Solubility increased as glycerol content increased. Glycerol causes film extensibility because it inserts between polysaccharide chains, so it impacts water absorption. The solubility of the banana flour films was high and was reduced when glycerol and banana flour content increased.
Amylose-amylose, amylopectin-amylopectin and
amylose-amylopectin interactions take place during drying of the films, which reduces the amount of hydrophilic groups available for interaction with water (Pelissari et al., 2013b).