Preparation technology and preservation mechanism of novel Ag NPs-loaded ZIF-67 packaging film

Abstract

Pathogenic microorganisms pose a significant threat to postharvest fruits and vegetables, resulting in extensive food waste, economic losses, and potential risks to human health. Developing new and efficient antibacterial preservation materials is of utmost importance. In this study, we used zeolitic imidazolate framework-67 (ZIF-67) as a template to synthesize silver nanoparticles (Ag NPs) in situ, preparing Ag@ZIF-67 composite nanoparticles with broad-spectrum antibacterial properties. Then, carboxymethylcellulose (CMC) incorporated with Ag@ZIF-67 was developed for antibacterial food packaging, resulting in the creation of the Ag@ZIF-67&CMC film. This film exhibited improved physicochemical properties, including enhanced mechanical strength, thermal stability, and gas barrier capabilities. Furthermore, the Ag@ZIF-67&CMC film effectively inhibited the growth of bacteria in a preservation experiment involving peaches. This study confirmed that Ag@ZIF-67 as a highly promising antibacterial nanomaterial, while highlighting the Ag@ZIF-67&CMC film as a potent and promising solution for effective food preservation.