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Published 2021

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Publication details

Journal : Nanomaterials , vol. 11 , p. 1–18 , 2021

Publisher : MDPI

International Standard Numbers :
Printed : 2079-4991
Electronic : 2079-4991

Publication type : Academic article

Contributors : Sharmin, Nusrat; Pang, Chengheng; Sone, Izumi; Walsh, James Leon; Górriz Fernández, Cecilia; Sivertsvik, Morten; Noriega Fernández, Estefanía

Issue : 9

Summary

In this study, sodium alginate (SA)-based, eco-friendly nanocomposites films were synthesized for potential food packaging applications using silver nitrate (AgNO3
) as the metal precursor,
reactive nitrogen and oxygen species (RNOS) created within plasma activated water (PAW), or
through cold plasma treatment (CP) as reducing agent and SA as stabilizing agent. The formation
of silver nanoparticles (AgNPs) was confirmed via the absorption peaks observed between 440
and 450 nm in UV-vis spectroscopy. The tensile strength (TS) and tensile modulus (TM) of the
nanocomposite films were significantly higher than those of the SA films. An increase in the TS was
also observed as the AgNP concentration was increased from 1 to 5 mM. The storage modulus (G') of
the nanocomposite solution was higher than that of the SA solution. The synthesis of AgNPs resulted
both in a higher solution viscosity and a more marked shear-thinning effect. The synthesized AgNPs
showed antimicrobial activity against both Gram-positive (Staphylococcus aureus) and Gram-negative
(Escherichia coli) bacteria. The AgNPs were spherical in shape with an average size of 22 nm.

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