Development of MtCu2+/LDPE nanocomposites with antimicrobial activity for potential use in food packaging

The antimicrobial efficiency of novel MtCu2+/LDPE nanocomposites against Escherichia coli 0157:H7 n/t was tested in the present work. Montmorillonite modified with copper (MtCu2+) was obtained using cation exchange in solution and nanocomposite films were prepared by melt mixing in an extruder at 200°C with different compositions. Characterization of MtCu2+ and MtCu2+/LDPE nanocomposites was carried out using XRD, AA, TGA, DSC, and microbiological analysis. The clay polymer nanocomposites (CPN) were more stable at higher temperatures, resulting from the incorporation of MtCu2+ in the polymer. The results indicate that the antibacterial effect of the CPN increases with the proportion of MtCu2+ added, obtaining a 94% reduction when 4% of MtCu2+ was added to the polymer.