Abstract
Antimicrobial film is one of the most promising active packaging materials that can maintain the quality and extend the shelf life of food products. It can be prepared by incorporating antimicrobial agents into films. In this work, antimicrobial films were fabricated by blending bacterial cellulose (BC) suspension as a matrix, chitosan as a natural antimicrobial agent, carboxymethyl cellulose (CMC) as a homogeniser and glycerol as a plasticiser. All components were mixed and degassed before casting and drying at 40°C in an oven. As a control, film without chitosan was also cast. Scanning electron microscopy (SEM) revealed smooth and dense surface morphologies for BC-based films containing chitosan. Fourier transform infrared spectroscopy (FT-IR) confirmed the presence of chitosan in BC-based films, while X-ray diffraction (XRD) revealed that adding chitosan influenced their crystallinity. Furthermore, incorporating chitosan increased the insoluble matter and water vapour transmission rate (WVTR) of the films. The tensile strength was slightly increased, while the elongation at break was slightly decreased by adding chitosan. Antimicrobial testing demonstrated that incorporating chitosan into BC-based films successfully reduced the growth of microbes. Based on this result, BC/chitosan films can be considered as a potential candidate for antimicrobial films.
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Acknowledgment
The authors gratefully acknowledge financial support from Indonesian Institute of Sciences. We also would like to thank Research Unit for Clean Technology for instrumentation facilities throughout the experimental session.
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Indriyati contributed as the main contributor for this work. All authors read and approved the final paper.
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Indriyati, Dara, F., Primadona, I. et al. Development of bacterial cellulose/chitosan films: structural, physicochemical and antimicrobial properties. J Polym Res 28, 70 (2021). https://doi.org/10.1007/s10965-020-02328-6
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DOI: https://doi.org/10.1007/s10965-020-02328-6