DNA biosensor based on the electrochemiluminescence of Ru(bpy)(3)(2+) with DNA-binding intercalators

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This paper reports a novel detection method for DNA hybridization based on the electrochemiluminescence (ECL) of Ru(bpy)(3)(2+) with a DNA-binding intercalator as a reductant of Ru(bpy)(3)(3+). Some ECL-inducible intercalators; have been screened in this study using electrochemical methods combined with a chemiluminescent technique. The double-stranded DNA intercalated by doxorubicin, daunorubicin, or 4 ',6-diamidino-2-phenylindole (DAPI) shows a good ECL with Ru(bpy)(3)(2+) at + 1.19 V (versus Ag/AgCl), while the non-intercalated single-stranded DNA does not. In order to stabilize the self-assembled DNA molecules during ECL reaction, we constructed the ECL DNA biosensor separating the ECL working electrode with an immobilized DNA probe. A gold electrode array on a plastic plate was assembled with a thru-hole array where oligonucleotide probes were immobilized in the side wall of thru-hole array. The fabricated ECL DNA biosensor was used to detect several pathogens using ECL technique. A good specificity of single point mutations for hepatitis disease was obtained by using the DAPI-intercalated Ru (bpy)(3)(2+) ECL. (C) 2006 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2007-05
Language
English
Article Type
Article
Keywords

ELECTROGENERATED CHEMILUMINESCENCE; HYBRIDIZATION; SYSTEM; ABEI; ECL

Citation

BIOELECTROCHEMISTRY, v.70, pp.228 - 234

ISSN
1567-5394
DOI
10.1016/j.bioelechem.2006.09.003
URI
http://hdl.handle.net/10203/90861
Appears in Collection
BiS-Journal Papers(저널논문)
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