A study was made of the enzymic oxidation of various flavanols, alone or in combi-nation of them. The results confirmed that the oxidation of mixtures containing the catechol flavanols and(_??_)-epigallocatechin developed remarkable red colors. In addition to the current information some other courses producing the theaflavin-like substance were found. Furthermore it was suggested that there exist several kinds of substance occupying the similar position on the chromatogram as spot Y of Roberts.
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NAKAGAWA et al. (1965) studied this question.