Characterization and antimicrobial analysis of chitosan-based films |
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Authors: | I Leceta P Guerrero I Ibarburu MT Dueñas K de la Caba |
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Affiliation: | 1. BIOMAT Research Group, University of the Basque Country (UPV/EHU), Department of Chemical and Environmental Engineering, Polytechnic School, Donostia-San Sebastián, Spain;2. University of the Basque Country (UPV/EHU), Department of Applied Chemistry, Faculty of Chemistry, Donostia-San Sebastián, Spain |
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Abstract: | Chitosan-based films for food packaging applications were prepared by casting and dried at room temperature or heat-treated in order to study functional properties and antimicrobial activity. In all cases, films were flexible and transparent, regardless of chitosan molecular weight, glycerol content, and temperature. Regarding antimicrobial activity, chitosan film forming solutions showed antimicrobial behaviour against Escherichia coli and Lactobacillus plantarum. It was also observed that the bacteriostatic property of chitosan-based films against bacteria employed in this study was notably affected by temperature. Moreover, temperature produced significant variation in the functional properties of chitosan-based films, such as colour, wettability, resistance against UV light and mechanical properties. In good agreement with this behaviour, total soluble matter (TSM), fourier transform infrared (FTIR) spectroscopy, thermo-gravimetric analysis (TGA) and X-ray diffraction (XRD) results suggested a change in the chemical structure of chitosan films, possibly due to Maillard reaction when heat treatment was used. |
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Keywords: | Chitosan Biodegradable films Antimicrobial activity Maillard reaction |
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