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Article: Silver nanoparticles: Partial oxidation and antibacterial activities

TitleSilver nanoparticles: Partial oxidation and antibacterial activities
Authors
KeywordsAntibacterial agents
Oxidation
Silver ions
Silver nanoparticles
Surface plasmon resonance absorption
Issue Date2007
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00775/index.htm
Citation
Journal Of Biological Inorganic Chemistry, 2007, v. 12 n. 4, p. 527-534 How to Cite?
AbstractThe physical and chemical properties of silver nanoparticles that are responsible for their antimicrobial activities have been studied with spherical silver nanoparticles (average diameter approximately 9 nm) synthesized by the borohydride reduction of Ag + ions, in relation to their sensitivity to oxidation, activities towards silver-resistant bacteria, size-dependent activities, and dispersal in electrolytic solutions. Partially (surface) oxidized silver nanoparticles have antibacterial activities, but zero-valent nanoparticles do not. The levels of chemisorbed Ag + that form on the particle's surface, as revealed by changes in the surface plasmon resonance absorption during oxidation and reduction, correlate well with the observed antibacterial activities. Silver nanoparticles, like Ag + in the form of AgNO 3 solution, are tolerated by the bacteria strains resistant to Ag +. The antibacterial activities of silver nanoparticles are related to their size, with the smaller particles having higher activities on the basis of equivalent silver mass content. The silver nanoparticles aggregate in media with a high electrolyte content, resulting in a loss of antibacterial activities. However, complexation with albumin can stabilize the silver nanoparticles against aggregation, leading to a retention of the antibacterial activities. Taken together, the results show that the antibacterial activities of silver nanoparticles are dependent on chemisorbed Ag +, which is readily formed owing to extreme sensitivity to oxygen. The antibacterial activities of silver nanoparticles are dependent on optimally displayed oxidized surfaces, which are present in well-dispersed suspensions. © 2007 SBIC.
Persistent Identifierhttp://hdl.handle.net/10722/69334
ISSN
2015 Impact Factor: 2.495
2015 SCImago Journal Rankings: 0.882
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLok, CNen_HK
dc.contributor.authorHo, CMen_HK
dc.contributor.authorChen, Ren_HK
dc.contributor.authorHe, QYen_HK
dc.contributor.authorYu, WYen_HK
dc.contributor.authorSun, Hen_HK
dc.contributor.authorTam, PKHen_HK
dc.contributor.authorChiu, JFen_HK
dc.contributor.authorChe, CMen_HK
dc.date.accessioned2010-09-06T06:12:42Z-
dc.date.available2010-09-06T06:12:42Z-
dc.date.issued2007en_HK
dc.identifier.citationJournal Of Biological Inorganic Chemistry, 2007, v. 12 n. 4, p. 527-534en_HK
dc.identifier.issn0949-8257en_HK
dc.identifier.urihttp://hdl.handle.net/10722/69334-
dc.description.abstractThe physical and chemical properties of silver nanoparticles that are responsible for their antimicrobial activities have been studied with spherical silver nanoparticles (average diameter approximately 9 nm) synthesized by the borohydride reduction of Ag + ions, in relation to their sensitivity to oxidation, activities towards silver-resistant bacteria, size-dependent activities, and dispersal in electrolytic solutions. Partially (surface) oxidized silver nanoparticles have antibacterial activities, but zero-valent nanoparticles do not. The levels of chemisorbed Ag + that form on the particle's surface, as revealed by changes in the surface plasmon resonance absorption during oxidation and reduction, correlate well with the observed antibacterial activities. Silver nanoparticles, like Ag + in the form of AgNO 3 solution, are tolerated by the bacteria strains resistant to Ag +. The antibacterial activities of silver nanoparticles are related to their size, with the smaller particles having higher activities on the basis of equivalent silver mass content. The silver nanoparticles aggregate in media with a high electrolyte content, resulting in a loss of antibacterial activities. However, complexation with albumin can stabilize the silver nanoparticles against aggregation, leading to a retention of the antibacterial activities. Taken together, the results show that the antibacterial activities of silver nanoparticles are dependent on chemisorbed Ag +, which is readily formed owing to extreme sensitivity to oxygen. The antibacterial activities of silver nanoparticles are dependent on optimally displayed oxidized surfaces, which are present in well-dispersed suspensions. © 2007 SBIC.en_HK
dc.languageengen_HK
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00775/index.htmen_HK
dc.relation.ispartofJournal of Biological Inorganic Chemistryen_HK
dc.subjectAntibacterial agentsen_HK
dc.subjectOxidationen_HK
dc.subjectSilver ionsen_HK
dc.subjectSilver nanoparticlesen_HK
dc.subjectSurface plasmon resonance absorptionen_HK
dc.titleSilver nanoparticles: Partial oxidation and antibacterial activitiesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0949-8257&volume=12&issue=4&spage=527&epage=534&date=2007&atitle=Silver+nanoparticles:+partial+oxidation+and+antibacterial+activitiesen_HK
dc.identifier.emailLok, CN: cnlok@hku.hken_HK
dc.identifier.emailHo, CM: rickyho@hkucc.hku.hken_HK
dc.identifier.emailSun, H: hsun@hku.hken_HK
dc.identifier.emailTam, PKH: paultam@hku.hken_HK
dc.identifier.emailChe, CM: cmche@hku.hken_HK
dc.identifier.authorityLok, CN=rp00752en_HK
dc.identifier.authorityHo, CM=rp00705en_HK
dc.identifier.authoritySun, H=rp00777en_HK
dc.identifier.authorityTam, PKH=rp00060en_HK
dc.identifier.authorityChe, CM=rp00670en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1007/s00775-007-0208-zen_HK
dc.identifier.pmid17353996-
dc.identifier.scopuseid_2-s2.0-34247595454en_HK
dc.identifier.hkuros126889en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34247595454&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume12en_HK
dc.identifier.issue4en_HK
dc.identifier.spage527en_HK
dc.identifier.epage534en_HK
dc.identifier.isiWOS:000246183500008-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridLok, CN=7006410829en_HK
dc.identifier.scopusauthoridHo, CM=12807243800en_HK
dc.identifier.scopusauthoridChen, R=9275915200en_HK
dc.identifier.scopusauthoridHe, QY=34770287900en_HK
dc.identifier.scopusauthoridYu, WY=7403913673en_HK
dc.identifier.scopusauthoridSun, H=7404827446en_HK
dc.identifier.scopusauthoridTam, PKH=7202539421en_HK
dc.identifier.scopusauthoridChiu, JF=7201501692en_HK
dc.identifier.scopusauthoridChe, CM=7102442791en_HK
dc.identifier.citeulike1426698-

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