Main Article Content
In this study, new composite materials from cellulose, chitosan, modified chitosan, and immobilized silver ions have been developed to obtain an active packaging. In the first step, modified chitosan was prepared by graft-copolymerization with 2-acrylamido-2-methyl propanesulfonic acid monomer (AMPs) as a chelating agent. The sulfonate group was used in chelation with silver ion for reducing the leakage silver ions from the packaging. Scanning electron microscope (SEM) and X-ray diffraction (XRD) pattern confirmed the presence of silver ions in the cellulose composite. The effects of different concentrations (0.015-0.6 wt%) of silver ions on antimicrobial activity have been investigated. It was observed that the chelation of silver ions resulting in the content of 0.015 wt% showed a good potential for antimicrobial activity against both Gram-positive and Gram-negative bacteria. Furthermore, the chelation with sulfonate groups resulted in about 0.07-0.3 % of silver ions being released from the composite to aqueous solution in the pH range 4-12. In summary, the obtained packaging exhibited very low release of the toxic metal ions. The materials also exhibited good antimicrobial and mechanical properties. Therefore, this composite material displays the potential use as active packaging in food applications.
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