Xing Yage, Li Xuanlin, Guo Xunlian, Li Wenxiu, Chen Jianwen, Liu Qian, Xu Qinglian, Wang Qin, Yang Hua, Shui Yuru, Bi Xiufang
Key Laboratory of Grain and Oil Engineering and Food Safety of Sichuan Province, College of Food and Bioengineering, Xihua University, Chengdu 610039, China.
Department of Food Science and Engineering, College of Landscape Architecture, Shangqiu University, Shangqiu 476000, China.
Nanomaterials (Basel). 2020 Jul 13;10(7):1365. doi: 10.3390/nano10071365.
In this investigation, the effect of different concentrations of titanium dioxide (TiO) nanoparticles (NPs) on the structure and antimicrobial activity of chitosan-based coating films was examined. Analysis using scanning electron microscopy (SEM) and atomic force microscopy (AFM) revealed that the modified TiO NPs were successfully dispersed into the chitosan matrix, and that the roughness of the chitosan-TiO nanocomposites were significantly reduced. Moreover, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses indicated that the chitosan interacted with TiO NPs and possessed good compatibility, while a thermogravimetric analysis (TGA) of the thermal properties showed that the chitosan-TiO nanocomposites with 0.05% TiO NPs concentration had the best thermal stability. The chitosan-TiO nanocomposite exhibited an inhibitory effect on the growth of and . This antimicrobial activity of the chitosan-TiO nanocomposites had an inhibition zone ranging from 9.86 ± 0.90 to 13.55 ± 0.35 (mm). These results, therefore, indicate that chitosan-based coating films incorporated with TiO NPs might become a potential packaging system for prolonging the shelf-life of fruits and vegetables.
在本研究中，考察了不同浓度的二氧化钛（TiO₂）纳米颗粒（NPs）对壳聚糖基涂膜结构和抗菌活性的影响。使用扫描电子显微镜（SEM）和原子力显微镜（AFM）进行分析表明，改性TiO₂ NPs成功分散到壳聚糖基质中，且壳聚糖-TiO₂纳米复合材料的粗糙度显著降低。此外，X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）分析表明，壳聚糖与TiO₂ NPs相互作用且具有良好的相容性，而热重分析（TGA）对热性能的研究表明，TiO₂ NPs浓度为0.05%的壳聚糖-TiO₂纳米复合材料具有最佳的热稳定性。壳聚糖-TiO₂纳米复合材料对[具体微生物名称1]和[具体微生物名称2]的生长表现出抑制作用。这种壳聚糖-TiO₂纳米复合材料的抗菌活性的抑菌圈范围为9.86±0.90至13.55±0.35（mm）。因此，这些结果表明，掺入TiO₂ NPs的壳聚糖基涂膜可能成为延长水果和蔬菜货架期的潜在包装系统。
