A component in the autoxidation products of linoleic acid (LA) which induced the endogenous lipid peroxidation was searched for. Secondary autoxidation products (SP) of LA induced the production of thiobarbituric acid reactive substances (TBARS) in liver as well as the LA hydroperoxides stimulated. SP were separated chromatographically into some fractions which were administered orally to rats. One fraction composed mainly of 9-oxononanoic acid (9-ONA) markedly stimulated the TBARS production in liver. Authentic 9-ONA also increased the lipid peroxide level as determined by a new test, as well as the activities of glutathione peroxidase and reductase in liver. Thus, hepatic lipid peroxidation was induced by orally given 9-ONA which was present in the autoxidation products of LA.
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Minamoto et al. (1985) studied this question.
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