Chemical Studies on Antioxidant Mechanism of Curcumin: Analysis of Oxidative Coupling Products from Curcumin and Linoleate
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Abstract
As a part of a research project on the antioxidant mechanism of natural phenolics in food components, curcumin, a turmeric antioxidant, was investigated in the presence of ethyl linoleate as one of the polyunsaturated lipids. During the antioxidation process, curcumin reacted with four types of linoleate peroxyl radicals. Six reaction products were observed in the reaction and subsequently isolated. Their structures were determined by physical techniques, revealing that they have novel tricyclic structures, including a peroxyl linkage. On the basis of the formation pathway for their chemical structures, an antioxidant mechanism of curcumin in polyunsaturated lipids was proposed, which consisted of an oxidative coupling reaction at the 3'-position of the curcumin with the lipid and a subsequent intramolecular Diels--Alder reaction.
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