Abstract
Rye flour based edible films were produced by using glycerol and ethylene glycol as plasticizers at concentrations ranging between 40 to 100% (w/w of rye flour). The structural, mechanical, physical, and chemical properties of the films were investigated. The results showed that increasing the plasticizer concentration resulted in a greater the thickness, water vapor permeability, and water solubility of the films. While water vapor permeability and solubility were not affected by the plasticizer type, the thickness of glyserol-containing films was significantly higher. Good mechanical properties were obtained for the composites, where the greatest tensile strength of 7.47 MPa was measured in the film containing 40% ethylene glycol (w/w rye flour) and the highest elongation of 69.3% was observed in the film containing 100% glycerol (w/w rye flour). The increase in added plasticizer had an adverse effect on antioxidant activity and the total phenolic content of the films, due to probable dilution effect in the composites.
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