Carboxymethylcellulose-montmorillonite nanocomposite films activated with murta (Ugni molinae Turcz) leaves extract

► The addition of MMT to CMC films, improve their physicochemical properties. ► Extract of murta as a solvent produce active films with antioxidant properties. ► Murta active compounds plasticized the films modifying the ratio permeability to gases.