摘要：The origin of the antioxidant activity of Luobuma aqueous extract was examined by measuring the peroxynitrite (ONOO−)-eliminating activities of fractions of this extract obtained by Sephadex LH-20 column chromatography. Three of the four fractions obtained, i.e. , those excluding the H2O-eluted fraction, were found to possess ONOO−-eliminating activity. These three fractions were combined and fractionated again by Sephadex LH-20 column chromatography, which yielded five fractions. Seven different compounds were isolated from two of these five fractions with high activity. Epigallocatechin-(4β-8)-epicatechin showed the highest ONOO−-eliminating activity.
