acetoin


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ac·et·o·in

(as-et'-ō-in),
A condensation product of two molecules of acetaldehyde.

acetoin

(a-set'o-in) [L. acetum, vinegar + -in]
The substance formed when glucose is fermented by Enterobacter aerogenes.
CAS # 513-86-0
Synonym: 3-hydroxybutanone
References in periodicals archive ?
Further, the [V.sub.max] values were 7.78, 5.73, and 1.87 [micro]M acetoin [mg.sup.-1] protein [h.sup.-1] for [B.sub.4], [B.sub.13] and [B.sub.1] biotypes, respectively (Table 1).
One gram of 1,4-DMB (Acros Organics, Bridgewater, New Jersey) and acetoin (TCI America, Portland Oregon) was dissolved in 1 to 2 mL acetone before application to the sponge.
Furthermore, the addition of pectase to nonextracted juice could accelerate the release of odor-active volatiles such as 3-ethoxy-1-propanol, acetic acid, octanoic acid, n-decanoic acid, isoamyl acetate, ethyl octanoate, ethyl oleate, furfural, acetoin, and eugenol.
It was positive for glucose, sorbitol, rhamnose, L-arabinose, melibiose, lysine, ornithine, citrate, galactoside, and cellobiose tests and negative for sucrose, raffinose, inositol, adonitol, urea, hydrogen sulfide, indole, arginine, tryptophan deaminase, aesculin, acetoin, malonate, tartrate, acetamide, cetrimide, and Voges-Proskauer tests.
HPLC Analysis of Glucose Organic Acids and Acetoin. Glucose, lactate, acetate, and acetoin concentrations were analyzed in the filtered samples by HPLC using a Fast Fruit Juice column.
iniae: acetoin production (Voges Proskauer) (Remel, USA), aminopeptidase leucine (LAP) (Remel, USA), arylamidase pyrrolidonyl (PYR) (Remel, USA), starch hydrolysis (Merck, Germany) and esculin hydrolysis (Neogen, Acumedia, USA).
Rao et al., "Two-stage pH control strategy based on the pH preference of acetoin reductase regulates acetoin and 2,3-butanediol distribution in Bacillus subtilis," PLoS ONE, vol.
Lactic acid, acetaldehyde, diacetyl, acetoin, acetone, and 2-butanone have been noted to contribute to the typical flavour of yoghurt [13].
The above behavior suggests the synthesis of other compounds such as non-precipitating levan, cited by Viikari (1984), sorbitol, acetic acid, lactate, acetaldehyde, glycerol, acetoin, di-hydroxy-ketone, mannitol and gluconic acid (Ernandes & Garcia-Cruz, 2011; Madigan, Martinko, Dunlap, & Clark, 2010).
All organisms including gram positive and gram negative bacteria were subjected to a battery of tests as follows: Gram staining for morphology, hanging drop for motility, capsular staining using Congo red, for production of enzymes-Oxidase, Catalase, Nitrate reduction, Urease, for substrate utilization-Citrate utilization test, Malonate utilization, for metabolism of proteins and amino acids- Indole production, tests for specific breakdown products-Methyl red test, Voges-Proskauer (Acetoin production), tests for utilisation of carbohydrates of sugar media containing Glucose, Lactose, Xylose, Sucrose, Maltose, Mannitol.
Chan School of Public Health tested 51 types of flavored e-cigarettes and liquids sold by leading brands for the flavoring chemicals diacetyl, acetoin and 2,3-pentanedione.
vulnificus Item isolates Gram--staining Gram--negative slightly curved rods Motility Motile O/129 sensitivity (150 mg) + B--Galactosidase production -- (OP.N.G) Arginine dihydrolase production (ADH) Lysine decarboxylase Variable production(LDC) Ornithine decarboxylase Variable production(ODC) Citrate utilization (CIT) -- H2S production(H2S) -- Urease production(URE) -- Tryptophane deaminase -- production (TDA) Indole production(IND) Variable Acetoin production(VP) -- Gelatinase production(CEL) Variable Acid from glucose(GLU) Variable Acid from manitol(MAN) Variable Acid from inositol(INO) -- Acid from Sorbitol(SOR) -- Acid from rhamnose(RHA) -- Acid from sucrose(SAC) -- Acid from melibiose(MEL) -- Acid from amygdalin (AMY) + Acid from arabinose (ARA) -- Cytochrome oxidase (OX) +