A COLORIMETRIC DETERMINATION OF ACETOIN AND DIACETYL
نویسندگان
چکیده
منابع مشابه
A colorimetric determination of blood acetoin.
Most of the methods described for the determination of acetoin and biacetyl are based on the original Lemoigne-van Niel procedure (1, 2), which depends upon the formation of insoluble nickel dimethylglyoxime when biacetyl is treated with hydroxylamine in the presence of a nickel salt; acetoin is similarly determined after oxidation to biacetyl by heating with ferric chloride. In a recent modifi...
متن کاملA Colorimetric Determination of Blood Acetoin” by W. W. Westerfeldt
Most of the methods described for the determination of acetoin and biacetyl are based on the original Lemoigne-van Niel procedure (1, 2), which depends upon the formation of insoluble nickel dimethylglyoxime when biacetyl is treated with hydroxylamine in the presence of a nickel salt; acetoin is similarly determined after oxidation to biacetyl by heating with ferric chloride. In a recent modifi...
متن کاملDiacetyl and acetoin production by Lactobacillus casei.
Agitation of broth cultures of Lactobacillus casei retarded cellular dry weight accumulation but enhanced production of both diacetyl and acetoin. Addition of pyruvate overcame this retardation, but addition of sulfhydryl-protecting reagents did not. Both pyruvate and citrate enhanced accumulated dry weight of L. casei incubated without agitation, but only pyruvate increased diacetyl accumulati...
متن کاملMethod development for the determination of diacetyl and acetoin at a microwave popcorn plant.
Separate sampling and analytical methods for the determination of diacetyl and acetoin have been developed to assess workplace exposures at a popcorn processing facility have been described. Diacetyl (NMAM 2557) is efficiently recovered from an Anasorb CMS sampler tube when the composition of methanol in the desorption solvent is 1%, and acetoin (NMAM 2558) is efficiently recovered when the con...
متن کاملPlasmid-encoded diacetyl (acetoin) reductase in Leuconostoc pseudomesenteroides.
A plasmid-borne diacetyl (acetoin) reductase (butA) from Leuconostoc pseudomesenteroides CHCC2114 was sequenced and cloned. Nucleotide sequence analysis revealed an open reading frame encoding a protein of 257 amino acids which had high identity at the amino acid level to diacetyl (acetoin) reductases reported previously. Downstream of the butA gene of L. pseudomesenteroides, but coding in the ...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1943
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)51247-3