Summary
This study demonstrates closed-loop valorisation of bamboo shoot-shell waste into nitrogen-doped carbon dots combined with cellulose and pullulan to produce active food packaging films. The resulting films exhibited mechanical strength comparable to or exceeding conventional biopolymers, broad-spectrum antibacterial activity via a photooxidative pathway, rapid soil biodegradation, and cytocompatibility. When applied to strawberry packaging, the films successfully extended shelf life by reducing microbial growth and maintaining nutritional quality, exemplifying a sustainable agricultural waste-to-packaging strategy.
Regional applicability
This laboratory study was conducted in China and demonstrates waste valorisation methodology potentially applicable to United Kingdom and European food packaging systems. Transferability would depend on local bamboo availability (limited in the UK) and alignment with UK food safety standards (FSA) and packaging regulations; however, the closed-loop approach and rapid biodegradation characteristics align with UK and EU circular economy and sustainable packaging policy objectives.
Key measures
Tensile strength (MPa); barrier properties; UV blocking; antibacterial inhibition (%; E. coli and S. aureus); cytotoxicity (L929 fibroblasts); soil biodegradation (% mass loss, days); strawberry shelf-life metrics (weight loss, microbial growth, acidity, vitamin C, soluble solids)
Outcomes reported
The study developed multifunctional films from upcycled bamboo agro-waste and evaluated their physical properties, antimicrobial efficacy, cytotoxicity, biodegradability, and application to extend strawberry shelf life. Films exhibited tensile strength of ~42 MPa, >96% E. coli inhibition, rapid soil biodegradation (>98% mass loss in 12 days), and extended strawberry freshness.
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