Effect of Ethanol/Water Solvents on Phenolic Profiles and Antioxidant Properties of Beijing Propolis Extracts

Figure 1

HPLC chromatograms of different EEP (recorded at 280nm). (1) 3,4-Dihydroxybenzaldehyde, (2) vanillic acid, (3) caffeic acid, (4) p-coumaric acid, (5) ferulic acid, (6) isoferulic acid, (7) benzoic acid, (8) 3,4-dimethoxycinnamic acid, (9) cinnamic acid, (10) 4-methoxycinnamic acid, (11) cinnamylideneacetic acid, (12) 5-methoxy pinobanksin, (13) pinobanksin, (14) quercetin, (15) alpinetin, (16) kaempferol, (17) cinnamylideneacetic acid, (18) apigenin, (19) isorhamnetin, (20) pinocembrin, (21) benzyl caffeate, (22) pinobanksin-3-O-acetate, (23) chrysin, (24) phenethyl caffeate, (25) galangin, (26) benzyl p-coumarate, (27) pinostrobin, (28) tectochrysin, and (29) cinnamyl cinnamate.