The use of silver-based materials for their strong antibacterial properties has long been recognized, but concerns about their potential toxicity have led to the need for alternative, safe, and effective antibacterial systems. Against this backdrop, a team of researchers has developed a novel synergistic antibacterial system using arginine-modified chitosan (ACS) composite silver-loaded MMT (AgNPs@MMT) for food preservation. This article explores this promising solution in detail.
The researchers used tea polyphenols as a reducing agent and montmorillonite (MMT) as a fixative to synthesize AgNPs@MMT. They then grafted arginine onto the C2-NH2 groups of chitosan chains through N-acylation reaction to obtain ACS. Finally, they mixed AgNPs@MMT with ACS and gelatin G to prepare the composite film.
The researchers found that the work successfully prepared AgNPs with a size of 6.72 ± 4.66 nm and an ACS grafting degree of 0.153. They also validated the synergistic antibacterial effect of ACS and AgNPs@MMT through FIC indexes.
Even when the addition of ACS and AgNPs@MMT were reduced by 75% and 79.1%, respectively, the antibacterial rate still reached 99.9%. The ACS/G/AgNPs@MMT-2 composite film exhibited excellent mechanical properties, water vapor/ultraviolet barrier performance, antioxidant activity, degradation performance, and biocompatibility.
Furthermore, due to the synergistic effect, the antibacterial rate of the ACS/G/AgNPs@MMT-2 film reached 99.24 ± 0.19% and 99.49 ± 0.40%. Significantly, the slow release of silver (only about 11.27% released within 20 days) enhances the longevity of the antibacterial effect.
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