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Ediblefilms have been studied as potential substitutes for conventional plastics in food packaging. Theirdevelopment provides a new alternative for the application of hydrocolloids, following global trends ofenvironmental preservation. Taking this into account, the aim of this study was to develop and evaluatephysicochemical properties (thickness, solubility in water and acid, water vapor permeability, opacity,tensile strength and elongation at break) of compositefilms based on corn starch (native, modified waxyor waxy) and gelatin, plasticized with glycerol or sorbitol. After this initial screening, the formulationpresenting the physicochemical properties more appropriate was applied as an edible composite coatingonto Red Crimson grapes to extend the shelf-life. The addition of gelatin significantly increasedmechanical strength, solubility in water, permeability to water vapor, and thickness of the biofilms, whilealso decreasing the opacity. Compositefilms prepared with sorbitol had significantly lower permeabilityto water vapor and higher tensile strength than thefilms plasticized with glycerol. Improved appearancewas observed in coated grapes after 21 days storage under refrigerated conditions, which had lowerweight loss than the control group. Sensory evaluation showed that all the coatings did not affectacceptability scores.
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