Response surface methodology for the Optimization of Preparation of Sweet potato distarch phosphates of low digestibility

The preparation of sweet potato distarch phosphates which possess low digestibility was optimized in this study. A central composite design of response surface methodology involving STMP concentration, pH, phosphorylation temperature and time was used, and second-order model for starch digestibility was employed to generate the response surface. The optimum condition for preparation of sweet potato distarch phosphates was as follows: STMP concentration 3%, pH 10, phosphorylation temperature 40 degrees C, and phosphorylation time 3h. The starch digestibility of sweet potato distarch phosphates was yield of 0.5508 +/- 0.0003 (n=3) under these conditions.