Anti-oxidative activities of phenolic compounds from barks of Pinus densiflora siebold et Zuccarini

Abstract

Phytochemical examination of the barks of Pinus densiflora Siebold et Zuccarini has led to the isolation of one phenylpropanoid, one lignan, one flavonoid, one flavan 3-ol and two procyanidins: 4-O-β-D-glucopyranosyl- p-coumaric acid (1), 2,3-dihydro-2-(4-methoxy)-7-hydroxy-3-hydroxymethyl-5-(3-hydroxy propyl)-benzofuran 3-O-α-D-glucopyranoside (2), taxifolin 3'-O-β-D-glucopyranoside (3), (+)-catechin (4), procyanidin B1 (5) and epicatechin-(4β-8)-catechin-(4α-8)-catechin (6). Among them, Compound 4, 5 and 6 showed potent anti-oxidative activities and these anti-oxidative activities were significantly different compared with ascorbic acid as positive control.