水溶性辛烯基琥珀酸淀粉酯的三偏磷酸钠改性

The modification of soluble octenyl succinic anhydride modified starch by trisodium trimetaphosphate

摘要:

辛烯基琥珀酸淀粉酯是一种重要的乳化剂，但其成膜性能有待提升。本文以酶解后的水溶性辛烯基琥珀酸糯玉米淀粉酯（简称OSS）为原料，三偏磷酸钠为改性剂，制备改性OSS膜。以膜的抗拉强度为响应值，通过单因素和响应面试验优化了OSS膜的改性工艺，并对其结构进行表征。结果表明，最佳工艺条件为：反应时间5.8 h、pH值6.8、三偏磷酸钠用量18.0%，在此条件下，改性OSS膜的抗拉强度为2.19 MPa，比对照样提高了69.77%。改性OSS膜断面均匀，起始相变温度提高14.6 ℃，31PNMR和FTIR表明三偏磷酸钠和OSS以氢键的方式缔合，从而提高OSS膜的性能。经对比发现，OSS乳化负载维生素E后再经三偏磷酸钠改性，可有效提高乳化膜的成膜性和维生素E的高温贮藏稳定性。

Abstract:

Octenyl succinic anhydride modified starch is an important esterifying agent, but its film-forming property needs to be improved. In this paper, taking the enzymatic hydrolysis of octenyl succinic anhydride modified waxy corn starch (OSS) as raw material, trisodium trimetaphosphate as modifier, the modified OSS films were prepared. The modified conditions were optimized by single-factor and response surface experiments using the tensile strength of films as the response value, and the structure of modified OSS films obtained under the optimal conditions was characterized. The results showed that the optimal process conditions were: 5.8 h for reaction time, 6.8 for reaction pH value, 18.0% for trisodium trimetaphosphate addition, and the tensile strength of modified OSS films obtained under these conditions was 2.19 MPa, 69.77% higher than the contrast. After modification, the cross section of OSS films were relatively homogeneous, and the onset phase transition temperature increased 14.6 ℃. The results of 31PNMR and FTIR showed that trisodium trimetaphosphate and OSS were associated to improve the performance of OSS films in the form of hydrogen bond. It is found that the film-forming property and the storage stability in high temperature of emulsive films could be effectively improved by modification of trisodium trimetaphosphate after emulsification of OSS with Vitamin E.