壳聚糖及壳聚糖-柠檬酸结构性质和功能性质的比较  

Comparison of Structural and Functional Properties of Chitosan and Chitosan-Citric Acid Complex

作　　者：崔文慧[1] 郭芹[1] 李庆鹏[1] 靳婧[1] 哈益明[1] CUI Wenhui;GUO Qin;LI Qingpeng;JIN Jing;HA Yiming(Key Laboratory of Agro-products Processing and Quality Control, Ministry of Agriculture,Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing 100193, China)

机构地区：[1]中国农业科学院农产品加工研究所,农业部农产品加工与质量控制重点实验室,北京100193

出　　处：《食品科学》2017年第5期134-141,共8页Food Science

基　　金：农业部公益性行业科研专项(201303076、201503142-01)

摘　　要：将壳聚糖进行酰化改性制得壳聚糖-柠檬酸,测定其重均分子质量及水溶性,然后利用傅里叶变换红外光谱仪、扫描电子显微镜、热重分析仪、X-射线衍射仪及核磁共振仪对其进行结构表征,确证酰化反应的发生,并且探讨壳聚糖和壳聚糖-柠檬酸对重金属镉离子的吸附效果及对羟自由基和1,1-二苯基-2-三硝基苯肼自由基的清除效果。结果表明,与壳聚糖相比,壳聚糖-柠檬酸的重均分子质量和水溶性都明显增加;结构表征直接或间接证明壳聚糖与柠檬酸发生酰化反应,结构差异导致性质差异;壳聚糖-柠檬酸对重金属镉离子的吸附效果及对自由基的清除能力均优于壳聚糖。该研究为壳聚糖及其衍生物在实际中的进一步应用提供了一定的研究依据。Chitosan-citric acid complex was prepared by acylation reaction between chitosan and citric acid,and its weightaverage molar mass and water solubility were determined.Then,the structural characterization was investigated by Fourier transform infrared spectroscopy(FTIR),scanning electron microscopy(SEM),thermogravimetric analysis(TGA),X-ray diffraction(XRD)and nuclear magnetic resonance(NMR)to validate the occurrence of acylation reaction.In addition,we explored the adsorption efficiency of chitosan and its complex for cadmium ions and their scavenging capacity against hydroxyl and2,2-diphenyl-1-picrylhydrazyl(DPPH)free radicals.Results indicated that compared with chitosan,the weight averagemolar mass and water solubility of chitosan-citric acid complex significantly increased.At the same time,structural characterization directly or indirectly proved that citric acid was successfully introduced into chitosan via acylation reaction and the structure differences resulted in differences in the properties of chitosan and its complex.In addition,the adsorption efficiency for cadmium ions and free radical scavenging capacity of chitosan-citric acid complex were better than those of chitosan.This research can provide some evidence for the practical application of chitosan and its derivatives.

关 键 词：壳聚糖 壳聚糖-柠檬酸 结构性质 功能性质 

分 类 号：TS201.7[轻工技术与工程—食品科学]