OBJECTIVE To characterize the structure of homogenous polysaccharide HPS-3 obtained from Radix Hedysari,and study its antioxidant activity METHODS Based on HPLC、GC、IR and ~1HNMR,to study the structural features of HPS-3,scavenging effect to superoxide anion(O~-_2·),hydroxyl radical(·OH), DPPH and H_2O_2 were measured in vitro chemical simulated systems for evaluating their antioxidant activity RESULTS The results of GC indicated that HPS-3 consisted of rhamnose,xylose,arabinose,glucose and galactose with a ...