Abstract
SummaryIn order to obtain the chitosan (CS) coatings with excellent physicochemical properties and antibacterial abilities, the CS coatings were modified by in situ modification nano‐CaCO3 and nano‐TiO2. The coatings were characterised, and their physicochemical properties were measured. The antibacterial mechanism of the coatings was investigated with the Shewanella putrefaciens and Pseudomonas aeruginosa. The nano‐CaCO3/TiO2 can improve the tensile strength and elongation at break of the CS coatings. In addition, the carbon dioxide permeability of the CS coatings is increased after modification by nano‐TiO2. The nano‐CaCO3/TiO2/CS coating can effectively disrupt the integrality of bacterial cell membrane and improve their permeability, reduce the cellular enzyme activities, and affect the synthesis and expression of the bacterial protein. Eventually, the growth and reproduction of S. putrefaciens and P. aeruginosa are inhibited. The in situ modified nano‐CaCO3/TiO2/CS coatings have potential to be applied in the field of preservation of aquatic products.
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