Chitosan-ZnO bionanocomposites: In situ preparation, characterization and antibacterial properties
2019
Hojjat Toiserkani
Chitosan (CT) as a biopolymer with high antibacterial, biocompatibility and biodegradability can be selected as a useful and effective polymer matrix in composite materials. In this study, chitosan-ZnO (CT/ZnO) bionanocomposites have been successfully fabricated through the in situ formation of ZnO nanoparticles within a chitosan matrix. CT-ZnO bionanocomposites were prepared using zinc acetate and sodium hydroxide as the source of ZnO nanoparticles in chitosan matrix by direct precipitation method. The structure of the nanocomposites with different ZnO contents (0 wt%, 5 wt%, 10 wt% and 15 wt%) were characterized by fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The antibacterial activity of bionanocomposite films was tested against gram-positive bacteria (Staphylococcus aureus) and gram-negative bacteria (Escherichia coli). The results of CT/ZnO BNCs revealed that the thermal and antibacterial properties obviously improved the presence of ZnO NPs in comparison with the neat chitosan and this increase was higher when the NP content increased.
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