高温酸法水解制备低分子量淀粉

The Preparation of Low Molecular Weight Starch Through Hydrolyzing by Using the High Temperature and Acid Process

目的:探索玉米淀粉酸水解特性及工艺条件。方法:以水解产物的分子量为指标,在淀粉糊化温度之上采用低浓度盐酸对淀粉进行水解,研究了糊化、水解温度、酸浓度以及水解时间对产物分子量的影响。结果:淀粉糊化后,采用0.01mol/L盐酸在100℃下水解为最佳的反应条件。在该水解条件下,产物分子量(Mw)与反应时间(t)具有呈乘幂关系,即Mw=5.8×104×t-1.44。结论:该公式可以有效地指导高温酸法水解制备指定分子量的淀粉。

In order to investigate the characteristics and the technological conditions of the acid hydrolysis of cornstarch,with the molecular weight of hydrolysis product as the index,low concentration of hydrochloric acid was used to hydrolyze starch above the temperature of starch gelatinization.And the effects of gelatinization,hydrolysis temperature,acid concentration and hydrolysis time on the molecular weight of the product were studied as well.The results indicated that the best reaction condition for the hydrolysis was at the temperate of 100℃using 0.01mol/L hydrochloric acid.On this hydrolysis condition,the relationship between the product molecular weight（Mw） and reaction time can be fitted by a power function,that is to say,Mw=5.8×104×t-1.44.This formula can effectively guide to prepare the starch of designated molecular weight by using the high temperature and acid process.