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