Facile fabrication of green synthesized silver-decorated magnetic particles for coating of bioactive packaging

Abstract

To avoid bacterial and viral infections on food products, the use of antibacterial and antiviral packaging offers great benefit to the food industry. In this study, the coating of paper packaging with silver-decorated magnetic particles (Ag@Fe 3 O 4 ) was developed. The Ag@Fe 3 O 4 was prepared by a facile and environmentally friendly method using extracted spent coffee grounds (ex-SCG). The effects of Ag@Fe 3 O 4 content on properties of coated paper were investigated. The overall properties of coated paper improved when the Ag@Fe 3 O 4 content increased up to 0.15%w/v. An increase in tensile strength of 154.01% and a decrease in water vapor permeability of 48.50% were found in coated paper with 0.15%w/v Ag@Fe 3 O 4 . Furthermore, the coated paper also exhibited the synergistic effect on antibacterial activities against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). The release of metal ions in food simulants and kinetic release parameters were also studied. The release of silver ions and ferrous ions in food simulants met the requirement of overall migration limit of the European Standard. The paper coated with 0.15%w/v Ag@Fe 3 O 4 had better capabilities to maintain quality and extend shelf-life of tomatoes. The obtained Ag@Fe 3 O 4 coated paper is promising for bioactive food packaging to retain food freshness. Supplementary Information The online version contains supplementary material available at 10.1007/s10570-022-04636-0.

Green-synthesized silver nanoparticle coating on paper for antibacterial and antiviral applications

“…The WVP decreased from 5.84 ± 0.71 × 10 −8 g/m 2 × kPa × h for uncoated paper to 0.17 ± 0.68 × 10 −8 –0.20 ± 0.31 × 10 −8 g/m 2 × kPa × h for coated paper. Srichiangsa et al [ 58 ] suggested that the coating of paper could reduce the number and size of pores on the paper surface, resulting in the poor permeability of the paper package to water vapor. Furthermore, the presence of nanoparticles in coated paper could reduce WVP by the formation of a tortuous path for water vapor transmission.…”

Thermal stability of packaging papers treated of silver water

“…Innovation related to the use of nanotechnology in food packaging and quality control is the focus in the modern food industry. The silver nanoparticles can be relatively uniformly distributed in a matrix of other materials such as pulp, plastics, and others and thus be more effective at killing bacteria and fungi, either in stock preparation proses (Kraśniewska, Galus & Gniewosz, 2020) or as a coating (Gottesman et al, 2011;Srichiangsa et al, 2022;Tsai et al, 2017;Wang et al, 2014). Packaging materials with nanoparticles of silver or coated silver containing coatings allow creating effective and safe antimicrobial packaging.…”