As expected, the increase in the glycerol concentration on the FFS produced films less stiff and rigid, and
more extendible; i.e., it caused a reduction on the tensile strength and increase of the elongation at break of films, respectively (Fig. 1). These trends were probably due to the reduction in interactions between the
biopolymers chains. This effect of the plasticizer concentration on the mechanical properties is well known
and broadly discussed in the literature