羟丙基淀粉颗粒形貌和结晶结构的研究

Study on the Granule Appearance and Crystal Structure of Hydroxylpropyl Starch

本文应用扫描电镜、X-光衍射和偏光显微等现代分析技术，观察和研究了不同取代度羟丙基淀粉和原淀粉的颗粒形貌及其结晶结构。结果表明：淀粉羟丙基化反应首先发生在淀粉颗粒中结构较薄弱的非结晶区。随着取代度增大，淀粉颗粒表面发生凹凸不平变化，出现洞穴和裂痕，使淀粉易于糊化，糊化温度降低。

The granule appearance and crystal structure of hydroxylpropyl starch were studied at different molar substitution with scanning electron microscopy,X-ray diffraction andpolarizing microscopy. The results indicated that the hydroxylpropylation occurred in theamorphous regions from the surface of a granule at the beginning, hydroxylpropylation produced some surface corrosion on the granules, and the gelatinisation temperature decreasedwith the increase of molar substitution.