Abstract
The molecular weight distribution and antioxidant activity of polysaccharides from Schisandra chinensis (SCP) extracted by hot-water and ultrasonic pretreatment assisted were investigated, including scavenging activities against hydroxyl radical, 1,1-diphenyl-2-picrylhydrazyl (DPPH) and superoxide anion. Obvious differences in molecular weight distribution and antioxidant activity between the hot-water extracts and ultrasonic pretreatment assisted extracts were observed. The SCP with ultrasonic pretreatment was degraded causing an increase of fractions. Both of SCP showed a noticeable scavenging activity against hydroxyl radical and DPPH, and the antioxidant activity of SCP, with ultrasonic pretreatment, was higher. However, superoxide anion scavenging activity of SCP was hardly observed.
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