Abstract
In food packaging, developing antimicrobial bionanocomposite coated films with additional function for food safety and shelf life extension is a challenge. Silver nanoparticles are widely used as antimicrobials, but there is few knowledge on the migration of silver nanoparticles from coating to food. In order to minimize Ag migration, we prepared pectin–silver nanoparticles–laponite nanocomposites and coated on oxygen plasma surface-modified polypropylene films, using the roller coating method. Ag migration and antimicrobial activity were studied. The morphology of the coating was investigated by scanning electron microscopy. The dispersion of laponite and silver nanoparticles was analysed by X-ray diffraction. Results show that incorporation of laponite and silver nanoparticles decreased the oxygen transmission rate to 871.43 cc/m2 day atm and decreased the water vapour transmission rate to 4.35 g/m2/day. The coated bionanocomposite exhibited a strong antimicrobial activity against the Escherichia coli and Staphylococcus aureus. Ag migration was below the limit stated by European regulations.
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Vishnuvarthanan, M., Rajeswari, N. Food packaging: pectin–laponite–Ag nanoparticle bionanocomposite coated on polypropylene shows low O2 transmission, low Ag migration and high antimicrobial activity. Environ Chem Lett 17, 439–445 (2019). https://doi.org/10.1007/s10311-018-0770-3
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DOI: https://doi.org/10.1007/s10311-018-0770-3