酯化交联淀粉反应及性质的研究

由三氯氧磷变性木薯淀粉所得的酯化交联淀粉，颗粒完整，形貌和偏光十字形态保持不变，反应主要发生在淀粉颗粒的无定形区内；经红外光谱等检测，发现产物分子中存在P—O—C和P＝O基团，表明淀粉分子中的羟基置换出三氯氧磷分子中的氯原子而发生酯化和交联；极小取代度的变性淀粉，其碘复合物的可见光吸收光谱与原淀粉相似，三氯氧磷最先和支淀粉作用.

Reaction and Properties of Esterified and Cross-Linked Starches

Tapioca starch was modified with phosphorus oxychloride, whosemorphology and hilum were same as those of native starch granules, and the reaction mainly took place in the amorphous size of starch granules. The groups of P—O—C and P=O in the products were discovered with IR and Laser Raman Spectrometers and proved the hydroxyl groups of starch molecular substituted for the chloride atoms of POCl3, Therefore, esterification and cross-link could exist. POCl3 first reacted with amylopectin. The absorption spectrum of starch-iodine complex was same as those of modified starches with little DS.