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