Preparation of photodynamic-controlled release packaging for pork preservation and its visualization

The current study aimed to synthesize a ZIF-8 metal-organic framework loaded with the Rose Bengal (ZIF-8@RB) as the photodynamic sterilization ingredient to address the uncontrolled release of active ingredients in packaging films. The photodynamic controlled release packaging film was then prepared using a PVDF polymer matrix via uniaxial electrospinning. The microstructure, particle size, excitation wavelength, and singlet oxygen yield of ZIF-8@RB were examined. The results showed that the particle size of ZIF-8@RB was approximately 232.80 nm and a polydispersity index (PDI) of 0.403. The significant reduction in survival rates of E. coli (0.83 %) and S. aureus (0.45 %) following light exposure indicated the antibacterial efficacy. Besides, the photodynamic sterilization condition can be triggered through the color of the homemade pork freshness sensor. Conclusively, the packaging film considerably extended the storage time of pork to 3 days at 4 °C, and the freshness sensor dynamically displayed the preservation process.