Ultrasensitive DNA detection using oligonucleotide−silver nanoparticle conjugates

David Thompson, Alexis Enright, Karen Faulds, W. Ewen Smith, Duncan Graham

Research output: Contribution to journalArticlepeer-review

220 Citations (Scopus)


Oligonucleotide−gold nanoparticle (OGN) conjugates are powerful tools for the detection of target DNA sequences due to the unique properties conferred upon the oligonucleotide by the nanoparticle. Practically all the research and applications of these conjugates have used gold nanoparticles to the exclusion of other noble metal nanoparticles. Here we report the synthesis of oligonucleotide−silver nanoparticle (OSN) conjugates and demonstrate their use in a sandwich assay format. The OSN conjugates have practically identical properties to their gold analogues and due to their vastly greater extinction coefficient both visual and absorption analyses can occur at much lower concentrations. This is the first report of OSN conjugates being successfully used for target DNA detection and offers improved sensitivity which is of interest to a range of scientists.
Original languageEnglish
Pages (from-to)2805-2810
Number of pages6
JournalAnalytical Chemistry
Issue number8
Publication statusPublished - 2008
Externally publishedYes


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