Effects of Different TiO2Nanoparticles Concentrations on the Physical and Antibacterial Activities of Chitosan-Based Coating Film

In this investigation, the effect of different concentrations of titanium dioxide (TiO2) 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(2)NPs were successfully dispersed into the chitosan matrix, and that the roughness of the chitosan-TiO(2)nanocomposites were significantly reduced. Moreover, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses indicated that the chitosan interacted with TiO(2)NPs and possessed good compatibility, while a thermogravimetric analysis (TGA) of the thermal properties showed that the chitosan-TiO(2)nanocomposites with 0.05% TiO(2)NPs concentration had the best thermal stability. The chitosan-TiO(2)nanocomposite exhibited an inhibitory effect on the growth ofEscherichia coliandStaphylococcus aureus. This antimicrobial activity of the chitosan-TiO(2)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(2)NPs might become a potential packaging system for prolonging the shelf-life of fruits and vegetables.