柠檬酸酯淀粉最佳制备条件的研究

Study on the optimal preparation condition of citrate starch

以玉米淀粉为原料,采用酯化变性的方法,在干法条件下制备高取代度柠檬酸酯淀粉,探讨反应时间、反应温度、pH值、柠檬酸浓度对淀粉酯化过程的影响。结果表明,高取代度柠檬酸酯淀粉的最佳制备条件为反应时间7h、反应温度130℃、pH为3.0、柠檬酸浓度为45%。

High DS（degree of substitution）citrate starch was prepared through the reaction by using corn starch with esterifiahle agent under dry condition. The effect of reaction time, reaction temperature, pH and citrate concentration on the esterify process were discussed. The optimal conditions to achieve the highest DS were found： reac tion time of 7 h,reaction temperature 130 ℃, pH 3.0, citrate con centration 45%.