Packing and Packaging Materials Department, National Research Centre, 33 El Bohouth St. (former El Tahrir st.), Dokki, Giza, Egypt, P.O. 12622.
Cellulose and Paper Department, National Research Centre, 33 El Bohouth St. (former El Tahrir st.), Dokki, Giza, Egypt, P.O. 12622.
Int J Biol Macromol. 2015 May;76:25-32. doi: 10.1016/j.ijbiomac.2015.02.016. Epub 2015 Feb 20.
Zinc oxide (ZnO) nanoparticle was successfully synthesized using hydrothermal method as well as, silver (Ag) nanoparticle was direct prepared during chitosan nanocomposites preparation. Chitosan films were investigated by recognized the effect of kinds of acids (formic or acetic acid). Correspondingly, using of concentrated NaOH was checking for facilitating de-casting of the films. Utilization of formic acid arisen higher quality films than those films produced using acetic acid as solvent. Optimization was based on the mechanical properties for both types of acids solvent. Furthermore, the elasticity of the prepared films was enhanced by blending hydroxyl ethylcellulose (HEC) with chitosan. Loading the films by silver and zinc oxide nanoparticles (Ag-NPs and ZnO) was achieved during the preparation of films under the optimum conditions. Characterizations of the prepared ZnO nanoparticles and the prepared nanocomposites films were investigated by FT-IR, XRD, SEM, TEM and EDAX. Chitosan nanocomposite films displayed good Antimicrobial activity against Staphylococcus aureus, Escherichia coli, Salmonella typhamrium, Bacillus cereus, and Listeria monocyte. Therefore, these films can be used for packaging applications.
氧化锌（ZnO）纳米粒子成功地通过水热法合成，并且在壳聚糖纳米复合材料制备过程中直接制备了银（Ag）纳米粒子。通过研究壳聚糖薄膜，发现了使用各种酸（甲酸或乙酸）的效果。相应地，使用浓氢氧化钠检查薄膜的脱铸效果。与使用乙酸作为溶剂相比，使用甲酸可以产生质量更高的薄膜。优化是基于两种酸溶剂的机械性能。此外，通过将羟乙基纤维素（HEC）与壳聚糖混合，可以增强所制备的薄膜的弹性。在最佳条件下制备薄膜时，可以实现银和氧化锌纳米粒子（Ag-NPs 和 ZnO）的负载。通过 FT-IR、XRD、SEM、TEM 和 EDAX 对制备的 ZnO 纳米粒子和制备的纳米复合材料薄膜进行了表征。壳聚糖纳米复合材料薄膜对金黄色葡萄球菌、大肠杆菌、伤寒沙门氏菌、蜡状芽孢杆菌和单核细胞增生李斯特菌显示出良好的抗菌活性。因此，这些薄膜可用于包装应用。
