Enhanced antibacterial effect and biodegradation of coating via dual-in-situ growth based on carboxymethyl cellulose

• Published in: Carbohydrate polymers Vol. 302; p. 120433
• Main Authors: Lin, Zhenhao, Fu, Hao, Zhang, Yuancheng, Deng, Yongfu, Wei, Fuxiang, Li, Hao, Xu, Chuanhui, Hua, Fuli, Lin, Baofeng
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 15.02.2023
• Subjects: adhesion; AgNPs; Anti-Bacterial Agents - pharmacology; Antibacterial; antibacterial properties; Biodegradable; biodegradation; Carboxymethyl cellulose; carboxymethylcellulose; Carboxymethylcellulose Sodium - pharmacology; Food Packaging; food safety; food spoilage; Mechanical Phenomena; shelf life; soil; Solubility; thermal stability; water solubility; water vapor; ZIF-8; Carboxymethyl cellulose; AgNPs; Biodegradable; Antibacterial; ZIF-8
• ISSN: 0144-8617; 1879-1344; 1879-1344
• DOI: 10.1016/j.carbpol.2022.120433

The lack of antimicrobial effect of commercial paper coating for food packaging makes it difficult to prevent food spoilage and harms the environment by non-biodegradation. Herein, carboxymethyl cellulose (CMC) provides negatively charged sites for anchoring Ag+ and Zn2+ to grow AgNPs and ZIF-8 in situ on its molecular chains. The ZIF-8/AgNPs@CMC paper coating has excellent synergistic antibacterial activity to prolong the shelf-life of food. It not only has good thermal stability but binds closely to the paper and its adhesion force reaches 628.9 nN. Besides, the ZIF-8/AgNPs@CMC coated paper has better mechanical properties, water vapor barrier, and resists water solubility. Interestingly, due to the confinement effect of ZIF-8, the cumulative release of AgNPs after 168 h is only 2.66 % to avoid possible food safety risks. Especially, the coating can be almost biodegraded in the soil after 30 days, which provides the possibility to replace the non-biodegradable coatings in food packaging. Preparation and application process of the ZIF-8/AgNPs@CMC paper coating. [Display omitted] •Carboxymethyl cellulose provided negatively charged sites to grow ZIF-8 in situ.•Carboxymethyl cellulose successfully reduced AgNPs in situ through its reducibility.•The coating had an excellent antibacterial effect to prolong the shelf-life of food.•The coating was effectively biodegraded to avoid pollution of the environment.