Antioxidant activity of polysaccharide fractions extracted from Athyrium multidentatum (Doll.) Ching.

Crude polysaccharides were extracted from Athyrium multidentatum (Doll.) Ching (AMC) rhizome and fractionated by DEAE-Cellulose 52 ion-exchange column chromatography. Two polysaccharide fractions (F1 and F2) were obtained and had their antioxidant activities investigated employing various established in vitro systems. All fractions possessed considerable antioxidant activity. Chemical analysis suggested that F1 and F2 were neutral heteropolysaccharide in which glucose was the major component. Available data suggested that the molecular weight and sulfate content played very important roles on antioxidant activity. Our results indicated that the polysaccharides may contribute to the medicinal functions of AMC.