Chitosan-based aerogel food active packaging with integrated preservation and buffering functions

INTRODUCTION: Berries and vegetables are susceptible to spoilage and deterioration by impact and collision after harvest, and the key to reducing their loss is to develop buffer packaging that integrates impact resistance and preservation. OBJECTIVES: This study aims to prepare chitosan based buffer packaging to resist potential mechanical damage and microbial infection to berries. METHODS: Chitosan-based multifunctional protective aerogel buffer package was prepared using montmorillonite, clove essential oil, and nanocellulose immobilized copper nanoparticles antibacterial fiber (CMC-Cu). RESULTS: The CMC-Cu aerogel buffer packaging had excellent impact resistance and could effectively reduce damage to fruits and vegetables. In addition, the CMC-Cu aerogel buffer packaging could delay the release of antibacterial and antioxidant active agents due to the immobilization of montmorillonite and nanocellulose, endowing the aerogel packaging with a long-lasting preservation effect. The inhibition rate of CMC-Cu buffer packing against Escherichia coli and Staphylococcus aureus was close to 100 %, and it had good antioxidant effect. Furthermore, compared with the control group, the CMC-Cu aerogel packaging could protect blueberries from damage and maintain their quality after simulated transport vibration, extending the storage period by 3 days at 20 °C and 85 % humidity. CONCLUSION: The prepared multifunctional protective aerogel active packaging not only helps reduce loss and improve efficiency in the transportation and storage of berries but also offers a new approach to the development of food active packaging.