Antioxidant Properties of Different Polysaccharides Extracted with Water and Sodium Hydroxide from Rice Bran

The antioxidant properties of water extracted polysaccharides (PW), 1%(w/v) NaOH extracted polysaccharides (PN1), and 5%(w/v) NaOH extracted polysaccharides (PN5) were assessed in this paper. PW showed good capability of scavenging H2O2, anti-lipid peroxidation, reduction power, and scavenging (DPPH). The maximum values were all observed at the dose of 1 mg/mL sample. As far as the antioxidant activities of PN1 were concerned, the capability of scavenging Superoxide radical, chelating metal, and total antioxidation showed higher than those of PN5. When polysaccharide concentration was I mg/mL, the 3 index described above were attached 71.8%, 51.6%, and 446.3 mu M Trolox equivalent, respectively. With respect to PN5, higher capabilities of scavenging hydroxyl free radicals were obtained while the peak of 84.8% vas observed at the concentration of 1.0 mg/mL. Moreover, the concentration-dependent influences were characterized in all cases.