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Co-oxidation of the sulfur-containing amino acids in an autoxidizing lipid system

September 8, 2015

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.

Citation Information

Publication Year 1963
Title Co-oxidation of the sulfur-containing amino acids in an autoxidizing lipid system
DOI 10.1111/j.1365-2621.1963.tb00239.x
Authors Gary Wedemeyer, A.M. Dollar
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Food Science
Series Number
Index ID 70161192
Record Source USGS Publications Warehouse
USGS Organization Western Fisheries Research Center