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Received July 21, 2009
Accepted August 2, 2009
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Antibacterial activity of silver nanoparticles prepared by a chemical reduction method
Department of Chemical and Biochemical Engineering, Konyang University, 26 Naedong, Nonsan, Chungnam 320-711, Korea 1Korea Institute of Energy Research, 71-2 Jangdong, Yuseong-gu, Daejeon 305-343, Korea
bslee@kier.re.kr
Korean Journal of Chemical Engineering, February 2010, 27(2), 688-692(5), 10.1007/s11814-010-0067-0
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Abstract
Silver nanoparticles were obtained by chemical reduction of silver nitrate in water with sodium borohydride (NaBH4) in the presence of SDS (sodium dodecyl sulfate) as a stabilizer. The synthesized silver nanoparticles were characterized by UV-vis spectroscopy (UV-vis) and transmission electron microscopy (TEM). The formation of silver nanoparticles was confirmed from the appearance of surface plasmon absorption maxima at 400 nm by UV-vis. TEM_x000D_
showed the spherical nanoparticles with size in 10-20 nm. The antibacterial activity of silver nanoparticles was tested by using Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coil (E. coli). The silver nanoparticles, whose bacterial activity was dependent on the aggregation degree between particles, exhibited bacterial activity against S. aureus and E. coli.
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