Objective The aim of the research was to discuss the scavenging mechanism of polysaccharide from sweet potato(PSP)on active oxygen free radicals.Method With the isolated and purified PSP as test materials,the chemical model systems were used to produce and ·OH.resp.And the scavenging capability of PSP on free radicals,its inhibition effect on pyrogallol autoxidation and the effects of PSP on SOD activity and MDA content in tumor-bearing mice were studied.Result In vitro,PSP both had scavenging effects on O2...