Elektrochemiluminescence onto conducting polymer films for the bio-detection in DNA-chips

Calvo-Munoz Maria luisa Kim Hwanuk Martial Billon 1Bidan Gérard Guillerez Stéphane 

1. CEA-Grenoble, DRFMC/SI3M, UMR 5819 SPrAM, 17 rue des Martyrs, Grenoble 38054, France

Electrochemiluminescence (ECL) is widely used in analytical chemistry and shows several advantages, such as high sensibility and selectivity. ECL is particularly well adapted to the biochip based on the immobilization of DNA probes onto a conducting polymer layer, such as the polypyrrole (Ppy). This bio-sensitive layer was electrogenerated on the electrode surface from pyrrole units and pyrrole monomer bearing DNA. The recognition between the DNA probes onto the Ppy and DNA targets present in an analyte could be achieved by ECL. The principle of this detection method is, as follow. Once the hybridization (DNA probes)/(DNA targets) is completed, the ECL marker was immobilized to the DNA targets thanks to the biotin-avidin interaction, for example. Then, the electrochemical generation of the ECL reaction is induced by polarization of the electrode coated with the DNA functionalized polypyrrole film. ECL combines the advantage of the straightforward monitoring of the electrical addressing with the sensitivity of the luminescence.

Various markers could be used as ABEI (luminol derivative) or Ru(bpy)32+ (bpy=2,2'-bipyridine). In a first step, the results shown in this communication concern the usefulness of the ECL reaction of ABEI in solution generated onto the surface of the electrode coated by a polypyrole film. Our results demonstrated that the potential value to activate the ECL reaction must be in a potentiel range where the polypyrrole matrix is or remains conducting for the time required for the ECL reaction to take place. In a second step, the detection of hybridization DNA probes/DNA targets from ECL of ABEI anchored to DNA targets was studied from a biochip format. The results achieved show that it is possible to discriminate the ECL emission generated from the duplex to this one corresponding to the background signal. In the last part, the ECL of Ru(bpy)32+ was studied onto polymers as polypyrrole and polythiophene showing that this marker could be used for the DNA recognition in a bio-sensitive layer of conducting polymer film as an underlayer.

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: http://science24.com/paper/4824 must be provided.


Presentation: Keynote lecture at SMCBS'2005 Workshop, by Martial Billon
See On-line Journal of SMCBS'2005 Workshop

Submitted: 2005-08-30 06:40
Revised:   2009-06-07 00:44
Web science24.com
© 1998-2021 pielaszek research, all rights reserved Powered by the Conference Engine