Abstract
In the present work it was shown that biosynthesis of silver sulfide nanoparticles from silver nitrate and sodium thiosulfate solutions of millimolar concentration occurs efficiently by living Shewanella oneidensis MR-1 cells, as well as by ultrasonically-disrupted cells and by the membrane fraction of the cells. The size of nanoparticles synthesized in the presence of living cells was 7.8 ± 1.5 nm, while in the presence of ultrasonically-disrupted cells — it was 6.5 ± 2 nm. The shape of nanoparticles in both cases was close to spherical. It was also shown, that synthesis of nanoparticles occurs in a cell-free solution of sodium thiosulfate that has been incubated with cells previously and to which then a silver nitrate solution was added. In this case the nanoparticles were of elongated shape and their size was (11 ± 4) × (24 ± 6) nm. In the control experiment, when only silver nitrate and sodium thiosulfate solutions not incubated with cells were used, the nanoparticles were not detected. It was shown that biosynthesis of nanoparticles occurs both in aerobic and anaerobic conditions. Nanoparticles are not formed by using thermally inactivated cells as it was shown by us previously. The results show the important role of the native structures of cells for the nanoparticles formation.
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Original Russian Text © A.S. Shebanova, T.A. Voeikova, A.V. Egorov, L.M. Novikova, I.N. Krestyanova, L. K. Emelyanova, V.G. Debabov, M.P. Kirpichnikov, K.V. Shaytan, 2014, published in Biofizika, 2014, Vol. 59, No. 3, pp. 500–507.
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Shebanova, A.S., Voeikova, T.A., Egorov, A.V. et al. Study of some aspects of the mechanism of bacterial synthesis of silver sulfide nanoparticles by metal-reducing bacteria Shewanella oneidensis MR-1. BIOPHYSICS 59, 408–414 (2014). https://doi.org/10.1134/S0006350914030221
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DOI: https://doi.org/10.1134/S0006350914030221