Results 151 to 160 of about 6,598 (201)

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

Elektrofermentation von Acetoin

BIOspektrum, 2018
Electrode-assisted fermentation is a new strategy in anaerobic biotechnology. It can be used for reactions in which the average oxidation state of the end product is higher than the substrate. Here we show two applications of an electrode-assisted fermentation for the anoxic production of acetoin.
Beblawy, Sebastian, Bursać, Thea Viola, Gescher, Johannes   +2 more
openaire   +1 more source

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
openaire   +2 more sources

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

Salting-out extraction of acetoin from fermentation broths using hydroxylammonium ionic liquids as extractants

, 2020
The salting-out extraction (SOE) systems based on ionic liquids (ILs) have attracted extensive attention in the separation of bio-based products, in which imidazolium ILs were widely studied.
Yan Li, Jian-Ying Dai, Z. Xiu
semanticscholar   +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

Efficient acetoin production from pyruvate by engineered Halomonas bluephagenesis whole-cell biocatalysis

Frontiers of Chemical Science and Engineering, 2023
Mei-Yu Zheng, Zhenzhen Cui, Jing Zhang, Jing-Guo Fu, Zhi-Wen Wang, Tao Chen   +5 more
semanticscholar   +1 more source

Efficient production of acetoin from lactate by engineered Escherichia coli whole-cell biocatalyst

Applied Microbiology and Biotechnology, 2023
Zhenzhen Cui, Mei-Yu Zheng, Meng-Nan Ding, W. Dai, Zhi-Wen Wang, Tao Chen   +5 more
semanticscholar   +1 more source