Overall, an increased gelatin concentration in the mixture provided an increase in thickness, mechanical resistance and in the WVP from the tested bioplastics. The opacity of film coatings was also reduced by adding gelatin. The WVP values were lower for films plasticized with SOR. The fact that the SOR may have been incorporated into the main polymeric matrix in a higher level than glycerol could facilitate the understanding of the low WVP values and high traction resistance. This characteristic also would result in higher flexibility to the GLY-plasticized biofilms. All the gelatin and corn starch films plasticized with SOR or GLY showed high solubility in acid medium (100%).
Regarding the use of coatings in refrigerated grapes, its use was effective as natural a postharvest treatment with the aim to extend the shelf-life of grapes and maintain fruit quality, particularly for reducing the total weight loss. The tasting session showed that the coatings did not influence consumer acceptance. Given that the selected film components present low cost and high biocompatibility, the industry could apply optimized film for commercial purposes.