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A low molecular weight sulfated polysaccharide (LMWF) was prepared from Laminaria japonica by mild acid hydrolysis. The antioxidant activity of LMWF in vitro was studied using three kinds of oxygen free radical systems. LMWF had effective scavenging abilities on superoxide radical, hydroxyl radical and hypochlorous acid directly in vitro. The hepatoprotective effect of LMWF was studied using two acute...