Abstract
Incorporating silver nanoparticles (NPs) into a host material has been recognized to limit the release of Ag+ ions, yet their efficacy in neutralizing nearby microorganisms remains uncertain. This study aims to compare the toxicity of Ag+ ions versus the plasmonic effect of Ag NPs within a glass matrix, assessing their respective killing efficiency and mechanisms against microorganisms. To achieve this objective, a simple ion exchange technique was employed to embed glass with silver ions, nanoclusters (NCs), or NPs, which was confirmed by UV–Vis-NIR spectrometer, photoluminescence (PL), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The biocidal action of these Ag species on model Escherichia coli (E. coli) bacteria was investigated in the absence and presence of visible light. The findings revealed that in the absence of light, plasmonic Ag NPs were less toxic to E. coli compared to Ag+ ions due to the predominant release of Ag+ ions dictating the antibacterial effect. However, exposure to visible light triggered the plasmonic effect in Ag NPs to disintegrate 100% E. coli in 1 h compared to Ag+ ions (68%) owing to the localized heating around the Ag NPs, facilitated by surface plasmon resonance relaxation. The cell morphology investigated by Bio-AFM assisted in unraveling the mechanism leading to bacterial cell damage. Overall, this study demonstrates the sustained disinfection capability of Ag NPs embedded in glass without significant leaching, emphasizing their potential in prolonged antimicrobial applications.
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Acknowledgements
Ranjana Varma thanks WOS-A scheme (SR/WOS-A/PM-5/2017) for providing financial support. The authors are grateful to Prof. D C Kothari, University of Mumbai, India for fruitful discussion and useful suggestions. Nainesh Patel thanks CHRIST University for providing SEED funding (SMSS-2107).
Funding
Department of Science and technology, India, WOS-A scheme (SR/WOS-A/PM-5/2017) for providing financial support.
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NT: performed the experiments and prepared the initial draft of manuscript. RV: analysis of data. KD: performed AFM and analyzed the data. VKM: performed antibacterial test. BMB: writing the manuscript. RP: performed the XPS and analyzed data. NP: supervising the complete work and preparing the final manuscript.
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Thorat, N., Varma, R., Date, K. et al. Ag Ions Versus Ag Nanoparticle-Embedded Glass for Antimicrobial Activity Under Light. Plasmonics (2024). https://doi.org/10.1007/s11468-024-02233-4
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DOI: https://doi.org/10.1007/s11468-024-02233-4