Figure 4.
HPLC chromatogram of a standard mixture of polyphenolic compounds (1: gallic acid, 2: (+)-catechin, 3: vanillic acid, 4: caffeic acid, 5: (−)-epicatechin, 6: p-coumaric acid, 7: rutin, 8: ellagic acid, and 9: quercetin).
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