细菌纤维素-甲壳素-玉米醇溶蛋白颗粒复合膜的制备与表征

Preparation and Characterization of the Bacterial Cellulose-Chitin-Zein Particle Composite Membrane

为制备功能化细菌纤维素基复合膜,本研究以细菌纤维素(Bacterial Cellulose,BC)、甲壳素纳米纤维(Chitin Nanofibrils,CH)、玉米醇溶蛋白纳米颗粒(Zein Nanoparticles,ZN)为原料,采用高效的快速抄纸技术(抽滤与热压结合)制备BC-CH-ZN复合膜。研究BC:CH质量比、ZN添加量对复合膜结构和性能的影响。进一步在ZN中加入百里香酚(Thymol,TH),考察TH添加量对膜的热稳定性及抗菌特性的影响。结果表明,相对于纯BC膜,当BC:CH质量比从10:0减少至5:5时,复合膜的抗拉强度(从183.45 MPa到171.38 MPa)和断裂伸长率(从2.58%到2.11%)未发生明显变化。扫描电镜、厚度、红外光谱和元素分析结果共同证实ZN能有效地包覆在BC-CH复合膜内,接触角数据变化(从49.15°增加至77.28°)表明其改善了BC膜过于亲水的缺陷。TH的加入不影响BC-CH-ZN复合膜的热稳定性,且能为复合膜提供更好的抗菌效果。因此,复合CH、ZN和TH制备BC基新型功能膜材料可以改善BC过于亲水的缺陷,为开发具有更多功能特性的BC复合膜提供指导意义。

Bacterial cellulose-based functional nanocomposite membranes were fabricated using an efficient and scalable papermaking process(filtration and hot pressing),with bacterial cellulose(BC),chitin nanofibrils(CH),and zein nanoparticles(ZN)as nanosized building blocks.The effects of the mass ratio of BC to CH and the content of ZN on the structure and properties of the composite membranes were studied.The effect of incorporating thymol(TH)on the thermal stability and antibacterial properties of the membranes were further investigated.The results showed that the tensile strength(from 183.45 MPa to 171.38 MPa)and elongation at break(from 2.58%to 2.11%)of the composite film did not significantly change when the mass ratio of BC to CH was decreased from 10:0 to 5:5,respectively.Scanning electron microscopy,thickness evaluation,Fourier transform infrared spectroscopy,and elemental analysis confirmed that ZN could be effectively incorporated into the BC-CH membranes.Further,the contact angle data(from 49.15°to 77.28°)indicated that the surface hydrophobicity of the composites was improved in the presence of ZN.The thermal stability of the composite membranes was not affected by the addition of thymol,but their antibacterial effect was improved.Thus,the surface hydrophobicity of BC can be improved by compositing with CH,ZN,and TH to prepare new BC-based functional membrane materials.These results can provide guidance for the development of BC composite membrane with additional functional properties.