Dissolution of Silver Nanowires and Nanospheres Dictates Their Toxicity to Escherichia coli.
Silver nanoparticles are extensively used in antibacterial applications. However, the mechanisms of their antibacterial action are not yet fully explored. We studied the solubility-driven toxicity of 100 x 6100 nm (mean primary diameter x length) silver nanowires (NWs) to recombinant bioluminescent...
| Publicado en: | BioMed Research International Vol. 2013; pp. 819252 - 819253 |
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| Autores principales: | , , , , , , |
| Formato: | Journal Article |
| Publicado: |
Wiley-Blackwell
2013
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104094558&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104094558 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 23146133 FT2T jtl: BioMed Research International issn: 23146133 maglogo: N pubinfo: dt: 2013 vid: 2013 pid: 480 pub: Wiley-Blackwell place: Malden, Massachusetts artinfo: ui: 104094558 2012259007 NLM24024212 PMC3762159 104094558 ppf: 819252 ppct: 1 formats: fmt: @attributes: type: P tig: atl: Dissolution of Silver Nanowires and Nanospheres Dictates Their Toxicity to Escherichia coli. aug: au: Visnapuu, Meeri Joost, Urmas Juganson, Katre Künnis-Beres, Kai Kahru, Anne Kisand, Vambola Ivask, Angela affil: Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia. sug: subj: Escherichia Coli Drug Effects Equipment and Supplies Nanotechnology Silver Administration and Dosage Antibiotics Administration and Dosage Metals Silver ab: Silver nanoparticles are extensively used in antibacterial applications. However, the mechanisms of their antibacterial action are not yet fully explored. We studied the solubility-driven toxicity of 100 x 6100 nm (mean primary diameter x length) silver nanowires (NWs) to recombinant bioluminescent Escherichia coli as a target representative of enteric pathogens. The bacteria were exposed to silver nanostructures in water to exclude the speciation-driven alterations. Spherical silver nanoparticles (83 nm mean primary size) were used as a control for the effect of NPs shape. Toxicity of both Ag NWs and spheres to E. coli was observed at similar nominal concentrations: the 4h EC50 values, calculated on the basis of inhibition of bacterial bioluminescence, were 0.42 ± 0.06 and 0.68 ± 0.01 mg Ag/L, respectively. Dissolution and bioavailability of Ag from NWs and nanospheres, analyzed with AAS or Ag-sensor bacteria, respectively, suggested that the toxic effects were caused by solubilized Ag+ ions. Moreover, the antibacterial activities of Ag NWs suspension and its ultracentrifuged particle-free supernatant were equal. The latter indicated that the toxic effects of ~80-100 nm Ag nanostructures to Escherichia coli were solely dependent on their dissolution and no shape-induced/related effects were observed. Yet, additional nanospecific effects could come into play in case of smaller nanosilver particles. pubtype: Academic Journal doctype: Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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