Effects of Different TiO Nanoparticles Concentrations on the Physical and Antibacterial Activities of Chitosan-Based Coating Film.

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.