The comparison of antioxidant activity of polysaccharides extracted from Litchi by different ways

The antioxidant activities of polysaccharides extracted from Litchi by two ways,traditional hot water and ultrasonic-microwave-enzyme synergistic method,that were evaluated by the DPPH assay,ABTS assay,FRAP assay.The results were compared with that of positive control BHT.The results showed that:in tested concentration range,two extracts had some antioxidative activities.And the antioxidant activity of the polysaccharides extracted from Litchi by ultrasonic-microwave-enzyme synergistic technology was 2.00,6.40,7.83 times as strong as traditional hot water,24.65%,10.00%,12.49% as weak as BHT(P0.05).