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Updated: Aug 25, 2025
Bridging the Bio-Electronic Interface with Biofabrication
Published on: June 6, 2012
Gallic acid functionalized chitosan immobilized nanosilver for modified chitosan/Poly (vinyl alcohol) composite film
Yanzhen Zhao1, Liu Yang1, Meirong Xu1
1College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China; Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, PR China.
Abstract:
Food spoilage caused by bacterial growth is a serious threat to human health. Silver nanoparticles (AgNPs) have antibacterial activity against various pathogenic microorganisms, but their rapid release often leads to cumulative toxicity. In this paper, silver nanoparticles (AgNPs@CG) were reduced and immobilized in situ using gallic acid-functionalized chitosan (CG) as a reducing and stabilizing agent to achieve a long-lasting and stable controlled release of Ag+. The AgNPs@CG was incorporated into the CG/PVA composite film. The results showed that the release of Ag+ was only 0.686 ± 0.022 mg·L-1 after seven days, which had a long-lasting antibacterial effect on E. coli and S. aureus. In addition, CG/PVA/AgNPs-2 composite film can significantly improve the freshness preservation effect in fresh-cut apple preservation applications. In conclusion, CG/PVA/AgNPs composite film has potential applications as effective and safe packaging material to extend the shelf life of food products.
