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... Mitochondrial aldehyde dehydrogenase (ALDH2) is the major ALDH isozyme involved in acetaldehyde metabolism. It is well established that a single nucleotide substitution (G to A) leads to the amino acid change (Glu487Lys) and dominant inactivation of ALDH2 activity. Inactivation of ALDH2 activity causes the aversive reactions associated with “flushing” response observed in many East Asian people fo ...
dioxane; acetaldehyde; chemical reactions; nuclear magnetic resonance spectroscopy
Abstract:
... Condensation of 3-O-benzyl-D-allose with acetaldehyde forms a complex mixture from which potentially useful mono- and di-O-ethylidene derivatives were isolated and identified. Compounds isolated and identified after conversion of unsubstituted hydroxyl groups into the corresponding acetates included 1,2-di-O-acetyl-3-O-benzyl-4,6-O-ethylidene-β-D-allopyranose; 5,6-di-O-acetyl-3-O-benzyl-1,2-O-(R)- ...
... Study of the effect of treatment of cellulose with a flame retardant required knowledge of the behavior of cellulose alone under the conditions of the experiment. Compounds obtained included carbon monoxide, carbon dioxide, water, methane, ethane, ethene, propane, propene, butene, acetaldehyde, furan, 2-methylfuran, methyl ethyl ketone, 2,5-dimethylfuran, 2,3-butanedione, methyl isopropenyl ketone ...
... Pyrolysis-gas chromatography-mass spectrometry studies of fulvic and humic acids from different soils: Calcic Rhodoxeralf, Typic Xerochrept, Typic Chromoxeret, Andic Hapludult, Humic Haplorthod, Typic Haplorthod and a Canadian Orthic Humo-Ferric Podzol were made. Samples were pyrolyzed at 700°C for 10 sec, and low boiling point compounds were separated in a Chromosorb 102 column. Peaks were identi ...
... Alcohol dehydrogenase (alcohol:NAD oxidoreductase, E.C. 1.1.1.1) activity was observed on acetaldehyde and n-hexanal in homogenized cell extract of Steptococcus lactis C2. Substrate inhibition was apparent at levels of n-hexanal above 4.0 mM. Increased centrifugal force from 12.000 × g for 20 min to 350,000 × g for 1 h resulted in increased specific activity in the cell-extract supernatant fluids. ...
acetaldehyde; acidity; manufacturing; multiple strain starters; single strain starters; yogurt
Abstract:
... Yoghurt has been made successfully on a laboratory scale using single‐starter organisms. The resulting yoghurts have acidity and acetaldehyde content comparable to those made with mixed starter organisms. These products may therefore be of interest commercially. The advantages and disadvantages are discussed. ...
... Modifications of red wines colouring material during aging, in barrels or in vats, needs the presence of oxygen to induce a production of traces of acetaldehyde from joined oxidation between alcohol and phenolic compounds. Acetaldehyde makes possible a polymerization of anthocyanins ; other phenolics take place in this reaction. As consequence, colour is increased and stabilized in spite of a decr ...
... Olfactory response and resource utilization in Drosophila were compared among three domestic (D. melanogaster, D. simulans, D. immigrans) and one Australian endemic (D. lativittata) species. Olfactory response was measured in a choice type olfactometer (Fuyama, 1976). The following chemicals common in Drosophila resources were used as odourants: acetaldehyde, acetic acid, propionic acid, methanol, ...
... The tolerance and utilization of ethanol, acetic acid and acetaldehyde vapour was investigated in Asobara persimilis (Hymenoptera: Braconidae), a parasitoid of Drosophila. No significant utilization of ethanol or acetaldehyde occurred at low concentrations (<1.5% and 0.1% respectively), however both female and male longevity was increased at concentrations of 1.0 and 1.5% acetic acid. All substanc ...
... La catéchine ou l'épicatéchine réagissent sur le monoglucoside de malvidine en présence d'acétaldéhyde pour donner dans un premier temps deux composés de condensation fortement colorés. Le rapport des concentrations entre ces deux produits est constant dans le temps, mais variable selon le phénol. Le diglucoside réagit également mais beaucoup moins rapidement. Au bout d'un certain temps, deux nouv ...
... For survival measured by longevity, acetaldehyde is beneficial at low and stressful at high concentrations in Drosophila utilizing ethanol as a major resource. This is an example of the increasingly common observation of hormesis which is the stimulatory effect by toxic agents at subinhibitory levels. Organic metabolites such as acetaldehyde and organisms such as Drosophila offer the possibility o ...
... Stalks of sweet sorghum (S. bicolor cv. Wray) were (a) cut into 0.6cm chips by a laboratory chopper; (b) cut into 30cm billets, shredded and passed through a 3-roller mill which removed about a third of the juice; or (c) cut into chips and crushed to finer bagasse in a screw press. The unsterilized products all readily underwent anaerobic solid-state fermentation, presumably by wild yeasts and het ...
... Hamlin, Pineapple and Valencia oranges were stored in controlled atmospheres (CA) of nitrogen, carbon dioxide or 0.1–0.7% acetaldehyde in air 8–24 hours and changes in seven volatiles during 0–8 days determined by gas chromatography. Increases in acetaldehyde, ehtyl acetate, ethyl butyrate and ethanol were noted in samples after nitrogen or carbon dioxide CA storage with maximum increase 1–2 days ...
... Cotton (Gossypium hirsutum L.) roots die within a few hours in the total absence of O2, but can continue growing for several hours at a reduced rate very low at O₂ concentrations, even <10 mmol O₂ mol⁻¹. The physiology of this adaptive response has not been well characterized. The objective of this study was to determine if ethanolic fermentation occurs in cotton seeds under hypoxic conditions tha ...