A SECONDARY REACTION IN THE OXIDATION OF L-METHIONINE BY CHROMIUM(VI) IN ACIDIC MEDIUM

被引：27
|
作者：
SALA, LF
PALOPOLI, C
ALBA, V
SIGNORELLA, S
机构：
[1] Departamento de Ciencias Exactas, Facultad de Ciencias Bioquímicas (UNR), 2000 Rosario
来源：
POLYHEDRON | 1993年 / 12卷 / 18期
关键词：
D O I：
10.1016/S0277-5387(00)88261-3
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The reaction mechanism of the oxidation Of L-methionine by chromium(VI) in perchloric acid has been reviewed. Secondary reaction products formed by methionine C(1)-C(2) bond scission were observed, besides the major oxidation product: methionine sulphoxide. Methionine sulphoxide and methional (3-[methylthio]-propionaldehyde) were found to be produced by two parallel redox steps. Ammonia and carbon dioxide have been identified and their yields determined. Free radicals were detected during the reaction course and the yield of carbon dioxide was found to be independent of the amount of free radical scavenger. When the amino group was blocked by an acetyl group the N-acetylmethionine sulphoxide was the only oxidation product. The mechanism with the associated reaction kinetics are presented and discussed.
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页码：2227 / 2234
页数：8
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