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The cell membrane is protected against lipid peroxidation by endogenous antioxidants such as vitamin E (α-tocopherol). The oxidised form of α-tocopherol (α-tocopherol quinone) does not have this antioxidant function. However, the literature indicates that α-tocopherol quinone can be reduced to α-tocopherol in vivo and thereby will add to the total antioxidant potential (Moore AN, Ingold KU. Free Radic...
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