Methylene blue as an electrochemical discriminator of single- and double-stranded oligonucleotides immobilised on gold substrates

Tani, Akiko, Thomson, Andrew J. and Butt, Julea ORCID: https://orcid.org/0000-0002-9624-5226 (2001) Methylene blue as an electrochemical discriminator of single- and double-stranded oligonucleotides immobilised on gold substrates. The Analyst, 126 (10). pp. 1756-1759.

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Abstract

Self-assembly of thiol-terminated oligonucleotides on gold substrates provides a convenient and versatile route to DNA-functionalised surfaces. Here we show that the square-wave voltammetric peak position of methylene blue complexed to thiol-terminated single-stranded oligonucleotides immobilised on gold electrodes differs from that of methylene blue complexed to thiol-terminated double-stranded oligonucleotides immobilised on gold electrodes. The peak potential of methylene blue at the single-stranded oligonucleotide array was consistently found to occur at potentials ca. 10–15 mV more positive than that at double-stranded oligonucleotide arrays, the precise difference being dependent on the direction of the voltammetry. This voltammetric behaviour mirrors that found for methylene blue bound to freely diffusing single- and double-stranded calf thymus DNA and suggests that the immobilised oligonucleotides retain the methylene blue binding properties of their freely diffusing counterparts. Thus methylene blue provides a simple electrochemical indicator for the status of oligonucleotide-functionalised gold surfaces.

Item Type:	Article
Faculty \ School:	Faculty of Science > School of Chemistry
Depositing User:	Rachel Smith
Date Deposited:	15 Feb 2011 13:13
Last Modified:	15 Dec 2022 01:45
URI:	https://ueaeprints.uea.ac.uk/id/eprint/21422
DOI:	10.1039/b104260m

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