Preparation of citric acid cross-linked chitosan quaternary phosphonium/polyvinyl alcohol composite film and its application in strawberry preservation

Food Chem. 2024 Oct 15:455:139908. doi: 10.1016/j.foodchem.2024.139908. Epub 2024 May 29.

Abstract

Chitosan quaternary phosphine salts (NPCS) were synthesized with enhanced antimicrobial properties using a two-step method. Composite films (CNSP) were prepared by incorporating NPCS and polyvinyl alcohol (PVA) as the base material, citric acid as the crosslinker and functional additive, exhibiting antibacterial and UV-blocking properties. The composite film showed a maximum tensile strength of 20.4 MPa, an elongation at break of 677%, and a UV light barrier transmittance of 70%. Application of these composite membranes in preserving strawberries demonstrated effectiveness in maintaining freshness by preventing water loss, inhibiting microbial growth, and extending shelf life. In addition, the composite film demonstrated biosafety. These results indicate that CNSP composite films holds significant promise for safe and sustainable food packaging applications.

Keywords: Chitosan quaternary phosphine salt; Citric acid; Film; Polyvinyl alcohol.

Publication types

  • Evaluation Study

MeSH terms

  • Anti-Bacterial Agents / chemistry
  • Anti-Bacterial Agents / pharmacology
  • Chitosan* / chemistry
  • Chitosan* / pharmacology
  • Citric Acid* / chemistry
  • Citric Acid* / pharmacology
  • Cross-Linking Reagents / chemistry
  • Food Packaging* / instrumentation
  • Food Preservation* / instrumentation
  • Food Preservation* / methods
  • Fragaria* / chemistry
  • Polyvinyl Alcohol* / chemistry
  • Tensile Strength

Substances

  • Polyvinyl Alcohol
  • Chitosan
  • Citric Acid
  • Anti-Bacterial Agents
  • Cross-Linking Reagents