Crude selenium contained polysaccharide(Se-POP)was extracted from Pleurotus ostreatus fortified with sodium selenite,three purified fractions of Se-POP-1,Se-POP-2,Se-POP-3 were obtained by passing through DEAE-cellulose and Sephadex G-100 chromatographic column. The contents of total sugar, uronic acid and sulfuric acid in the three components were higher than that of Se-POP,while the content of selenium was almost not changed,and the sugar,uronic acid,sulfuric acid and selenium contents in Se-POP-1 were higher than that of Se-POP-2 and Se-POP-3.The scavenge rate for DPPH free radical and other free radicals was increased with the increasing concentration of Se-POP fractions, and clearance rate for Se-POP-1 was significantly higher than Se-POP-2 and Se-POP-3(P<0.05),the scavenge effect for Se-POP-1 with the concentration of 6 mg/mL on DPPH free radical, ABTS+radical, hydroxyl radical and superoxide anion free radical were 82.16 %,56.18 %,76.16 % and 79.25 %,respectively.
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