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Microbial Synthesis of Noble Metal Nanoparticles using Metal-reducing Bacteria

Published online by Cambridge University Press:  01 February 2011

Yasuhiro Konishi ,
Kaori Ohno ,
Norizoh Saitoh ,
Toshiyuki Nomura  and
Shinsuke Nagamine
Yasuhiro Konishi
Affiliation:
[email protected], Osaka Prefecture University, Dept. of Chemical Engineering, 1-1, Gakuen-cho, Sakai, Osaka, 599-8531, Japan, +81-72-254-9297, +81-72-254-9911
Kaori Ohno
Affiliation:
[email protected], Osaka Prefecture University, Dept. of Chemical Engineering, 1-1, Gakuen-cho, Sakai, Osaka, 599-8531, Japan
Norizoh Saitoh
Affiliation:
[email protected], Osaka Prefecture University, Dept. of Chemical Engineering, 1-1, Gakuen-cho, Sakai, Osaka, 599-8531, Japan
Toshiyuki Nomura
Affiliation:
[email protected], Osaka Prefecture University, Dept. of Chemical Engineering, 1-1, Gakuen-cho, Sakai, Osaka, 599-8531, Japan
Shinsuke Nagamine
Affiliation:
[email protected], Osaka Prefecture University, Dept. of Chemical Engineering, 1-1, Gakuen-cho, Sakai, Osaka, 599-8531, Japan
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Abstract

Microbial synthesis of gold nanoparticles was achieved at 25°C and pH 7-1 using the mesophilic bacterium Shewanella algae with H2 as the electron donor. The microbial synthesis of gold nanoparticle was a fast process: 1 mM AuCl4− ions were completely reduced to insoluble gold within 30 min. At the solution pH 7, the gold nanoparticles of 10-20 nm were synthesized in the periplasmic space of S. algae cells. When the solution pH was decreased to 1, the gold nanoparticles of 50-500 nm were precipitated extracellularly. The solution pH was an important factor in controlling the morphology of biogenic gold particles and location of gold deposition.

Keywords

colloidbiological synthesis (chemical reaction)biomimetic (chemical reaction)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 942: Symposium W – Colloidal Materials – Synthesis, Structure, and Applications , 2006 , 0942-W13-01
Copyright
Copyright © Materials Research Society 2006

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