Gelatin-based films containing hydrophobic plasticizers and saponin from Yucca schidigera as the surfactant |
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Authors: | Caroline Andreuccetti Rosemary A Carvalho Carlos RF Grosso |
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Affiliation: | 1. Department of Foods and Nutrition, Faculty of Food Engineering, P.O. Box 6121, University of Campinas, UNICAMP, 13083-862 Campinas, SP, Brazil;2. Food Engineering Department, ZEA-FZEA, P.O. Box 23, University of São Paulo, USP, 13635-900 Pirassununga, SP, Brazil |
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Abstract: | The aim of this study was to evaluate the incorporation of hydrophobic plasticizers (acetyltributyl citrate – ATB, tributyl citrate – TB and acetyltriethyl citrate – ATC) in a matrix of gelatin, using the saponin extracted from Yucca schidigera (yucca) as emulsifier, in the production of biodegradable emulsified films using the casting technique. High levels of hydrophobic plasticizers were incorporated, reaching up to 75% of plasticizer in relation to the protein (w/w) for ATB and TB, and up to 60% for ATC. The minimum values of water vapor permeability were 0.08, 0.07 and 0.06 g mm m?2 h?1 kPa?1 for ATB, TB and ATC respectively, with no significant differences (p > 0.05). The water solubility of the films ranged from 21% to 59.5%. Although the WVP decreased, both scanning electron microscopy and laser scanning confocal microscopy indicated that the incorporation of the hydrophobic plasticizers did not occur homogeneously in the film matrix. |
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