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Both alpha‐ and gamma‐tocopherol are degraded by Fe 2+ and Cu 2+ . Ascorbic acid and EDTA completely inhibit the Cu 2+ oxidation but only ascorbic acid completely prevented the Fe 3+ oxidation although EDTA and citric acid gave some protection. On the other hand pure tocopherols, undiluted, were stable to air and light over a period of years.
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Cort et al. (1978) studied this question.
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