Development and optimization of antimicrobial active films produced with a reinforced and compatibilized biodegradable polymers

Biodegradable polymers can produce sustainable films to substitute regular food packaging as an answer to environmental concerns and food preservation. Nisin Z (NIS Z) bioactive compound can be embedded into biodegradable polymers, such as polyvinyl alcohol (PVA) and starch, to produce antimicrobial eco-friendly active films. Cellulose nanocrystals (CNC) and maleic anhydride (MA) have been added into matrix films, as reinforcement compounds, to improve polymer's performance. For this reason, Corn Starch-PVA biodegradable film blends were produced by the incorporation of CNC, MA and NIS Z according the concentration values obtained from the Central Composite Designs. Desirability function was stablished promoting a maximization of antimicrobial effects and mechanical features and a minimization of barrier responses. Film topographies were examined using a profilometer and a scanning electron microscopic and a heterogeneous surface patterns were observed. Moreover, the active films were also evaluated by X-ray diffraction and color analysis. L. monocytogenes control efficiency by the films highlighted the potential to produce active biodegradable films as an alternative to the addition of food preservatives against this bacteria's growth.