced by complexation with arginine (Arg). CLA was prepared by alkali-isomerization and purified up to 95% using urea-inclusion crystallization. Total purified CLA comprised 41% and 50% of cis-9, trans-11 and trans-10, cis-12 isomers, respectively, with 35% recovery. Arg was attached to the carboxyl end of CLA. Optimum weight ratio of CLA to Arg was 1.7 and yield was 91%. Arg-CLA complex could expand the scope of CLA application in various food industries.
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  • 68
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Our research determined whether chelators could influence physical location and prooxidative activity of lipid-phase iron in oil-in-water emulsions. Corn oil saturated with ferric ions was used to produce polyoxyethylene 10 lauryl ether-stabilized oil-in-water emulsions. Continuous-phase iron concentrations increased with increasing chelator concentrations (10 to 100 μM) and storage time (1 to 7 d). At pH 3.0, the concentration of continuous-phase iron was higher in the presence of EDTA and sodium tripolyphosphate (STPP) than citrate. STPP and EDTA were more effective than citrate at inhibiting lipid oxidation at pH 3.0. These results indicate that chelators can increase the transfer of iron in lipid to the aqueous phase, thus altering its prooxidant activity in oil-in-water emulsions.
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  • 69
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    Notes: : Elongational flows occur in the mouth when soft foods are ingested. Under those deformations, the food structure changes and influences the sensory perception in the mouth. To understand better how food structure deforms under elongational flow at the micrometer-length scale, a new configuration has been developed including a confocal microscopy and a compression apparatus. A model food system was studied, and the origin of elongational flow defined as the stagnation point was observed during biaxial extension. Repetitive deformations as they occur in the mouth during chewing showed structural evolution in the food system.
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  • 70
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Texture parameters of commercial natural cheddar cheese were tracked over the maturation period (11-mo) but not to evaluate optimal or desirable characteristics. Large strain analysis was performed using the TA-XT2 Texture Analyzer. Monitoring of chemical composition and degree of proteolysis and the solid proportions of milk fat were undertaken with differential scanning calorimeter. Fracture properties, force, and degree of compression confirmed a reduction in cheese firmness and an increase in cheese crumbliness during maturation. Increases in the concentration of small peptides, indicating enhanced proteolytic activity, and an increase in the proportion of solid fat at 21 °C late in maturation were considered primarily responsible for the changes recorded in cheese texture.
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  • 71
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Ground beef Semimembranosus muscle was prepared in neutral phosphate buffer containing sodium chloride (0% to 3%) with and without 0.5% sodium tripolyphosphate (STPP). Extracts were cooked to end point temperatures of 58 °C to 65 °C, and aliquots were analyzed for total soluble protein and immunoblot quantification of lactate dehydrogenase isozyme 5 (LDH5). More protein was solubilized in the presence of STPP, with all extracts exhibiting a linear decline in total protein with temperature. LDH5 showed parallel log decreases with temperature, which were lowered by increased salt and moderated by STPP. The presence of brine ingredients must be considered when using LDH5 to verify end point cooking temperatures in beef.
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  • 72
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Growth of some probiotic bacteria was significantly improved in milk supplemented with whey protein hydrolysate (WPH). However, WPH had no effect on the growth of Lactobacillus delbrueckii ssp. bulgaricus 18, L. delbrueckii ssp. bulgaricus 10442, and Streptococcus thermophilus 1. When the probiotic bacteria were grown in combination with different yogurt cultures in milk, WPH caused significant increases in growth of Bifidobacterium longum S9, L. acidophilus O16, and L. acidophilus L-1. However, by day 28 of refrigerated storage, the populations of the probiotic cultures that had been grown in samples supplemented with WPH were similar or below those in the control samples.
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  • 73
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    Notes: : The effects of erythritol on physical and sensory characteristics of chiffon cakes were studied. The results showed that chiffon cakes prepared with 25%, 50%, 75%, and 100% replacement of sucrose with erythritol were lighter in crust and crumb and less sweet in crumbs than those with sucrose. There were no differences in the specific gravity of cake batter, volume, and moisture content between cakes prepared with sucrose or erythritol. Results from sensory evaluation also showed no significant differences in crumb color, moistness, and tenderness for any cakes.
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  • 74
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    Notes: : The anti-Listeria monocytogenes effects of 8 phenolic compounds, carnosol, carnosic acid, 12-methoxy carnosic, ferulic and caffeic acid, rosmarinic acid, luteolin and luteolin-7-glucoside were evaluated with a Plackett and Burman design in mixtures mimicking the phenolic composition of rosemary extract without essential oils. At 30°C carnosic acid was the most efficient compound during 24 h, whereas luteolin became more active after 72 h. The antibacterial effect of pure carnosic acid was modeled under a range of different pH and NaCl concentration, using a Doehlert design. Under moderately acidified conditions, carnosic acid displayed a bactericidal effect at low concentration (5.5 μg/ml). Its activity was not greatly influenced by NaCl.
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  • 75
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : The modeling of microbial growth behavior is of great relevance to the control of many industrial processes. In this work, a deterministic model to predict the growth curve of microorganisms, from inoculation to death, is presented. To validate the model a Saccharomyces cerevisiae strain has been used to conduct wine fermentation tests at 25 °C and at 2 different values of initial nitrogen concentration. Cell, nitrogen, ethanol and sugar concentration were monitored over a period of about 1200 h. The proposed model was simultaneously fitted with success to the 4 sets of available data. Moreover, due to the mechanistic structure of the proposed approach, it was possible to quantitatively describe the evolution of R1(t), R2(t), dE(t)/dt, dN(t)/dt, and dS(t)/dt during wine fermentation.
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  • 76
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    Notes: : A recombinant Saccharomyces cerevisiae wine yeast strain expressing the Candida molischiana bgln gene encoding a β-glucosidase (BGLN) has been used to produce this enzyme. Shaking rate, pH, and aeration rate conditions have been optimized to obtain maximum activity to facilitate enzyme purification. The ability of the heterologous enzyme to efficiently release terpenols and alcohols from a Muscat wine glycoside extract and also directly from wine has been demonstrated. Terpenol glycoside content decreased by 50% after 1 mo of wine storage in agreement with results reported for the β-glucosidase produced by C. molischiana.
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  • 77
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    Notes: The effects of raisins on iron bioavailability from wheat bran cereal, bread, rice pudding, and granola bars were studied. Iron bioavailability was assessed with an in vitro digestion/Caco-2 cell culture model. Raisins reduced iron bioavailability from all foods except granola bars. Raisins also reduced iron bioavailability from samples of wheat bran cereal and bread fortified with elemental iron or ferrous sulfate, but this inhibitory effect was less pronounced in samples fortified with sodium iron ethylenediaminetetraacetate (NaFeEDTA). Iron bioavailability was markedly higher for samples fortified with NaFeEDTA, suggesting that iron in the form of NaFeEDTA is more bioavailable than elemental iron or ferrous sulfate in raisin-containing foods.
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    Notes: A biparameter sensor using flow injection with solid-phase spectrophotometry for the simultaneous determination of butylated hydroxyanisole (BHA) and n-propyl gallate (n-PG) in fatty foods and cosmetics is proposed. The method is based on different transient retentions of these antioxidants when carried with methanol-water 30:70%, vol/vol, through a flow cell packed to a 25-mm height with C18 silica. Each antioxidant was determined by measuring its intrinsic absorbance at its residence time (40 s at 272 nm for n-PG; 200 s at 288 nm for BHA; calibration: 5.0 to 300.0 μg/mL; RSD: 1.7%) by flow technique and diode-array detector. Resolution of the BHA-n-PG mixture in ratios between 1:10 and 10:1 is possible.
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    Notes: : Fat controls the intensity and the release rate of volatile compounds because of its solvent property. Our objective was to understand the effect of fat on the flavor release behavior exhibited while ice cream is eaten. The temporal flavor profiles of ice creams, which contained various fat levels and were spiked with known amounts of selected volatiles, were determined by a temporal modified purge and trap and time-intensity analyses. Stale and cherry flavors were released faster and at higher intensities as fat content decreased. Fat had the opposite effect on vanilla flavor release. Temporal modified purge and trap analysis was an effective method to observe the release of some flavor compounds.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper proposes a concept based on applying postharvest abiotic stresses to enhance the nutraceutical content of fresh fruits and vegetables. We hypothesize that selected abiotic stress treatments, such as wounding, phytohormones, temperature, ultraviolet light, altered gas composition, heat shock, and water stress, among others, will affect the secondary metabolism of fresh produce and increase the synthesis of phytochemicals with nutraceutical activity or reduce the synthesis of undesirable compounds. Controlled stresses may be used as tools by the fresh produce industry to enhance the health benefit properties of fresh-cut or whole fresh produce and by the food processing and dietary supplement industries to obtain healthier processed products or enhance extractable nutraceutical yields.
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    Notes: Chemical compositions, physical properties, and suitability for starch noodle making of different granule size fractions from potato and sweet potato starches were studied. The ash content, amylose content, phosphorus content, gel firmness, and freeze-thaw stability of small-size granule fractions(〈 20 μm) were significantly different from those of the large-size granule fractions. The processibility and the qualities evaluated by objective and subjective methods of both dried and cooked starch noodles made from small-size granule fractions were significantly better than those made from their initial starch preparations and much better than those made from the large-size granule fractions.
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    Notes: : Natrolite was used to explore a physical and safe method to decontaminate aflatoxin-containing pistachio lots. Pistachio nuts with low, medium, and high levels of aflatoxin were subjected to a washing process with a slurry of 5% natrolite. Using thin-layer chromatography and scanning, the aflatoxin contents of the samples were measured. Aflatoxins B1 and B2 were found in pistachio nuts. The majority of total aflatoxins was aflatoxin B1 Natrolite treatment resulted in a 38% to 100% reduction in aflatoxin B1, depending on the initial aflatoxin level. Although natrolite was demonstrated to be an effective candidate to reduce aflatoxin B1, its efficacy against aflatoxin B2 was limited.
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : This study was conducted to determine the fatty acid (FA) compositions and oxidative stabilities of cold-pressed cranberry, carrot, hemp, and caraway seed oils. The cold-pressed cranberry and hemp seed oils exhibited higher α-linolenic acid (18:3n-3) contents with levels of 22 and 19 g/100 g fatty acids, respectively. Cold-pressed carrot seed oil contained about 82% oleic acid and had the lowest total saturated fatty acids among all tested oils. Cold-pressed caraway seed oil had the greatest oxidative stability with an OSI value of 150 hours. In addition, cold-pressed carrot seed oil had the lightest color while hemp seed oil was the darkest among all the oils tested.
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    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Effects of commercial-scale pulsed electric field (PEF) processing on the microbial stability, ascorbic acid, flavor compounds, color, Brix, pH, and sensory properties of orange juice were studied and compared with those of thermal processing. Freshly squeezed orange juice was thermally processed at 90 °C for 90 s or processed by PEF at 40 kV/cm for 97 ms. Both thermally processed and PEF-processed juices showed microbial shelf life at 4 °C for 196 d. PEF-processed juice retained more ascorbic acid, flavor, and color than thermally processed juice (P〈0.05). Sensory evaluation of texture, flavor, and overall acceptability were ranked highest for control juice, followed by PEF-processed juice and then by thermally processed juice (P〈0.01).
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  • 85
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    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effects of fish protein hydrolysis time and fish solids level on macroscopic properties of extrudates were investigated. Arrowtooth flounder muscle was autolyzed for varying times; hydrolyzed muscle was recovered, dried, blended with rice flour at varying levels, and extruded using a twin-screw extruder. Hydrolysis beyond 5 min had little effect on extrudate properties. Addition of hydrolyzed fish solids strikingly decreased the apparent density and breaking strength but increased extrudate porosity and expansion ratios. In general, the effect was greater when the level of fish solids was higher. Opposite and expected trends were observed for blends with unhydrolyzed fish solids. Fish solids level played a dominant role in increasing true density.
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  • 86
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Design of active modified atmosphere packaging for vegetables was studied by developing a mathematical model predicting gas changes and based on the following independently evaluated parameters: vegetable respiration rate, film permeability, and oxygen absorption kinetic of the absorber. A step-by-step model validation was performed on a tomatoes/low-density polyethylene pouch/commercial iron-based scavenger system at 20 °C. Without optimization, the model fit experimental data with root mean square error (RMSE) value lower than 1.5. Oxygen absorbers had a strong influence on transient period characteristics by reducing their duration (50 and 100 h with and without absorber, respectively) and suppression of the CO2 peak owing to a rapid oxygen depletion.
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  • 87
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: High-pressure (HP) destruction of Escherichia coli (29055) in apple juice was evaluated (150 to 400 MPa; 0 to 80 min at 25 °C) based on a dual destruction behavior consisting of pressure pulse and pressure hold (first order rate) effects. Enumeration was carried out in brain-heart infusion agar (BHIA) and violet-red bile agar (VRBA) to differentiate between surviving cells with and without injury. A pressure pulse at 400 MPa destroyed the entire population (108 CFU/mL) of E. coli. During pressure-hold, D values (decimal reduction time) of E. coli decreased with an increase in pressure, and D values from BHIA (survivors including injured cells) were higher than from VRBA (survivors excluding injured cells). Thus, an increasing number of cells were initially injured than killed with HP treatment until finally killed. Pressure dependency of D was described by z-value model with associated zp values (pressure range to result in a decimal change in D values) of 126 and 140 MPa on BHIA and VRBA.
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  • 88
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Gas exchange modified atmosphere packaging (GEMAP) with display gas of 80% O2:20% CO2 retarded microbial growth and improved color stability of ground beef patties compared with vacuum packaging (VP) followed by air-permeable polyvinylchloride (PVC) overwrapping during 3 d of retail display. Predominant microorganisms for GEMAP were Pseudomonas, Yersinia, Aeromonas, and Enterobacter and for VP-PVC were Pseudomonas, Brochothrix, Aeromonas, Enterobacter, Moraxella, and Lactobacillus. Lower levels of pathogens were isolated in GEMAP samples with 7 °C than 15 °C display temperature. Patties were darker (lower L*) with those with 15 °C than with 7 °C display and redder (higher a*) in GEMAP than VP-PVC. Good manufacturing practices should be followed with MAP meat to reduce the risk of pathogenic microbial growth.
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  • 89
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    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Breadmaking properties, such as bread height and specific volume, were improved in bread, made with wheat flour blended with Welsh onion (Allium fistulosum L.) powder, which is high in di-n-propyl disulfide (Pro2S2). Breadmaking properties also were improved in bread prepared from wheat flour blended with Pro2S2 alone. Brabender farinographs of Welsh onion powder/wheat flour and Pro2S2/wheat flour showed interesting properties in modifying the width of the tail. Size-exclusion high performance liquid chromatography of the wheat proteins in the control and blended flours showed a profile of low, medium, and high molecular weight peaks. The area of the high molecular weight peak was larger in the 2 blended flours than in control, indicating this protein was important for the improvement.
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  • 90
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Relationships between 2 instrumental and 2 sensory methods for cookie color assessment were determined. For sensory tests, panelists (n = 8 to 10) compared color of cookies (3 formulations × 2 cookie types) to equidistant physical color references in a light booth and to digital color references in a sensory workstation using unstructured line scales. For instrumental methods, the CIELAB color model and hue angle were determined with a spectrophotometer and with graphics software using digital camera images. Analysis of variance (ANOVA) and post-hoc comparisons verified differences (P 〈 0.05) among formulations within type by all methods. Except for b* values of chocolate chip cookies, the potential of all color assessment methods were validated by strong linear relationships (r 〉 0.94; P 〈 0.001).
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  • 91
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    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Two types of lemon albedo (raw and cooked) at 5 concentrations (0% to 10% in 2.5% increments) were added to dry-cured sausages, and compositional, textural, and sensory analyses were conducted on finished products. The addition of albedo provided an improvement in nutritional properties from fiber addition and may have beneficial effects due to the presence of active biocompounds as evidenced by a decrease in residual nitrite levels and delayed oxidation (based on CIE redness values). Products with sensory properties similar to control sausages were those that contained 2.5% raw albedo and 2.5%, 5%, and 7.5% cooked albedo.
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  • 92
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    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: We evaluate the effect of high moisture content (MC) stored maize grain on tortilla quality and on the growth of toxigenic fungi. Maize with a MC of 18% was stored for 10, 15, and 20 d at 28 °C. The control seed was stored 20 d with a MC of 10.7% at 4 °C. The high MC grain and the control were processed using the traditional nixtamalization process. Storage conditions had a significant effect on tortilla quality parameters such as pH, color, tensile strength, cut force, viscosity peak, starch retrogradation (setback), and aflatoxin contamination. Tortillas produced with high MC grain presented a lower quality than those produced with low MC grain.
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  • 93
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Nutritional composition was determined for Spirulina platensis, Chlorella vulgaris, and Isochrisis galbana cultures. Data include the proximate composition, energy value, mineral elements, and fatty acid composition. Sixteen strains of these microalgae were obtained as a percentage of total fat. Total PUFA, SFA contents, n-3/n-6 ratios, and eicosapentaenoic acid (EPA)/docosahexaenoic acid (DHA) ratios were obtained. Protein content was high in Spirulina samples, whereas Isochrisis had the highest ash content. Spirulina is a rich source of γ-linolenic acid (GLA); Chlorella was an important source of PUFAs. Spirulina is a rich source of K, Chlorella is rich in P, and Isochrisis is a good source of Ca and Mg. Se content of Isochrisis is higher than in the other microalgae.
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  • 94
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    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Ocean-ranched and farm-reared Atlantic salmon were compared on the basis of compositional and functional/mechanical properties of the raw and the corresponding smoked muscle. Several procedures based on different salting methods (brine and dry salting) and smoking temperature (20 °C and 30 °C) were tested, as well as an electrostatic smoking method. Also, raw material samples were studied without and with frozen storage (-20 °C) for 30 d prior to salting/smoking, and the effect of frozen storage on the smoked muscle was evaluated. The electrostatic method induced considerably lower shear force values than the other smoking treatments. Ocean-ranched salmon were more susceptible to protein aggregation and loss of binding properties (water and fat) than farmed fish as a consequence of frozen storage of the raw material or smoking treatment.
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  • 95
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    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : The pH of pulp-free juice (PFJ) from Valencia oranges was adjusted, ultracentrifuged to produce serum (UCS) and pellet (UCP), and stored at 4 °C for 11d. The UCS and PFJ had no pectinmethylesterase (PME) activity. Floc (UCF) in the UCS appeared at the same time as the %T increase in PFJ. Presumptively, PME peptides at 13-, 20-, 27-, and 36-kDa were in UCF and UCP. The UCS had no protein. Soluble (in UCS) and insoluble (in PFJ) proteins are involved in clarification. Steric stabilization and charge repulsion at pH 7 delays clarification. Increased charge, loss of steric stabilization, and loss of charge repulsion of juices readjusted from pH 7 to natural pH led to accelerated clarification.
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  • 96
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    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Change in tilapia myosin molecular conformation due to pressurization at 50 to 200 MPa for 0 to 60 min was investigated. After a 50-MPa treatment, tilapia myosins slightly decreased their total sulfhydryl contents and exposed their hydrophobic residues. Experimental results indicated that 100- and 150-MPa treatments caused an apparent unfolding of myosins and a 1-fold increase of their surface hydrophobicity (So). Myosins mainly formed intermolecular disulfide bonds with pressures of 100 to 200 MPa. In addition, increasing pressures altered the myosin conformation and decreased its Ca-ATPase activity. Myosin apparently unfolded and formed disulfide bonds and hydrophobic interactions with pressurizing at 150 MPa.
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  • 97
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Fresh Cheddar cheese whey batches from 2 processing plants and 4 starter culture rotations were extracted with diethyl ether followed by isolation of volatiles by high-vacuum distillation. Odorants were evaluated by gas chromatography-olfactometry (GCO) and aroma extract dilution analysis (AEDA). 2,3-butanedione (buttery), hexanal (green), 2-acetyl-1-pyrroline (popcorn), methional (potato), (E,E)-2,4-decadienal (frying oil) and (E,E)-2,4-nonadienal (frying oil) were potent neutral/basic aroma-active compounds identified in all whey samples. Odor intensities of hexanal, (E,E)-2,4-nonadienal, 2,3-butanedione, and (E,E)-2,4-decadienal were variable. Short-chain volatile acids were predominant in acidic fractions and their intensities differed among the whey samples. GCO findings agreed with quantitation results. Liquid whey aroma components are influenced by starter culture rotation.
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  • 98
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Lipid oxidation and carotenoids in frying oil and carrot-added dough during frying were studied. Flour dough containing carrot powder was sheeted at 0.1 cm thickness and was then cut to squares to be fried. Each frying was performed in 160°C soybean oil for 1 min and repeated every 20 min for 20 h. Carrot in the dough decreased significantly the oxidative stability of frying oil and fried dough (p 〈 0.05). Carotenoid content in frying oil increased as frying was repeated due to dissolution of carotenoids from the dough containing carrot; however, there was no significant difference in carotenoid content among the dough fried in the oil with different number of fryings.
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  • 99
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    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This study compared effects amino acid structure and type on the pasting properties and crystallinity of rice starch isolated from flour. Amino acids were added at 2 and 6% of the starch (dry basis) for RVA analyses. Charged amino acids had more of an influence on pasting properties than neutral amino acids. Our results indicated that the negatively charged amino acids had a similar effect as that of the positive charged amino acids for decreasing cooking stability of the starch, but opposite effects on retrogradation tendency. Charged amino acids increased the crystallinity of the starch, potentially enhancing resistant starch nature.
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  • 100
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Three major yellow pigments were isolated from safflower petals (Carthamus tinctorius) and characterized as hydroxysafflor yellow A (1), safflor yellow B (2), and precarthamin (3) by 1H-NMR, 1H-1H COSY, 13C-NMR, HMQC, and HMBC spectral analysis. Thermal degradation reactions of 3 yellow pigments 1 to 3 at temperatures of 70 to 90 °C were carried out at different pH levels within the range of 3.0 to 10.0 by UV-vis spectral measurements. First-order reaction kinetics was observed for the degradation of safflower yellow pigments (1 to 3) at pH 3.0 and 5.0. Activation energies of thermal degradation of 1-3 at pH 5.0 were calculated as 17.0, 15.4, and 20.1 kcal/mol, respectively. At neutral and alkaline conditions, yellow pigments 1-3 did not follow simple first-order kinetics.
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