羟丙基乙酰化双淀粉己二酸酯的制备

Preparation of Hydroxypropyl Acetylated Distarch Adipates

采用已二酸与乙酸酐对木薯淀粉进行改性制备乙酰化双淀粉己二酸酯,得出最佳工艺条件为:淀粉乳初始浓度30%,pH8,反应时间90min,混合酸酐加入量4.5%,羟丙基取代度为0.1264,酯化取代度为0.031。考察了羟丙基乙酰化双淀粉己二酸酯的凝沉性、冻融稳定性和透明度,其中抗凝沉性和冻融稳定性都有了很大的提高,溶解度和透明度略微降低。

Acetylated distarch adipates was prepared by cassava starch with adipic acetic mixed anhydride.It showed that the optimal parameters were initial starch slurry concentration 30%,pH 8,reaction time 1.5 h and mixed anhydride concentration 4.5%,respectively.The degree of hydroxypropyl substitution was 0.1264,mixed anhydride molar substitution degree was 0.031.The properties of retrogradation,freeze-thaw stability and the degree of clarity were studied,retrogradation and freeze-thaw stability of acetylated distarch adipates had been greatly improved,and solubility and transparency were slightly lower than cassava starch.