It is important to note that all film samples were conditioned at
58% RH before the mechanical tests. It was observed that the
equilibrium moisture of the film FG30 (0.20 g water/g dry solids)
was higher than the moisture of the film FS30 (0.12 g water/g dry
solid). As water is a powerful plasticizer in starchy and protein rich
materials, films with glycerol are also plasticized by water, due to
their higher moisture, explaining their lower tensile strength and
lower Young modulus, and also their higher elongation capacities.