Abstract
Herein, we developed poly (vinyl alcohol) (PVA)/regenerated chitosan (RCs) blend films (PRCs) using a solution casting method. Synthesized RCs have highly positive surface charges, in contrast to pure chitosan (Cs). PVA was blended separately with different compositions of RCs and Cs. The PRCs films possessed more potent physicochemical and functional properties than the PVA/Cs (PCs) films for all compositions. The barrier, antioxidant, and antibacterial properties were strongly dependent on the RCs amount. The crystallinity significantly decreased with increasing RCs or Cs amount in the blend films. The barrier (oxygen and water) properties of the PRCs were stronger than those of the corresponding PCs; this may be due to the additional hydrogen bonding and the uniform dispersion of RCs in the PVA matrix. In addition, the PRCs films exhibited strong free radical-scavenging activity (DPPH assay). The PRCs73 sample exhibited enhanced antibacterial efficacy against Escherichia coli (100 %) due to the presence of numerous positive charges on the surface of the RCs. Therefore, PRCs films offer a wide range of potential uses in biomedicine and food packaging.
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