In situ synthesis of silver nanoparticles in pectin matrix using gamma irradiation for the preparation of antibacterial pectin/silver nanoparticles composite films. (December 2021)

• Record Type: Journal Article
• Authors: Ardjoum, Nadjat; Shankar, Shiv; Chibani, Nacera; Salmieri, Stephane; Lacroix, Monique
• Is Part Of: Food hydrocolloids. Volume 121(2021)
• Publication Date: 2021-12
• Subjects: Pectin -- Nanocomposite films -- Silver nanoparticles -- Gamma irradiation -- Antibacterial activity; Hydrocolloids -- Periodicals; Food additives -- Periodicals; Colloïdes -- Périodiques; Aliments -- Additifs -- Périodiques; Colloids; Food additives; Periodicals; Electronic journals; 664.06
• DOI: 10.1016/j.foodhyd.2021.107000
• Languages: English
• ISSNs: 0268-005X

Abstract

Abstract: The present study reports in situ synthesis of silver nanoparticles (AgNPs) in pectin matrix using γ-irradiation at 2.5 and 5 kGy and preparation of antibacterial pectin-based nanocomposite films. The FE-SEM micrographs showed that the neat pectin film was smooth but became a little rough after forming AgNPs in the pectin films. The UV–visible spectroscopy analysis exhibited a surface plasmon resonance (SPR) band about 430 nm confirming the formation of AgNPs in the pectin films. The Hunter color values of nanocomposite film changed after the formation of AgNPs. FTIR and thermogravemetric analysis results revealed no structural and thermal stability changes in the pectin films after the synthesis of AgNPs by γ-irradiation. However, mechanical properties and water vapor permeability of the composite films improved after AgNPs synthesis. The pectin-AgNPs nanocomposite films exhibited potent antibacterial activity against Escherichia coli and Salmonella Typhimurium. The developed antibacterial pectin-based nanocomposite films incorporated with AgNPs using γ-irradiation have a potential to increase the shelf life of packaged food. Graphical abstract: Image 1 Highlights: Pectin-silver nanoparticles (AgNPs) films were prepared by solvent casting method. AgNPs in pectin matrix was synthesized using γ-irradiation at 2.5 and 5 kGy. UV–visible spectra showed a peak of AgNPs at around 430 nm. The mechanical and barrier properties of film improved after AgNPs formation. Pectin-AgNPs nanocomposite films exhibited strong antibacterial activity.