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In tests with purified menhaden oil at 37C and with squalene at 37C and 50C, unsubstituted tocol, 7,8-dimethyl tocol (gamma-tocol), and 8-methyl tocol (sigma-tocol) were superior antioxidants to 5,7-dimethyl tocol and 5,7,8-trimethyl tocol (alpha-tocol). In contrast to previous reports, there were no differences in the order of the activities of the tocopherols at different temperatures.
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Olcott et al. (1968) studied this question.
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