Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"Hexanal"”.
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Efficacy of Odor Scavengers in Reducing Odor Compounds in Water, Milk, and Soymilk
Odor detection thresholds of hexanal, 2-heptenal, 2-pentanone, and 2,4-nonadienal were determined in spring water, high temperature short time (HTST) 2% fat milk, and extended shelf life soymilk. The efficacy of odor scavenger's beta-cyclodextrin, D-sorbitol, and nylon 6 in removing these odors was …
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Preventing Oxidation of Dairy Powders Using Oxygen Removal Packaging
… by instrumental, chemical, and sensory methods. Hexanal concentrations were measured weekly using solid phase microextraction (SPME) and gas chromatography (GC) to compare the degrees of oxidation in the powders stored with the catalyst to those stored without it. Color changes were also …
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The Sensory and Analytical Analyses of Nonfat Milk Formulations: Stability to Light Oxidation and Pasteurization
… 2-pentanone, acetaldehyde, diacetyl, hexanal, methyl sulfide) found in the two components. Pasteurized unoxidized skimmed milk had measurable levels of 2-butanone, acetaldehyde, and diacetyl. Pasteurization of skimmed milk increased concentration of 2-pentanone and methyl sulfide to …
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Modeling VOCs Emissions from Multi-layered Structural Insulated Panels(SIPs)
… engineered wood products. OSB emits pentanal and hexanal, two odorous aldehydes. These contaminants originate in the wood drying process through the breakdown of wood tissue and are, thus, inherent to most engineered wood products. The PSF in SIPs is a major source of styrene. The large surface …
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Evaluation of Initial Flavor Fade in Fresh Roasted Peanuts using Gas Chromatography-Flame Ionization Detection, Gas Chromatography-Olfactometry, Sensory Analysis, and Chemosensory Techniques
… of the oxidation reaction are nonanal, hexanal, octanal, and decanal. These chemicals are associated with cardboardy, painty, and oxidized flavors associated with flavor fade. The carbonyl-amine reaction yields a variety of pyrazines with positive flavor attributes. Initial flavor notes …
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The Antioxidant Function of Lutein in Controlling Photo-Oxidation of a Colloidal Beverage System
… beverage after light exposure (14 d, 4°C). Hexanal concentration, however, was not closely correlated with sensory differences. Results of the accelerated storage (12 hr, 25°C) study showed that the most damaging wavelengths to lutein stability were UV (200-400 nm) and 463 nm wavelengths. …
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Investigation of Binding of Volatile Flavor Compounds by Soy Proteins in Low -Moisture Food Systems by Inverse Gas Chromatography (Igc)
… and/or ionic forces, than for diacetyl and hexanal. Presence of soy proteins did not affect binding of diacetyl and hexanal, but increased binding of gamma-butyrolactone and butyric acid. Solvent extraction data agreed with IGC results in that retention/binding of butyric acid was higher in …
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Characterization of Fava Bean Hydrolysates for Future Use in Protein Enriched Beverages
… key volatile compounds, including aldehydes (hexanal, nonanal), alcohols (1-octen-3-ol), and furans (2-pentylfuran). Hexanal was present in all samples, while 2-pentylfuran produced the most prominent peak, with green bean, nutty, and vegetable-like flavor
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Temperature Effects on Drinking Water Odor Perception
… temperature for geosmin, MIB, nonadienal, n-hexanal, free chlorine, and 1-butanol. The higher water temperature resulted in an increase in odor intensity for some, but not all, concentrations of geosmin, 2-methylisoborneol, <i>trans-2,</i> <i>cis-6-</i>nonadienal, n-hexanal, free chlorine, …
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Frying Stability of Low-Linolenic Acid Soybean Oil and Examination of the P-Anisidine Value Method
… found to be highly significantly correlated with hexanal (r = 0.81), heptanal (r = 0.66), t-2-hexenal (r = 0.81), t-2-heptenal (r = 0.71), t-2-octenal (r = 0.92), and t,t-2,4-decadienal (r = 0.86) contents. p-Anisidine value was highly significantly correlated with overall odor intensity (r = …
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Electrochemical materials and microfabrication for sensor devices
… detection of glucose, nitrate, lactate, and hexanal. Glucose was detected across relevant concentration ranges for bovine saliva catalytic oxidation in NaOH and pH-altered saliva, demonstrating high sensitivities, low detection limits, strong selectivity, and long sensor lifespans. Nitrate …
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Optimizing the Extraction of Phenolic Antioxidant Compounds from Peanut Skins
… oxidative damage to cells. In the PB experiment, hexanal levels over the storage period were not high enough for the samples to be considered oxidized. However, hexanal values of PB samples treated with PSE were lower than the control throughout storage, which suggests that PSE may provide some …
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Measurement of lipid peroxidation in biology models using gas-chromatography-aass spectrometry
… found to include the lipid peroxidation product hexanal. The pro-oxidant cumene hydroperoxide elevated the levels of these lipid peroxidation products, whereas the anti-oxidant butylated hydroxy toluene (BHT) impaired their production. Derivatization of the aldehyde products of lipid peroxidation …
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Sensory and Chemical Characteristics of Soymilk Yogurt With Different Yogurt Cultures
… and methanol were also found. The amounts of hexanal found in yogurt samples were lower than the threshold values and did not contribute to distinctive beany flavor in soy yogurts. The STD culture produced higher concentrations of acetaldehyde and diacetyl than the STDAB and STDL cultures in …
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Lipid oxidation in food and model system
… were identified. The major products included hexanal, methyl 5-oxopentanoate, pentane, methyl butanoate, and 2,4-decadienal. Odor analysis of the oxidation products by GC effluent sniffing showed 22 regions wherein distinct odors could be detected which consisted of green/grassy, cheesy, …
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Studies on the Quality of Soybean Oil: Extraction Method, Soybean Type, and Oxidative Stability
… chain oxidation degradation compounds (pentanal, hexanal, and hexenal). In addition to use with fats and oils, the OSI method demonstrated its ability to determine an induction period index with intact snack food products, such as corn chips, potato chips, dry roasted peanuts, and pork rinds.
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Volatile Compounds in Vine Tea (Ampelopsis grossedentata)
… tea infusions. However, only seven aldehydes (hexanal, (E)-2-hexenal, (Z)-4-heptenal, nonanal, (E,Z)-2,4-heptadienal, (E,E)-2,4-heptadienal, and β-cyclocitral), two ketones (6-methyl-5-hepten-2-one and β-ionone), and one alcohol (1-penten-3-ol) were identified in more than 90% of all vine tea …
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Use of plant-derived essential oil compounds, naturally-occurring apple aroma compounds, and apple juice flavoring mixtures to control the growth of Escherichia coli O157:H7
… naturally-occurring apple aroma (AA) compounds (hexanal, trans-2-hexenal and 1-hexanol) to identify the minimum inhibitory concentrations necessary to inhibit E. coli O157:H7. Three commercial apple juice flavoring mixtures (natural apple cinnamon, natural apple spice and natural red apple) were …
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Supercritical Water desulfurization of crude oil
… performed to confirm that the key intermediate hexanal forms and rapidly decomposes to pentane and CO. In part 2, Arab Heavy crude was treated with SCW and analyzed with comprehensive gas chromatography (GCxGC) coupled with two detectors, sulfur chemiluminescence detector (SCD) and a flame …
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Oxidation of Disinfection Byproducts and Algae-related Odorants by UV/H₂O₂
… heptadienal, decadienal, and nonadienal, hexanal, and the two most prevalent classes of DBPs, trihalomethanes (THMs) and haloacetic acids (HAAs) were oxidized by UV photolysis alone and the UV/H₂O₂ process with 6 mg/L H₂O₂ and realistic ng/l to μg/L concentrations of the test compounds. …
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