Composite and bi-layer films based on gelatin and chitosan |
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Authors: | S. Rivero, M.A. Garcí a,A. Pinotti, |
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Affiliation: | aCentro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), CONICETCCT, UNLP, 47 y 116, 1900 La Plata, Buenos Aires, Argentina;bFacultad de Ingeniería, UNLP, La Plata (1900), Argentina |
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Abstract: | The aims of this work were: to develop composite, bi-layer and laminated biodegradable films based on gelatin and chitosan, to determine film barrier and mechanical properties and to characterize their microstructure.Gelatin and chitosan concentrations used were 7.5% and 1% (w/w), respectively. Glycerol (0.75%) was added as plasticizer.Physicochemical properties such as moisture content, transparency and color were analyzed. Composite and bi-layer systems showed a compact structure indicating a good compatibility between components.Water vapor permeability (WVP) was independent of film thickness up to 120 μm for gelatin films and 60 μm for chitosan ones. Both, bi-layer and laminated systems resulted effective alternatives to reduce WVP of composite films (at least 42.5%). Bi-layer systems showed better mechanical properties than laminated ones. The resistance at break increased from 54.3 for composite to 77.2 MPa for bi-layer films, whereas elongation at break values of both composite and bi-layer films were similar (2.2–5.7%). |
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Keywords: | Biodegradable films Chitosan Gelatin Bi-layer and laminated systems Barrier and mechanical properties |
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