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Engineering MechanicallyStrong and Bioactive Gelatin-BasedSupramolecular Plastics via Hydrogen Bonding and Coordination Interactionsfor Food Packaging
Summary
Scientists created a new food packaging material made from gelatin (a natural protein) combined with plant fibers and antioxidant compounds, designed to replace conventional plastics. In tests, this material successfully kept blueberries fresh, resisted water and bacteria, and was strong and flexible—while also being biodegradable, meaning it breaks down naturally instead of contributing to plastic pollution or shedding microplastics into food. This matters because everyday plastic food packaging is a major source of environmental waste and potential microplastic exposure, so a sturdy, plant-based alternative could help protect both the planet and what ends up on
Developing high-performance biopackaging is crucial for mitigating plastic pollution and advancing a sustainable circular economy. Guided by a supramolecular design strategy, this work presented a novel, mechanically strong, and bioactive gelatin-based composite plastic film constructed by sequentially incorporating carboxylated cellulose nanofibers (CCNF), gallic acid (GA), and Al3+, forming a multicross-linked network. The rigid CCNF phase drastically enhanced surface hydrophobicity (water contact angle: 113.9°). GA incorporation achieved near-complete DPPH/ABTS+ free radical scavenging (∼100%), validated by practical blueberry preservation, and increased elongation at break by 384%, indicating a brittle-to-ductile transition. Subsequent Al3+ coordination further strengthened the composite film, yielding a tensile strength of 28.7 MPa and a Young’s modulus of 828 MPa. The final multicross-linked film (GCGAF) exhibited excellent thermal stability, robust gas barrier properties, notable antibacterial activity, and favorable biodegradability. This work provides an effective strategy for fabricating high-performance gelatin-based supramolecular plastics with balanced and superior properties for practical packaging applications.