期刊
NANOMATERIALS
卷 11, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/nano11092306
关键词
silver nanoparticles; plasma activated water; cold plasma; antimicrobial activity; mechanical properties
类别
资金
- Nofima Strategic Programme PackTech
Eco-friendly nanocomposite films based on SA were synthesized for potential food packaging applications, showing superior mechanical properties and antimicrobial activity. The formation of AgNPs and their effects on solution viscosity and shear-thinning behavior were confirmed through various tests, highlighting the potential of these films in food packaging industry.
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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