Abstract
This study reports the synthesis of silver nanoparticles (Ag NPs) by the sodium borohydride reduction method and their embedding in a silica shell functionalized with several antibiotics (ampicillin, penicillin G and isoniazide). The characterization of the novel materials was made by UV–visible absorption spectroscopy, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy, dynamic light scattering and thermal analysis. TEM micrographs revealed the formation of spherical nanoparticles with size ranging between 20 and 50 nm. The Ag NPs embedded in the silica network exhibited a good antimicrobial efficiency, comparable or even superior to that of antibiotic-containing formulations. This is the first report regarding the synergic antimicrobial effect of Ag NPs embedded in silica and ampicillin, both against planktonic cells and biofilms formed by P. aeruginosa and S. aureus, two of the most fearful resistant bugs. These results are demonstrating the great potential of these nanocomposites to be used in developing novel antimicrobial agents or improving the existent ones, by increasing their efficiency, extending their spectrum of activity and decreasing the probability to select resistance, by simultaneously targeting multiple targets in the microbial cells.
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Acknowledgments
Authors would like to thanks the Romanian National Authority for Scientific Research (CNCS–UEFISCDI) for financial support (Grant PN-II-RU-PD-2013-3-0090). Project INFRANANOCHEM-19/01.03.2009 funded by EU (ERDF) and Romanian Government is gratefully acknowledged for the TEM and DLS equipments.
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The authors report no conflicts of interest in this work.
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Tudose, M., Culita, D.C., Munteanu, C. et al. Antibacterial Activity Evaluation of Silver Nanoparticles Entrapped in Silica Matrix Functionalized with Antibiotics. J Inorg Organomet Polym 25, 869–878 (2015). https://doi.org/10.1007/s10904-015-0176-7
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DOI: https://doi.org/10.1007/s10904-015-0176-7