Development and characterization of sodium alginate composite films incorporating self-assembled cyclodextrin succinic acid/chitosan nanoparticles encapsulating resveratrol for blueberry preservation

Succinate cyclodextrin/chitosan nanoparticles (SCC NPs) loaded with resveratrol (Res) were successfully synthesized by self-assembly. Nanocomposite films were prepared by adding R-SCC NPs to sodium alginate (SA). The structure, physical and chemical properties, and antioxidant, antibacterial and biodegradability properties of the nanocomposite films were characterized. Scanning electron microscopy (SEM) results revealed that R-SCC NPs in 1–6 % were uniformly distributed in the SA film matrix. FTIR analysis revealed that the R-SCC NPs formed intermolecular hydrogen bonds with SA. The maximum tensile strength of the nanocomposite film was 44.24 ± 0.82 MPa, which was 153.50 % of that of the SA film. The addition of R-SCC NPs markedly enhanced the UV absorption capacity, antioxidant stability, and antibacterial activity of the nanocomposite films. In addition, because Res was encapsulated in the SCC NPs, control over the release from the composite film was achieved. This film has excellent biodegradability in soil and can regulate the soil microbial community. Furthermore, the developed film package can effectively prolong the expiry date of blueberries, so the SA film containing R-SCC NPs as active packaging has significant potential for maintaining food quality.