Effects of Riboflavin and Fatty Acid Methyl Esters on Cholesterol Oxidation during IlluminationClick to copy article linkArticle link copied!
Abstract
The effect of riboflavin or fatty acid methyl esters on cholesterol photooxidation was studied. Samples containing cholesterol, either alone or in combination with riboflavin or fatty acid methyl esters, were illuminated at 25 °C in an incubator for 28 days. The various cholesterol oxidation products (COPs) and cholesterol were analyzed by gas chromatography−mass spectrometry (GC−MS), and riboflavin was determined by HPLC. Results showed that the presence of riboflavin or fatty acid methyl esters facilitated production of COPs and degradation of cholesterol, and the degradation fits a first-order model. The COPs formed during light storage included 7α-OH, 7β-OH, 7-keto, 3,5-cholestadien-7-one, 5,6α-EP, and 5,6β-EP. The addition of riboflavin caused formation of 3,5-cholestadien-7-one through dehydration of 7-keto, whereas in the presence of docosahexaenoic acid methyl ester, the formation of 5,6α-EP or 5,6β-EP was favored. Riboflavin was more effective for generation of COPs than fatty acid methyl esters.
Keywords: Riboflavin; fatty acid methyl ester; cholesterol photooxidation; GC−MS
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