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Gold-nanoparticle-assisted oligonucleotide immobilisation for improved DNA detection

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4 Author(s)
Minard-Basquin, C. ; Stuttgart Technol. Center, Mater. Sci. Lab., Stuttgart, Germany ; Kugler, R. ; Matsuzawa, N.N. ; Yasuda, A.

Colloidal gold nanoparticles are investigated as a potential scaffold for the assisted immobilisation of probe oligonucleotides on silicon surfaces. A preliminary study is devoted to the examination of the immobilisation of DNA-modified gold nanoparticles as a function of time, concentration, salt and pH. The DNA-modified nanoparticles self-assembled onto solid surfaces in a three-dimensional self-assembled architecture. The functionalised surfaces are evaluated in diagnostic assays, where their potential to improve the efficiency of the hybridisation reaction is tested. The system utilising DNA-modified nanoparticles produced an enhancement in the hybridisation efficiency and the sensitivity limit by a factor 10 to 100 as compared to a conventional DNA immobilisation system on a planar surface.

Published in:

Nanobiotechnology, IEE Proceedings -  (Volume:152 ,  Issue: 2 )

Date of Publication:

8 April 2005

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