Cross - linking and esterifying starch of mechanical activated cassava starch was prepared by using mechanical activated cassava starch as raw material, and using sodium trimetaphosophate for cross - linking agent and acetic anhydride for acetification, which its synthesis route prepared by continual reactions in one - step synthesis way. The effects of reaction temerature, cross - linking agent and esterifying agent dosage, pH value of cross — linking and esterifying and cross - linking time on the cold viscosity of cross - linking and esterifying starch paste were investigated respectively, and the physical and chemical Parameters and structure of the cross - linking and esterifying starch with mechanical activated cassava starch and cross - linking and esterifying starch with raw cassava starch were studied. The results indicated that the above reaction conditions were all found to affect the preparation of cross - linking and esterifying mechanical activated cassava starch. Under the reaction temperature 40℃ ,1.0% amounts of sodium trimetaphosphate,crosslinking pH value 10.0,crosslinking time 2. 0 h,acetic anhydride amount 0. 5 mL,esterifying pH value 9.0, esterifying time 60 min, the cold viscosity of cross - linking and esterifying starch paste of mechanical activated cassava was enhanced from 847 mPa. S of cassava starch to 3 225 mPa. S, and the stability, acidity - resistance, staling resistance of the viscosity of starch paste were significantly improved. Cross - linking and esterifying composite modified was propitious to formation of V type crystal starch.
NETL
NSTL
万方数据
维普
