Synthesis and properties of the cassava starch succinate

摘要

Series of starch succinates with different DS (degree of substitution) were synthesized by the reaction of succinic anhydride (SA) and starch in aqueous alkali slurry. Effects of reaction time and temperature, the mole ratio of Na_2CO_3 to SA and the amount of SA on DS and RE (reaction efficiency) were discussed. The maximum DS could be up to 0.241 and prolonging reaction time had no evident influence on DS. Apparent viscosity of starch solution was improved while resistance to shear-thinning was reduced after modification. FT-IR confirmed the reaction between SA and starch. The apparent surface change was observed by SEM. XRD showed no crystalline pattern change but crystallinity was reduced when DS was higher than 0.110.