Properties of Gelatin-Based Films with AddedEthanol–Propolis ExtractLWT - Food Science and TechnologyVolume 51, Issue 1, April 2013, Pages 104–110Considering the possibility of using propolis as a naturalbioactive compound, and the growing interest in active and biodegradablepackaging materials, gelatin-based films plasticized with sorbitol and added ofethanol–propolis extract (EPE) were produced. Four different concentrations ofEPE (0, 5, 40 or 200 g/100 g of gelatin) were analyzed. The effect ofconcentrations of EPE were evaluated on: mechanical properties, solubility,moisture content, water vapor permeability, scanning electron microscopy andinfrared spectroscopy characteristics, stability of polyphenol concentrations,and antimicrobial activity against Staphylococcus aureus. EPE incorporation tothe films promoted reduction in rupture tension and water vapor permeability,besides other microstructural changes, when compared with the control films (0g of EPE/100 g of gelatin). Activity against S. aureus was observed in filmswith 40 and 200 g of EPE/100 g of gelatin. These films kept their antimicrobialactivity and polyphenol concentration for 177 days of storage.Highlights►Effect of different concentrations of ethanol–propolis extract on gelatinfilms. ► Extractincorporation practically did not change the properties of films. ► Films with ethanol–propolis extract were effective against Staphylococcus aureus.► The antimicrobialeffect of ethanol–propolis extract continued for177 days.
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