Physicochemical properties of gelatin/silver nanoparticle antimicrobial composite films

Paulraj Kanmani, Jong Whan Rhim

    Research output: Contribution to journalArticlepeer-review

    179 Citations (Scopus)

    Abstract

    Active nanocomposite films were prepared by blending aqueous solutions of gelatin with different concentrations of silver nanoparticles (AgNPs) using a solvent casting method. Formation of silver nanoparticles in the solution and films was confirmed with the surface plasmon resonance (SPR) band at 400-450 nm, measured by UV-vis absorption spectroscopy. The incorporation of AgNPs slightly affected the physical and mechanical properties of the films. Increase in the concentration of AgNPs resulted in a substantial decrease in water vapour permeability (WVP) and tensile strength (TS) of the gelatin films. Energy dispersive X-ray (EDX) spectroscopy and X-ray diffraction (XRD) analysis confirmed the presence of elemental silver and crystalline structure of the AgNPs in the gelatin film. Microscopic surface structure and thermal properties of the films were also examined by FE-SEM and thermogravimetric analysis. Gelatin/AgNPs nanocomposite films exhibited strong antibacterial activity against food-borne pathogens. Gelatin/AgNPs nanocomposite films are expected to have high potential as an active food packaging system to maintain food safety and to extend the shelf-life of packaged foods.

    Original languageEnglish
    Pages (from-to)162-169
    Number of pages8
    JournalFood Chemistry
    Volume148
    DOIs
    Publication statusPublished - 2014

    Keywords

    • Antibacterial
    • Food packaging
    • Gelatin
    • Nanocomposites
    • Silver nanoparticles

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Food Science

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