Effect of hydrogen peroxide treatment on color and activity of dried-litchi fruit polysaccharide

The crude polysaccharide of dried-litchi fruit often has a large amount of pigments，which can be cleaned up by hydrogen peroxide in the further step. In order to study the effect of hydrogen peroxide concentration on dried-litchi fruit polysaccharide，this paper evaluated the changes of solution color，content and activity of polysaccharide after hydrogen peroxide treatment，and selected the best concentration. The results showed that when the hydrogen peroxide concentration was 3%，the polysaccharide solution color would turn white，and polysaccharide loss was limited in 20%，and the free radical scavenging activity of DPPH and ATBS had not obvious reduction. 3% was better than other concentrations.