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Applied and Environmental Microbiology, November 2008, p. 7090-7093, Vol. 74, No. 22
0099-2240/08/$08.00+0     doi:10.1128/AEM.01069-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Formation of Nanoscale Elemental Silver Particles via Enzymatic Reduction by Geobacter sulfurreducens{triangledown}

Nicholas Law,1 Saadia Ansari,1 Francis R. Livens,1,2 Joanna C. Renshaw,3 and Jonathan R. Lloyd1*

School of Earth, Atmospheric, and Environmental Sciences and Williamson Research Centre for Molecular Environmental Science, The University of Manchester, Manchester M13 9PL, United Kingdom,1 Centre for Radiochemistry Research, School of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom,2 School of Geography, Earth, and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom3

Received 13 May 2008/ Accepted 14 August 2008

Geobacter sulfurreducens reduced Ag(I) (as insoluble AgCl or Ag+ ions), via a mechanism involving c-type cytochromes, precipitating extracellular nanoscale Ag(0). These results extend the range of metals known to be reduced by Geobacter species and offer a method for recovering silver from contaminated water as potentially useful silver nanoparticles.

* Corresponding author. Mailing address: School of Earth, Atmospheric, and Environmental Sciences, The University of Manchester, Manchester M13 9PL, United Kingdom. Phone: 44 (0) 161 275 7155. Fax: 44 (0) 161 275 3947. E-mail: jon.lloyd{at}manchester.ac.uk

{triangledown} Published ahead of print on 22 August 2008.

Applied and Environmental Microbiology, November 2008, p. 7090-7093, Vol. 74, No. 22
0099-2240/08/$08.00+0     doi:10.1128/AEM.01069-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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