Abstract
Bionanocomposite packaging materials have a bright future for a broad range of applications in the food and biomedical industries. Antimicrobial packaging is one of the bionanocomposite packaging materials. Silver nanoparticle (AgNP) is one of the most attractive antimicrobial agents for its broad spectrum of antimicrobial activity against microorganisms. However, the traditional method of preparing AgNPs-functionalized packaging material is cumbersome and not environmentally friendly. To develop an efficient and convenient biosynthesis method to prepare AgNPs-modified bionanocomposite material for packaging applications, we synthesized AgNPs in situ in a silk fibroin solution via the reduction of Ag+ by the tyrosine residue of fibroin, and then prepared AgNPs–silk/poly(vinyl alcohol) (PVA) composite film by blending with PVA. AgNPs were synthesized evenly on the surface or embedded in the interior of silk/PVA film. The prepared AgNPs–silk/PVA film exhibited excellent mechanical performance and stability, as well as good antibacterial activity against both Gram-negative and Gram-positive bacteria. AgNPs–silk/PVA film offers more choices to be potentially applied in the active packaging field.
Highlights
Bionanocomposite packaging materials have a bright future for a broad range of applications in the food and biomedical industries, in addition to innovative active and intelligent food packaging with biofunctional properties
Our studies suggest that the prepared AgNPs–silk/poly(vinyl alcohol) (PVA) film has great potential in active packaging applications
The poor mechanical performance of AgNPs–silk film limits its application in packaging material
Summary
Bionanocomposite packaging materials have a bright future for a broad range of applications in the food and biomedical industries, in addition to innovative active and intelligent food packaging with biofunctional properties. The ever-growing demand for safe and minimally-processed products presents a major challenge for the packaging industry to develop active packaging materials that can maintain the safety and quality of packaged items [2]. To improve the safety and the shelf-life of packaged products, increasing attention has been paid to the design, development and characterization of films, blends, coatings, and nanocomposite formulations with antimicrobial or antioxidant properties [3,4,5,6]. Enzymes, bacteriocins, chelating agents, spice extracts, and essential oils have been directly incorporated into the films to develop antimicrobial packaging [7,8,9,10]. Silver nanoparticle (AgNP) is one of the most attractive antibacterial
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