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Resumen:
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The objective of this paper was to study the effect of plasticizers and their concentrations on the thermal and functional properties of gelatin-based films. Four polyols (glycerol—GLY, propylene glycol—PPG, di- DTG and ethylene glycol—ETG) were tested in five concentrations: 10, 15, 20, 25, and 30 g plasticizer/100 g of gelatin. For thermal analysis, the films were conditioned in desiccators with silica gel and for functional properties (mechanical properties, water vapor permeability, color and opacity) characterizations, the films were conditioned at 25 ºC and 58% relative humidity. The results were discussed in terms of ‘plasticizer efficiency’ meaning plasticizer content effect and also in terms of ‘plasticizer effect’ meaning the plasticizer type effect on the properties.
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