核桃青皮多酚改性壳聚糖-明胶复合膜的制备及性能结构表征

Preparation and Structure Characterization of Chitosan - Gelatin Composite Membrane Modified by Walnut Green Husk Polyphenol

摘要:

制备了一系列不同配比核桃青皮多酚改性壳聚糖-明胶复合膜，研究了改性复合膜的力学性能、溶解性、水蒸气透过率（WVP）、DPPH自由基清除率，并通过X射线衍射、红外光谱分析和电镜扫描形貌分析，考察了改性复合膜的内部结构和相容性；结果表明当多酚用量为2%，壳聚糖：明胶为比例为45:55时改性复合膜的总综合性能最佳，其抗张强度、溶解性、WVP、DPPH自由基清除率分别为49.8MPa、16.5%、0.15(g.mm)/(h.m2.kPa)、80.40%，X射线衍射、红外光谱和电镜扫描结果分析亦表明：多酚与壳聚糖和明胶分子发生了交联，结构致密，相容性良好，核桃青皮多酚能够改善改性复合膜内部的结构并提升其综合性能。

Abstract:

A series of chitosan-gelatin modified by walnut green husk polyphenols with different ratios of chitosan to gelation were prepared,and the mechanical properties, solubility,water vapor permeability (WVP) and DPPH free radical clearance of the modified composite membranes were investigated. The structure and compatibility of the modified composite membranes were analyzed by X-ray diffraction(XRD),infrared spectroscopy (IR)and Scanning Electron Microscope (SEM).The results show that the comprehensive performance of modified composite membrane is the best when the dosage of polyphenols is 2% and the ratio of chitosan to gelatin is 45:55. The tensile strength, solubility, WVP, DPPH free radicals clearance of the modified composite membrane respectivily are 49.8 MPa, 16.5% ,0.15 (g. m.)/(h.m2. kPa) and 80.40%. The crosslinking of polyphenols with chitosan and gelatin and the compact structure also with the good compatibility of the modified composite membrane are indicated by XRD,IR and SEM. The research illustrates that walnut green husk polyphenols can improve the internal structure and promote the comprehensive performance of the modified composite membrane.