摘要
以玉米淀粉糊精为原料在高温下与柠檬酸发生缩聚反应玉米淀粉糊精分子通过柠檬酸酯键聚合形成交联聚糊精结果表明交联聚糊精呈现出非晶高聚物衍射图谱无有序的结晶结构分子量分析结果显示交联聚糊精的重均分子量分别为25270、188200及106200数均分子量分别为8086、6517及3160傅立叶红外分析结果表明交联聚糊精在1731cm-1附近出现柠檬酸酯键中羰基(C O)的响应在1HNMR图谱中的σ2792ppm处检测到柠檬酸亚甲基(CH2)的响应相对应地在13C NMR图谱中的σ43.321 ppm位置上也检测到亚甲基(CH2)的信号峰并且在13C图谱中的σ165.927ppm处出现柠檬酸中酯键(COO)的响应吸湿性分析表明交联聚糊精具有良好的吸湿效果可作食品保鲜剂交联聚糊精的流动曲线符合幂律方程τ=kεn(n<1)表现出剪切稀化现象.
Polydextrin was prepared from dextrin through an esterified reaction using citric acid and sorbitol.Esterification caused the dextrin molecules crosslinked and polymerized through citric acid ester bonds.Dex trins with three different DE values obtained by enzymatic hydrolyzed corn starch were used as reaction ma terial.The results showed that cross linked polydextrin had an unordered crystal structure with a polymer diffraction spectrogram.The results of HPLC MALLS RI revealed that the weight average molecular weights of the three cross linked polydextrin were 188200106200 and 25270 respectively and the number average molecular weights were 80866517 and 3160 respectively.Fourier infrared results showed that cross linked polydextrin exhibited an absorption peak of carbonyl(C O)in the ester bond at 1731.29cm-1.Acitricacidmethylene(CH2)signalpeakappearedatσ2792ppminthe 1HNMR spectrum.Correspondingly the ester bond(COO)and methylene(CH)signal peaks in the citric acid 2 structure appeared inσ165.927 ppm andσ43.321 ppm in 13C NMR respectively.These results indicated that poly maltodextrin was linked by a citric acid ester bond.The moisture absorption rate of cross linked poly dextrin increased with the increase of the DE values of the raw dextrin and the relative humidity of the envi ronment.The melt flow curve of polydextrin conformed to the power law equationτ=kεn(n<1).
作者
刘亚伟
炊宁玉
武小辉
刘洁
LIU Yawei;CUAN Ningyu;WU Xiaohui;LIU Jie(School of Food Science and Technology,National Engineering Laboratory for Wheat and Corn Further Processing,Henan University of Technology,Zhengzhou 450001,China)
出处
《河南工业大学学报（自然科学版）》
CAS
北大核心
2019年第6期39-46,共8页
Journal of Henan University of Technology：Natural Science Edition
基金
国家公益性行业(粮食)科研专项(201313011-2)
河南工业大学青年骨干教师培育计划(21420004)
关键词
交联聚糊精
糊精
分子量
特性
crosslinked polydextrin
dextrin
molecular weight
property
作者简介
刘亚伟(1960-),男,河南夏邑人,教授,研究方向为粮食资源转化与利用;通信作者:刘洁,副教授,E-mail:gongda8407@163.com。
