The montmorillonite used in this study is a food contact compliant
commercial organomodified clay with substances with affinity to polymeric
matrix (Nanobioter® AE21) supplied as a powder. No further
details of clay modification were disclosed by the manufacturer. Functionalized
montmorillonites, were prepared by combining untreated
nanoclays provided by Nanobiomatters S.L. (Paterna, Spain) and 20%
of PVPP-WS extract, so that the content of PVPP-WS extract used to
produce the films minimized consumption of natural extract.