Ultrasonic-assisted extraction and antioxidant activities of polysaccharides from Radix Astragali

摘要

Ultrasonic-assisted extraction (UAE) method was used to polysaccharides from Radix Astragali (RAP), and the orthogonal test was applied to optimize extraction conditions. Furthermore, the antioxidant activities of RAP were evaluated by DPPH and superoxide anion radical scavenging activities assay. The results indicated that the optimal conditions for RAP extraction as followings: solid/liquid ratios of 1:20, extraction time of 10 min, ultrasonic power of 65 W and extraction temperature of 60°C. Meanwhile, RAP had relatively higher scavenging activities on DPPH and superoxide anion radicals.