(ABTS) assay was also employed to measure the antioxidant activity of allthe three kinds of polysaccharides. Briefly, ABTS radical cation solution was prepared by 16 h of reaction of ABTS (7 mmol) with potassium persulfate (2.45 mmol) at room temperature in dark.The solution was diluted with ethanol to obtain an absorbance of 0.700 ± 0.005 at 734 nm. The decolorisation assay started by mix-ing the diluted ABTS solution (2 mL) with different polysaccharides(20 L, 10-100 g/mL). The mixture was allowed to react at 25◦C for 6 min and the absorbance at 734 nm was recorded as Ai. A controlsample containing the same amount of ethanol and ABTS radical was measured as A0. The absorbance of polysaccharides solution and ethanol with the same amount of ABTS was recorded as Aj. Fresh stocks of ABTS solution were prepared every five days due to self-degradation of the radical.