机械活化协同微波法制备高取代度柠檬酸酯淀粉  

Preparation of Citrate Starch with High Degree of Substitution by Mechanical Activation-Assisted Microwave Irradiation Method

作　　者：陈渊[1] 杨家添[1] 张秀姣 欧诗德[2] 江靖[1] 王婕[1] 

机构地区：[1]玉林师范学院化学与材料学院,玉林537000 [2]玉林师范学院数学与信息学院,玉林537000

出　　处：《中国粮油学报》2014年第12期23-30,共8页Journal of the Chinese Cereals and Oils Association

基　　金：广西科学研究与技术开发计划(桂科转1298009-20);博士科研启动基金(G2012010);广西大学生创新创业训练计划(201310606028)

摘　　要：在微波辐射条件下,以不同机械活化时间的木薯淀粉为原料,柠檬酸为酯化剂,氢氧化钠为催化剂制备柠檬酸酯淀粉。以取代度和反应效率为指标,分别探讨机械活化时间、微波功率、微波辐射时间、淀粉含水量、柠檬酸用量及氢氧化钠用量对木薯淀粉柠檬酸酯化反应的影响,并对影响因素进行了正交优化。结果表明,木薯淀粉经机械活化后,对微波功率、微波辐射时间、酯化剂用量、催化剂用量、淀粉含水量的依赖性明显降低,取代度和反应效率均为原木薯淀粉的2倍多。通过正交试验确定了制备柠檬酸酯淀粉的最佳工艺条件:微波功率800 W、微波辐射5.0 min、淀粉含水量35%、柠檬酸质量分数50%、氢氧化钠质量分数6%,所得产品的取代度为0.399 8,反应效率为88.84%。并采用红外光谱和X-射线衍射对木薯淀粉、活化淀粉及高取代度柠檬酸酯淀粉进行了表征。On the condition of microwave irradiation, citric acid has been adopted as esterification agent, sodi- um hydroxide as catalyst to the synthesize citrate starch from cassava starch with different activation time. The effects of mechanical activation time, microwave power, microwave irradiation time, water content, citric acid amount and sodium hydroxide amount on the esterification of cassava starch have been investigated respectively by the degree of substitute （DS） and the reaction efficiency （RE） of citrate starch as the evaluating parameter. The best conditions of preparation technique have been confirmed by anorthogonal test. The results showed that the mechanical activation decreased the dependent of microwave power, microwave irradiation time, water content, citric acid amount and sodi- um hydroxide amount; the DS and the RE of citrate starch activated for 60 min were twice more than citrate starch of native cassava. The optimum conditions of citrate starch preparation were as follows ：800 W microwave power, 35% water content, 5.0 min microwave irradiation times, 50% citric acid content and 6% sodium hydroxide content. On this condition,the DS of the products was 0. 399 8 and the RE was 88.84%. In addition, the structure of native starch, activated starch and high substituent citrate starch were further characterized by adopting fourier transform in- frared and Xray diffraction.

关 键 词：微波辐射 机械活化 柠檬酸酯淀粉 取代度 反应效率 

分 类 号：TS235.9[轻工技术与工程—粮食、油脂及植物蛋白工程]