The antioxidant activities of branched-chain amino acid derivatives, such as dipeptides and amino alcohols, were evaluated by means of the active oxygen method. Dipeptides containing a branched-chain amino acid showed higher antioxidant activities than did those having no branched-chain amino acid. An N-terminal branched-chain amino acid in dipeptides was preferable to a C-terminal one for antioxidant activity. A free N-terminal amino group was also found to be important for the appearance of antioxidant activity.
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Kawashima et al. (1979) studied this question.