乙酸酐对魔芋葡甘聚糖的改性  

Modification of Konjac Glucomannan by Acetic Anhydride

作　　者：光善仪[1] 宫晓梅[1] 高晓燕[1] 徐洪耀[1] 

机构地区：[1]安徽大学化学化工学院,安徽合肥230039

出　　处：《精细化工》2004年第7期529-531,543,共4页Fine Chemicals

基　　金：国家科技部基础研究项目〔国科基字2000(26)〕;安徽省优秀青年基金(04044060);安徽省教委自然科学基金(2003kj016)。

摘　　要：研究了乙酸酐对魔芋葡甘聚糖的改性,制备了魔芋葡甘聚糖醋酸酯,优化了制备工艺条件,得出了酸性催化剂条件下,乙酰化魔芋葡甘聚糖的最佳改性工艺条件为:n(乙酸酐)∶n(魔芋葡甘聚糖)=4 8∶1,反应温度50℃,反应时间4h,催化剂c(H2SO4)=0 038mol/L,取代度DS=0 662。物化性能测试表明,取代度超过0 270时,魔芋葡甘聚糖醋酸酯在水中溶解;60℃时最大溶解度为w(魔芋葡甘聚糖醋酸酯)=12%,取代度超过0 469时,魔芋葡甘聚糖醋酸酯能制成均匀的薄膜,膜厚10～30μm。The optimum technique conditions for modification of konjac glucomannan(m-KGM) by acetic anhydride under acidic condition were determined.Reaction was carried out with n(acetic anhydride)∶n(m-KGM)=4.8∶1 at 50 ℃ for 4 h to attain konjac glucomannan acetate with the highest degree of substitution(DS) 0.662.The results of measurement show that konjac glucomannan acetate displays good solubility in water when DS is higher than 0.270,and it posseses excellent filming characteristics when DS is higher than 0.469.

关 键 词：魔芋葡甘聚糖醋酸酯 魔芋葡甘聚糖 乙酸酐 水溶性高分子 高分子改性 

分 类 号：O631.6[理学—高分子化学]