制备了辛烯基琥珀酸白糊精酯并对其溶解性和乳化特性进行了研究。木薯淀粉与0.25%HCl混匀,在105℃条件下烘干,并于130℃恒温限制性降解2 h制得白糊精。该白糊精与8%的辛烯基琥珀酸酐(OSA)混匀,在pH 8.5和温度45℃条件下反应5 h,制备得到取代度为0.0517的OSA白糊精酯。红外光谱显示,在1 640cm-1出现烯基吸收峰、1 724 cm-1出现羰基吸收峰,证明OSA白糊精酯的形成。控制白糊精与OSA反应时间为1 h和3 h,制备得到取代度分别为0.010 5和0.032 4的OSA白糊精酯。结果表明,该系列聚合度的OSA白糊精酯冷水可溶,乳化能力与取代度(DS)呈正比。由于酯化连接到白糊精分子上的疏水性基团增多,其稳定的水-液体石蜡乳状液的稳定性随DS增加而增强,储存1个月后乳液中位径D50无显著变化。

The synthetic conditions of octenyl succinic anhydrid( OSA) modified white dextrin ester and its emulsifying properties were investigated. The results showed that white dextrin was prepared by adding 0. 25% hydrochloric acid into cassava starch and drying at 105 ℃ before degradation at 130 ℃ for 2 hours. OSA white dextrin ester,with degree of substitution( DS) 0. 0517,could be formed under the following conditions: 14. 5% OSA,temperature 45 ℃,pH 8. 5,5 hours reaction. Infrared data showed that aliphatic absorption peak appeared at 1 640 cm- 1and 3 010 cm- 1,and carbonyl absorption peak appeared at 1 724 cm- 1. This demonstrated the formation of OSA was modified by white dextrin ester. Reaction time was controlled for 1 hour and 3 hours,two OSA white dextrin esters with DS 0. 0105 and 0. 0324 were obtained. The results also indicated that OSA modified white dextrin esters were soluble in cold water and the emulsion stability were increased with DS values,this was due to the increase number of hydrophobic groups on white dextrin molecules. After one month storage,D50of the emulsion solution did not changed much.