Sweet potato starch phosphoric ester was prepared with sweet potato starch as raw material and sodium trimetaphosphate.The gelatinization properties of starch phosphoric ester was studied in detail by polarizing microscopy,spectrophotometer and circumvolution viscosity analyzer and so on.The results indicated that sweet potato starch phosphoric ester showed higher pasting temperature,stability of hot and cold viscosity,stability of freeze-thaw and higher salt tolerance,while the transparency,settlement,and ...