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(a) HPLC chromatogram profiles of eight catechins as standard reference materials. EGCg: (−)-epigallocatechin-3-gallate; EGC: (−)-epigallocatechin; ECg: (−)-epicatechin-3-gallate; EC: (−)-epicatechin; GCg: (−)-gallocatechin-3-gallate; GC: (−)-gallocatechin; Cg: (−)-catechin-3-gallate; and C: (+)-catechin. (b) Chemical structures of eight catechins tested in this study.
