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(A) ESI chromatogram showing separation of isomers 291.27 m/z, (+)-catechin and (+)-epicatechin. The earlier peak represents (+)-catechin while the later is for (+)-epicatechin. (B) The product ion spectrum for (+)-catechin and (+)-epicatechin. (C) An ESI chromatogram representing the unique peak of (−)-epigallocatechin (307.27 m/z). (D) A product ion spectrum for (−)-epigallocatechin.
