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<p>This research prepared an antibacterial active packaging material based on carboxymethyl chitosan/polyvinyl alcohol (CMCS/PVA) loaded with cerium dioxide nanoparticles (CeNPs), and evaluated its potential application in fruit preservation. The results of Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and X-ray Diffraction (XRD) indicated that CeNPs were uniformly dispersed in the film matrix, and the components of the film exhibited good compatibility. The composite films containing CeNPs also exhibited excellent mechanical properties. Compared with the CMCS/PVA (CP) film, their tensile strength increased from 15.22&#xa0;MPa to 30.72&#xa0;MPa, and the elongation at break rose from 43.17% to 101.79%. Meanwhile, the incorporation of CeNPs enhanced the barrier properties of the composite films. The composite film with 5% CeNPs exhibited excellent ultraviolet shielding ability, with a transmittance of nearly 0% in the range of 200–315&#xa0;nm, and possessed outstanding gas barrier performance, with the water vapor permeability (WVP) decreased by 35%. In addition, the CP-CeNPs composite film exhibited stronger DPPH and ABTS radical scavenging activities (50.55%, 77.12%), with inhibition rates against <i>Escherichia coli</i> (<i>E. coli</i>) and <i>Staphylococcus aureus</i> (<i>S. aureus</i>) reaching 99.66% and 96.80%, respectively. The composite film showed no toxicity to RAW 264.7 mouse macrophages, with a cell viability of over 80%. Finally, it extended the shelf life of strawberries by 7 d at 25&#xa0;°C. The findings demonstrated that the composite film provided a novel approach for preparing active packaging materials and showed promising potential in fruit preservation packaging applications.</p> Graphical Abstract <p></p>

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Preparation of Multifunctional Carboxymethyl Chitosan/Polyvinyl Alcohol/Cerium Oxide Nanocomposite Films with Enhanced Antibacterial and Antioxidant Properties to Extend Fruit Shelf-Life

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Chenfeng Yu,
  • Yujie Zhang,
  • Tianyuan Liu,
  • Leiqing Pan,
  • Kang Tu

摘要

This research prepared an antibacterial active packaging material based on carboxymethyl chitosan/polyvinyl alcohol (CMCS/PVA) loaded with cerium dioxide nanoparticles (CeNPs), and evaluated its potential application in fruit preservation. The results of Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and X-ray Diffraction (XRD) indicated that CeNPs were uniformly dispersed in the film matrix, and the components of the film exhibited good compatibility. The composite films containing CeNPs also exhibited excellent mechanical properties. Compared with the CMCS/PVA (CP) film, their tensile strength increased from 15.22 MPa to 30.72 MPa, and the elongation at break rose from 43.17% to 101.79%. Meanwhile, the incorporation of CeNPs enhanced the barrier properties of the composite films. The composite film with 5% CeNPs exhibited excellent ultraviolet shielding ability, with a transmittance of nearly 0% in the range of 200–315 nm, and possessed outstanding gas barrier performance, with the water vapor permeability (WVP) decreased by 35%. In addition, the CP-CeNPs composite film exhibited stronger DPPH and ABTS radical scavenging activities (50.55%, 77.12%), with inhibition rates against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) reaching 99.66% and 96.80%, respectively. The composite film showed no toxicity to RAW 264.7 mouse macrophages, with a cell viability of over 80%. Finally, it extended the shelf life of strawberries by 7 d at 25 °C. The findings demonstrated that the composite film provided a novel approach for preparing active packaging materials and showed promising potential in fruit preservation packaging applications.

Graphical Abstract