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Nanosilver on nanostructured silica: Antibacterial activity and Ag surface area

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Title: Nanosilver on nanostructured silica: Antibacterial activity and Ag surface area
Authors: Sotiriou, Georgios A.1, Teleki, Alexandra1, Camenzind, Adrian1, Krumeich, Frank1, Meyer, Andreas2, Panke, Sven2, Pratsinis, Sotiris E.1 sotiris.pratsinis@ptl.mavt.ethz.ch
Source: Chemical Engineering Journal. Jun2011, Vol. 170 Issue 2/3, p547-554. 8p.
Subjects: Colloidal silver, Silica, Nanostructured materials, Antibacterial agents, Surface area, Green fluorescent protein, Escherichia coli, Particle size distribution, Solution (Chemistry), Acetonitrile
Abstract: Abstract: Nanosilver is one of the first nanomaterials to be closely monitored by regulatory agencies worldwide motivating research to better understand the relationship between Ag characteristics and antibacterial activity. Nanosilver immobilized on nanostructured silica facilitates such investigations as the SiO2 support hinders the growth of nanosilver during its synthesis and, most importantly, its flocculation in bacterial suspensions. Here, such composite Ag/silica nanoparticles were made by flame spray pyrolysis of appropriate solutions of Ag-acetate or Ag-nitrate and hexamethyldisiloxane or tetraethylorthosilicate in ethanol, propanol, diethylene glucolmonobutyl ether, acetonitrile or ethylhexanoic acid. The effect of solution composition on nanosilver characteristics and antibacterial activity against the Gram negative Escherichia coli was investigated by monitoring their recombinantly synthesized green fluorescent protein. Suspensions with identical Ag mass concentration exhibited drastically different antibacterial activity pointing out that the nanosilver surface area concentration rather than its mass or molar or number concentration determine best its antibacterial activity. Nanosilver made from Ag-acetate showed a unimodal size distribution, while that made from inexpensive Ag-nitrate exhibited a bimodal one. Regardless of precursor composition or nanosilver size distribution, the antibacterial activity of nanosilver was correlated best with its surface area concentration in solution. [Copyright &y& Elsevier]
Copyright of Chemical Engineering Journal is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 60928295
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Nanosilver on nanostructured silica: Antibacterial activity and Ag surface area
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  Data: <searchLink fieldCode="DE" term="%22Colloidal+silver%22">Colloidal silver</searchLink><br /><searchLink fieldCode="DE" term="%22Silica%22">Silica</searchLink><br /><searchLink fieldCode="DE" term="%22Nanostructured+materials%22">Nanostructured materials</searchLink><br /><searchLink fieldCode="DE" term="%22Antibacterial+agents%22">Antibacterial agents</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+area%22">Surface area</searchLink><br /><searchLink fieldCode="DE" term="%22Green+fluorescent+protein%22">Green fluorescent protein</searchLink><br /><searchLink fieldCode="DE" term="%22Escherichia+coli%22">Escherichia coli</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+size+distribution%22">Particle size distribution</searchLink><br /><searchLink fieldCode="DE" term="%22Solution+%28Chemistry%29%22">Solution (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Acetonitrile%22">Acetonitrile</searchLink>
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  Data: Abstract: Nanosilver is one of the first nanomaterials to be closely monitored by regulatory agencies worldwide motivating research to better understand the relationship between Ag characteristics and antibacterial activity. Nanosilver immobilized on nanostructured silica facilitates such investigations as the SiO2 support hinders the growth of nanosilver during its synthesis and, most importantly, its flocculation in bacterial suspensions. Here, such composite Ag/silica nanoparticles were made by flame spray pyrolysis of appropriate solutions of Ag-acetate or Ag-nitrate and hexamethyldisiloxane or tetraethylorthosilicate in ethanol, propanol, diethylene glucolmonobutyl ether, acetonitrile or ethylhexanoic acid. The effect of solution composition on nanosilver characteristics and antibacterial activity against the Gram negative Escherichia coli was investigated by monitoring their recombinantly synthesized green fluorescent protein. Suspensions with identical Ag mass concentration exhibited drastically different antibacterial activity pointing out that the nanosilver surface area concentration rather than its mass or molar or number concentration determine best its antibacterial activity. Nanosilver made from Ag-acetate showed a unimodal size distribution, while that made from inexpensive Ag-nitrate exhibited a bimodal one. Regardless of precursor composition or nanosilver size distribution, the antibacterial activity of nanosilver was correlated best with its surface area concentration in solution. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Chemical Engineering Journal is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.cej.2011.01.099
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        Text: English
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        PageCount: 8
        StartPage: 547
    Subjects:
      – SubjectFull: Colloidal silver
        Type: general
      – SubjectFull: Silica
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      – SubjectFull: Nanostructured materials
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      – SubjectFull: Antibacterial agents
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      – SubjectFull: Surface area
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      – SubjectFull: Green fluorescent protein
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      – SubjectFull: Escherichia coli
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      – SubjectFull: Particle size distribution
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      – SubjectFull: Solution (Chemistry)
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      – SubjectFull: Acetonitrile
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      – TitleFull: Nanosilver on nanostructured silica: Antibacterial activity and Ag surface area
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              Text: Jun2011
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              Y: 2011
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