Oxidation of lipids. V. Oxidation of methyl linoleate in aqueous dispersion.
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概要
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The rate and products of oxidation of methyl linoleate dispersed in water by Triton X-100 were measured at 50 °C. The oxidation was initiated by water- or oil-soluble azo-initiators. The oxidation proceeded smoothly by both types of initiators without any noticeable induction period and a constant rate of oxygen uptake was observed. Conjugated diene hydroperoxides were formed almost quantitatively. The oxidizability for methyl linoleate in aqueous dispersion was obtained as <I>k</I><SUB>p</SUB>/(2<I>k</I><SUB>t</SUB>)<SUP>1⁄2</SUP>=0.032(s·mol/L-oil)<SUP>−1⁄2</SUP> where <I>k</I><SUB>p</SUB> and <I>k</I><SUB>t</SUB> are the rate constants for propagation and termination reactions, respectively. This value was similar to that observed in the homogeneous oxidation in chlorobenzene. L-Ascorbic acid inhibited the oxidation initiated by water-soluble initiator but it could not inhibit the oxidation initiated by oil-soluble initiator. 2,6-Di-<I>t</I>-butyl-4-methylphenol inhibited the oxidation initiated by both initiators. On the other hand, α-tocopherol was effective for the oxidation initiated by oil-soluble initiator and it incompletely inhibited the oxidation initiated by water-soluble initiator.
- 公益社団法人 日本化学会の論文
著者
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Yamamoto Yorihiro
Department Of Bionics Tokyo University Of Technology
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Kamiya Yoshio
Department of Applied Chemistry Faculty of Engineering The University of Tokyo
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Niki Etsuo
Department of Reaction Chemistry, Faculty of Engineering, The University of Tokyo
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Haga Shunichi
Department of Reaction Chemistry, Faculty of Engineering, The University of Tokyo
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