The results of this work show that functional properties of
chitosan-based films are adequate for packaging purposes. Films
are transparent and resistant against UV light, which suggests the
potential preventive effect on the retardation of product oxidation
induced by UV light. In addition, films are an effective barrier
against water vapour and oxygen, which helps to maintain the
quality of the product. Moreover, the addition of glycerol improves
film flexibility with a slight increase in the hydrophilic character
of the films. These improvements in functional properties can be
explained by the interactions glycerol–chitosan shown by TSM and
FTIR analysis.