Issue 2, 2006
From the journal:

Analyst

Imaging of DNA hybridization on microscopic polypyrrole patterns using scanning electrochemical microscopy (SECM): the HRP bio-catalyzed oxidation of 4-chloro-1-naphthol

Elodie Fortin,b   Pascale Mailley,b   Loic Lacroixa  and  Sabine Szunerits*a  

* Corresponding authors

a Laboratoire d'Electrochimie et de Physicochimie des Matériaux et des Interfaces (LEPMI), CNRS-INPG-UJF, 1130 rue de la piscine, BP 75, 38402 St. Martin d'Hères Cedex, France
E-mail: sabine.szunerits@lepmi.inpg.fr
Fax: +33 4 76 82 66 87
Tel: +33 4 76 82 65 52

b Groupe CREAG, UMR CNRS/CEA/UJF 5819, DRFMC/SI3M, CEA, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France

Abstract

We illustrate in this paper the successful combination of the direct and feedback mode of scanning electrochemical microscopy (SECM) for the writing of oligonucleotide patterns on thin gold films alongside the imaging of DNA hybridization. The patterning process was achieved using the direct mode of SECM, where the electrical field established between the SECM tip and the gold interface was used to drive the local deposition of micrometre sized polypyrrole spots to which a 15mer oligonucleotide (ODN) strand was linked covalently. Imaging of the deposited polypyrrole-ODNs was achieved by means of the feedback mode of SECM using Ru(NH3)63+ as the mediator. The detection of the hybridization reaction of the ODN probes with their biotinylated complementary strands using SECM was possible after subsequent reactions with streptavidin and biotinylated horseradish peroxidase (HRP). The HRP-biocatalyzed oxidation of 4-chloro-1-naphthol (1) in the presence of H2O2, and the precipitation of the insoluble product 4-chloro-1-naphthon (2) on the hybridized areas on the gold film caused a local alteration of conductivity. Such a change in conductivity was sensitively detected by the SECM tip and allowed imaging of DNA arrays in a fast and straightforward way.

Graphical abstract: Imaging of DNA hybridization on microscopic polypyrrole patterns using scanning electrochemical microscopy (SECM): the HRP bio-catalyzed oxidation of 4-chloro-1-naphthol

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Article information

DOI
https://doi.org/10.1039/B504711K
Article type
Paper
Submitted
05 Apr 2005
Accepted
21 Jul 2005
First published
30 Sep 2005

Analyst, 2006,131, 186-193

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Imaging of DNA hybridization on microscopic polypyrrole patterns using scanning electrochemical microscopy (SECM): the HRP bio-catalyzed oxidation of 4-chloro-1-naphthol

E. Fortin, P. Mailley, L. Lacroix and S. Szunerits, Analyst, 2006, 131, 186 DOI: 10.1039/B504711K

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