| 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 thepolyunsaturated lipids. During the antioxidation process, curcumin reacted with four types oflinoleate peroxyl radicals. Six reaction products were observed in the reaction and subsequentlyisolated. Their structures were determined by physical techniques, revealing that they have noveltricyclic structures, including a peroxyl linkage. On the basis of the formation pathway for theirchemical 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 lipidand a subsequent intramolecular Diels−Alder reaction. Keywords: Curcumin; linoleate; antioxidant mechanism; radical termination; oxidative coupling;structure determination; tricyclic compound
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