Vigilancia Tecnológica

Montmorillonite was modified with copper for obtaining clays at different valence states (MtCu2+ and MtCu0). They were incorporated into PLA films through melt extrusion. The structural, optical, thermal, and mechanical properties of films depended on the valence of clay, where MtCu2+ was better dispersed in the polymer matrix and MtCu2+/PLA reduced over 2 log10 of Gram+ and Gram? bacterial growth.AbstractPolymer?based nanocomposites loaded with metal nanoparticles are an interesting alternative for the development of antimicrobial food packaging. However, affinity and dispersion of metal nanoparticles could be improved using nanoclays. Therefore, nanocomposite films based on poly(lactic acid) (PLA) and copper modified?montmorillonite were developed by melt?extrusion technique. Copper?modified montmorillonite at different valence states (MtCu2+ and MtCu0) were prepared. The nanocomposites were evaluated by means of their structural, optical, thermal and antimicrobial properties. Results showed that both nanoclays were intercalated in PLA but MtCu2+ was better dispersed. Therefore, color change ?E??9 for MtCu0/PLA nanocomposites compared with PLA. Moreover, Cu0 nanoparticles in the matrix accelerated the thermal degradation and decreased the ductility of nanocomposites. On the other hand, both nanocomposites were able to reduce over 2 log10 of Escherichia coli growth and MtCu2+/PLA showed a higher antimicrobial activity against Listeria innocua. These results showed the potential of nanocomposite films based on PLA and copper?modified montmorillonite for antimicrobial food packaging applications.