Treatment of a mixture of epicatechin and epigallocatechin with extracts of fresh tea leaf or banana fruit generated a new pigment named theanaphthoquinone, which has a 1,2-naphthoquinone moiety oxidatively derived from the benzotropolone unit of theaflavin.
Theanaphthoquinone, a novel pigment oxidatively derived from theaflavin during tea-fermentation
T. Tanaka, Y. Betsumiya, C. Mine and I. Kouno, Chem. Commun., 2000, 1365 DOI: 10.1039/B003510F
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