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Development of functional bacterial cellulose composites from Kombucha waste for biodegradable food packaging
Summary
Researchers developed biodegradable food packaging films from bacterial cellulose grown in kombucha waste, chemically enhancing the material to achieve stronger mechanical strength and better moisture and oxygen barriers than unmodified cellulose. Unlike conventional plastic packaging that persists for centuries, these films broke down within months, offering a practical way to reduce microplastic pollution from food packaging.
The aim of this study was to investigate the production of biodegradable bacterial cellulose (BC) composite films from kombucha production residues, providing a sustainable alternative to petrochemical-based food packaging. The widespread use of plastic packaging contributes to microplastic pollution, prolonged degradation periods, and environmental toxicity. To enhance its functional properties, BC was modified with BAC50, glycine, calcium chloride (CaCl₂), and cinnamaldehyde, resulting in a 112% increase in tensile modulus (8.9 MPa vs. 4.2 MPa for pure BC). The modified composite exhibited a 120% increase in tensile strength compared to pure BC, indicating enhanced stiffness due to CaCl₂ crosslinking. Additionally, the elongation at break decreased by 29%, confirming that crosslinking increased material rigidity while reducing ductility as well as strong antimicrobial activity, with zones of inhibition measuring 6.28 mm against Escherichia coli ATCC 8739 and 8.71 mm against Staphylococcus aureus ATCC 6538 (compared to 0 mm for unmodified BC). The composite exhibited 88.5% moisture absorption, a 37.6% reduction in water vapor transmission rate (0.283 g/m2/day compared to pure BC), and a 22.4% decrease in oxygen transmission rate (OTR: 433 cc/m2/day compared to pure BC), demonstrating improved barrier properties for food preservation. Thermal analysis (TGA, DSC) revealed a 25.13% improvement in thermal stability, indicating enhanced resistance to degradation at elevated temperatures. Furthermore, scanning electron microscopy (SEM) was used to understand the structure further more like the strand size which varied between. This study exemplifies a circular economy approach by upcycling kombucha waste into high-performance biodegradable materials, reducing reliance on fossil fuel-derived plastics. Unlike traditional plastic packaging designed to persist in the biosphere for centuries, BC biodegraded within months, significantly reducing its long-term ecological footprint.