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Co‐oxidation of the Sulfur‐Containing Amino Acids in an Autoxidizing Lipid System
Author(s) -
WEDEMEYER GARY A.,
DOLLAR ALEXANDER M.
Publication year - 1963
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1963.tb00239.x
Subject(s) - cystine , chemistry , methionine , sulfur , amino acid , cysteine , sulfoxide , methionine sulfoxide , lipid oxidation , organic chemistry , chromatography , biochemistry , antioxidant , enzyme
SUMMARYM Oxidation of the sulfur amino acids by autoxidizing lipids was studied in a model system consisting of an amino acid dispersed in cold‐pressed, molecularly distilled menhaden oil (20–80% w/w). Under all conditions investigated, cysteine was oxidized completely to cystine. Preliminary results suggest that at 110°C the oxidation follows first‐order kinetics for at least the first 8 hr. A specific reaction rate constant of 0.25 per hour was calculated. When fatty acids were added to the system, cystine was oxidized to its thiosulfinate ester. When the fatty acid‐cystine ratio was 1:2, oxidation of cystine was a maximum. No oxidation of cystine occurred unless either a fatty acid, volatile organic acid, or ethanol was added. Under the conditions investigated, methionine was not oxidized to either its sulfoxide or its sulfone.