Extraction and Moisture Retention of Polysaccharides from Eragrostis Teff

The polysaccharides in the defatted eragrostis teff were extracted with cellulose enzyme and ultrasound auxiliary.The TPS1,TPS2 and TPS3 which were the main polysaccharides parts of eragrostis teff were obtained through purification on DEAE-cellulose,after the polysaccharides were taken off the protein with enzyme and decolored with activated carbon.Extraction ratios of the TPS1,TPS2 and TPS3 were 0.42%,0.66% and 0.54%.The molecular weight of TPS1,TPS2 and TPS3 were 7886 Da,8467 Da and 6366 Da respectively measured by high-performance gel permeation chromatography.The components of the polysaccharides were detected by ion chromatography.The results showed that TPS1 contains fructose.Both TPS2 and TPS3 was composed of Ara,Glu,Gla,Xyl,Man,Fru,Rib and an unknown sugar.Meanwhile the moisture retention and absorption performance of the TPS2 were studied.The results showed that the TPS2 moisture absorption and retention capacity are better than glycerol,polyethylene glycol 400 and chitosan.