Oxidation of lipids. XVII. Crossover effect of tocopherols in the spontaneous oxidation of methyl linoleate.
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概要
- 論文の詳細を見る
Tocopherols suppressed the spontaneous, thermal oxidation of methyl linoleate and produced a clear induction period. During the induction period, small amounts of <I>cis</I>,<I>trans</I>-hydroperoxides were formed but the formation of <I>trans</I>,<I>trans</I>-hydroperoxides was almost completely inhibited. Tocopherols were consumed and when they were depleted, the induction period was over and a fast oxidation proceeded to give more <I>trans</I>,<I>trans</I>-hydroperoxides than <I>cis</I>,<I>trans</I>-hydroperoxides. However, tocopherols, especially α-tocopherol, acted as prooxidants when their concentrations were extraordinarily high and the rate of initial radical formation was low. The reducing agent such as ascorbic acid diminished the prooxidant action of α-tocopherol. This prooxidant effect of tocopherols was ascribed to the spontaneous formation of tocopheroxyl radical followed by the hydrogen atom abstraction by the tocopheroxyl radical from the hydroperoxide to give a peroxyl radical.
- 公益社団法人 日本化学会の論文
著者
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Takahashi Mareyuki
Department of Reaction Chemistry, Faculty of Engineering, University of Tokyo, Hongo
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Takahashi Mareyuki
Department of Reaction Chemistry, Faculty of Engineering, The University of Tokyo
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Yoshikawa Yasuyuki
Department of Reaction Chemistry, Faculty of Engineering, University of Tokyo, Hongo
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Niki Etsuo
Department of Reaction Chemistry, Faculty of Engineering, University of Tokyo, Hongo
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Niki Etsuo
Department of Reaction Chemistry, Faculty of Engineering, The University of Tokyo
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Yoshikawa Yasuyuki
Department of Reaction Chemistry, Faculty of Engineering, The University of Tokyo
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