Breakthrough in Food Packaging: Nanofibers Enhance Shelf Life and Safety

Strategic Insights -

Researchers from Jimei University have developed a new composite film for food packaging using sodium alginate, bacterial cellulose nanofibers, and zinc oxide nanoparticles. The innovative film exhibits exceptional mechanical properties, antibacterial activity, and antioxidant capabilities, making it an ideal solution for extending the shelf life of perishable foods. According to the study, the composite film decelerated the weight loss, decay rate, pH, and malondialdehyde change in strawberries, effectively keeping their freshness and delaying their shelf life.

Key Takeaways:

  • The composite film, ZnO-NPs/AP@SA/BCNFs, was prepared using a casting method and exhibited enhanced tensile strength, thermal stability, and water resistance.
  • The incorporation of ZnO-NPs significantly reduced water absorption, water solubility, and water vapor transmittance, while increasing the tensile strength and water degree of freedom.
  • The film demonstrated strong antioxidant activity (DPPH radical scavenging rate 90%) and satisfactory antibacterial activity against E. coli and S. aureus.
  • The soil-buried experiment showed that the ZnO-NPs/AP@SA/BCNFs films had good degradability.
  • The strawberry preservation experiment demonstrated that the composite film efficiently kept the freshness and delayed the shelf life of strawberries.
  • The research highlighted the synergistic antibacterial effect of AP and ZnO-NPs.

Statistics:

  • Tensile strength of the composite film: 25.09 MPa
  • DPPH radical scavenging rate: 90%
  • Inhibition zone against E. coli and S. aureus: 17.29 mm and 16.23 mm, respectively
  • Weight loss of strawberries: decelerated
  • Decay rate, pH, and malondialdehyde change in strawberries: effectively modified

Sources:

  • "Sodium alginate/bacterial cellulose nanofibers films enhanced by ZnO nanoparticles and aqueous phase from hydrothermal carbonization for functional food packaging." International Journal of Biological Macromolecules, 2025;319:145446.
  • International Journal of Biological Macromolecules, Elsevier, Radarweg 29, 1043 Nx Amsterdam, Netherlands.
  • Wenhui Zheng, College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, People's Republic of China.