负载茶多酚的三元共混膜液与膜性能分析

Preparation and Analysis of Ternary Blend Solutions and Films Loaded with Tea Polyphenol

摘要:

将不同质量分数的活性成分茶多酚加入到壳聚糖/玉米醇溶蛋白共混膜液中，采用溶剂浇铸法制备得到一种三元共混膜。分析茶多酚对壳聚糖/玉米醇溶蛋白膜液静态和动态流变学特性、粒径分布以及凝胶强度的影响；测定三元共混膜的机械性能和阻隔性能；同时对共混膜进行形貌、红外、晶体学和热力学分析。结果表明：茶多酚与成膜基质之间的交互作用使膜液中产生了高度纠缠网络结构，有利于均匀稳定共混膜的形成；负载适量茶多酚对膜性能具有良好的改善作用，当茶多酚负载量为1%时，膜材料具有最佳的抗拉强度10.966 Mpa；SEM和XRD结果显示茶多酚与壳聚糖、玉米醇溶蛋白之间发生了强烈的相互作用，具有良好的相容性；FT-IR图谱显示茶多酚与成膜基质之间产生了氢键相互作用；通过热力学分析发现负载茶多酚质量分数为0.5%和2%时，共混膜具有较高的热稳定性。

Abstract:

A noval packaging material was prepared by adding tea polyphenol into chitosan/zein matrix and the solution casting method. The effect of tea polyphenol on the static and dynamic rheological properties, particle size and gel strength of blend solutions was investigated. And the mechanical and barrier properties of blend films were analyzed. Moreover, morphology, crystallography and thermomechanical analysis were performed. The results showed that the interaction of tea polyphenol and polymer matrix facilitated the formation of highly entangled network structure, which was benificial to the development of uniform blend films. It was apparent that the properties of films were improved by loading moderate tea polyphenol, and the tensile strength reached the highest value (10.966 Mpa) when the load of tea polyphenol was 1%. The results of SEM and XRD revealed the preferable miscibility among tea polyphenol, chitosan and zein on account of strong interaction. Furthermore, FT-IR showed that hydrogen bond interaction was observed between tea polyphenol and chitosan, zein. And the thermomechanical analysis demonstrated that blend films presented better heat stability when the mass fraction of tea polyphenol was 0.5% and 2% respectively.