Journal
NANOTOXICOLOGY
Volume 5, Issue 2, Pages 244-253Publisher
TAYLOR & FRANCIS LTD
DOI: 10.3109/17435390.2010.525669
Keywords
Silver; nanoparticles; nanotechnology; nanotoxicity; microbiology
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Funding
- United States Air Force Office of Scientific Research (USAFOSR) [FA 9950-08-1-0182]
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Silver nanoparticles (Ag-nps) are used as a natural biocide to prevent undesired bacterial growth in clothing and cosmetics. The objective of this study was to assess the antibacterial efficacy of Ag-nps of different sizes, surface conditions, and synthesis methods against Escherichia coli, Ag-resistant E. coli, Staphylococcus aureus, methicillin-resistant S. aureus (MRSA), and Salmonella sp. Ag-nps samples were synthesized by: Base reduction with unmodified surfaces and used as synthesized (''unwashed''; 20, 50 and 80 nm) or after 20 phosphate buffer washes (''washed''; 20, 50 and 80 nm), or synthesized by laser ablation with carbon-stabilized surfaces (''carbon-coated''; 25 and 35 nm). Unwashed Ag-nps were toxic to all bacterial strains at concentrations between 3.0--8.0 mu mu g/ml. The washed Ag-nps and carbon-coated Ag-nps were toxic to all bacterial strains except Ag-resistant E. coli at concentrations between 64.0--1024.0 mu mu g/ml. Ag-resistant E. coli died only when treated with unwashed Ag-nps or its supernatant, both of which contained formaldehyde.
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