Results 171 to 180 of about 10,745 (217)

Generation of Acetoin and Its Derivatives in Foods

Journal of Agricultural and Food Chemistry, 2014
Acetoin is a common food flavor additive. This volatile compound widely exists in nature. Some microorganisms, higher plants, insects, and higher animals have the ability to synthesize acetoin using different enzymes and pathways under certain circumstances. As a very active molecule, acetoin acts as a precursor of dozens of compounds.
Jian R Lu, Zijun Xiao
exaly   +3 more sources

Biosynthesis of Acetoin by Leuconostoc citrovorum

Nature, 1961
IT has been shown1 that in most bacterial cells acetoin is formed by the condensation of pyruvate and activated acetaldehyde. The findings of Beck-horn2, De Man3 and Mizuno and Jezeski4 leave no doubt that in the heterofermentative genus Leuconostoc the synthesis occurs via acetolactate.
M, BUSSE, O, KANDLER
openaire   +2 more sources

Acetoin as a Metabolite of Ethanol

Acta Physiologica Scandinavica, 1963
AbstractBlood acetoin concentrations in rabbits were followed after administration of ethanol to animals receiving disulfiram and to control animals. Disulfiram increased blood acetoin before and after the administration of alcohol. No increase was observed in animals receiving alcohol alone.
openaire   +2 more sources

Enhanced acetoin production by Bacillus amyloliquefaciens through improved acetoin tolerance

Process Biochemistry, 2014
Abstract Acetoin production by Bacillus amyloliquefaciens was used as a model of product feedback to develop a strategy to enhance the production of acetoin. To enhance the resistance of B. amyloliquefaciens to acetoin, an acetoin-tolerant mutant E-11 was screened by using adaptive evolution with acetoin stress as the selection pressure.
Qiuling Luo, Jing Wu, Minchen Wu
openaire   +1 more source

GC–FID determination of tetramethylpyrazine and acetoin in vinegars and quantifying the dependence of tetramethylpyrazine on acetoin and ammonium

Food Chemistry, 2018
2,3,5,6-Tetramethylpyrazine (TMP) is an important health functional composition in vinegars, but there are controversial viewpoints about its formation mechanism and scarce relevant records on TMP content enhancement in vinegar products. In this study, a simple and accurate solvent extraction coupled with GC-FID method was developed for the ...
Zijun Xiao, Ling Zhao, Li Tian, Linhui Wang, Jing-yi Zhao   +4 more
openaire   +2 more sources

Pyruvic decarboxylase and acetoin formation in Athiorhodaceae

Canadian Journal of Microbiology, 1973
Studies with cell-free extracts of Rhodopseudomonas palustris strain Q showed that under anaerobic conditions pyruvate was decarboxylated with the stoichiometric formation of carbon dioxide. Other products of the reaction include acetaldehyde and acetoin (acetyl methyl carbinol), indicating the presence of pyruvic decarboxylase. A survey of purple non-
S M, Qadri, D S, Hoare
openaire   +2 more sources

Mechanism of acetoin synthesis by α-carboxylase

Biochimica et Biophysica Acta, 1952
Abstract 1. 1. Highly purified preparations of α-carboxylase from wheat germ catalyze the synthesis of acetylmethylcarbinol (AMC) from pyruvate and acetaldehyde and from acetaldehyde alone. 2. 2. The AMC thus synthesized has been isolated and its identity established by conversion to diacetyl, periodate degradation, and by analysis of the ...
T P, SINGER, J, PENSKY
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ChemInform Abstract: PHOTODECOMPOSITION OF ACETOINS

Chemischer Informationsdienst, 1975
AbstractDie Photolyse der Acetoine (I) zu den Ketonen (II) und Acetaldehyd (III) wird untersucht.
HONG‐SON RYANG, HIROSHI SAKURAI
openaire   +1 more source

An acetoin-regulated expression system of Bacillussubtilis

Applied Microbiology and Biotechnology, 2006
An expression system, which is based on the promoter of the acoABCL operon of Bacillus subtilis was developed and characterized. The acoABCL operon codes for the acetoin dehydrogenase complex, which is the major enzyme system responsible for the catabolism of acetoin in B. subtilis. Besides weak organic acids, the neutral overflow metabolite acetoin is
Jörg, Silbersack, Britta, Jürgen, Michael, Hecker, Bernd, Schneidinger, Rainer, Schmuck, Thomas, Schweder   +5 more
openaire   +2 more sources

A Piezoelectric Crystal Detector for Acetoin

Analytical Letters, 1984
Abstract A piezoelectric quartz crystal coated with tetrabutyphosphoniun chloride was found to be a good detector for acetoin. The coating is sensitive in the ppb range and completely reversible. The response curve is linear over a concentration range of 8-120 ppb. The detector can be tuned to give a satisfactory response in 30 seconds.
A. A. Suleiman, E. C. Hahn, G. G. Guilbault, James R. Cavanaugh   +3 more
openaire   +1 more source