Objective: An preliminary study on antioxidant activity of Turnip seed polysaccharide was carried out through radical scavenging experiment in vitro. Method: Several methods include degreasation

water extraction

deproteinization

decolorization and alcohol precipitation were adopted to extract polysaccharide. Four common of antioxidant activity in vitro testing methods were selected

namely scavenging DPPH radical

hydroxyl radical

superoxide anion radical and total reducing ability

to measure the antioxidant capacity of Turnip seed polysaccharide

and ascorbic acid Vit C(Vc) was selected as the positive control. Result: Turnip seed polysaccharide have a certain amount of antioxidant activity

and the extraction rate of is 2.34%. The antioxidant capacity of polysaccharide and its concentration have good dose-effect relationship. Besides

higher concentration can enhance the antioxidant activity. Meanwhile

Turnip seed polysaccharide has strong total reduction ability

but relatively weak superoxide anion radical scavenging capacity. Conclusion: The experiments show that Turnip seed polysaccharide has natural antioxidant capacity

and using turnip seed as raw materials to develop multi-functional carbohydrate foods will have a more realistic practical significance.