Study on the Extraction Technology and Antioxidant Activity of Yam Polysaccharide

[Objective] To study the extraction technology and antioxidant activity of yam polysaccharide.[Method] The orthogonal experiment was adopted to optimize the extraction conditions of pH,solid-liquid ratio,extraction temperature and extraction time,and the effect of yam polysaccharide to scavenge H2O2,O2-· and ·OH was studied.[Result] The best extraction conditions were pH 9,1∶20 g/ml of solid-liquid ratio,100 ℃ of temperature,and 1.5 h of extraction time.And the extracted yam polysaccharide showed strong antioxidant activity.[Conclusion] The study provides certain theoretical basis for the further development and utilization of yam polysaccharide.