Electropolymerizable film, and method of making and use thereof

C - Chemistry – Metallurgy – 12 – Q

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C12Q 1/68 (2006.01) C12M 1/00 (2006.01) C12N 15/09 (2006.01) G01N 27/30 (2006.01) G01N 27/327 (2006.01) G01N 33/53 (2006.01) G01N 33/566 (2006.01) G01N 27/48 (2006.01)

Patent

CA 2366866

An electrode and method of preparing an electrode by electropolymerizing a film on the conductive working surface of an electrode. The electrode is modified by reductive electropolymerization of a thin film of poly[Ru(vbpy)32+] or poly[Ru(vbpy)32+/vba](vbpy = 4-vinyl-4'methyl-2,2'- bipyridine and vba = p-vinylbenzoic acid) and the electrode is used for the electrochemical detection of aqueous GMP, poly[G], and the surface immobilized single-stranded DNA probes. The film is formed from a co-polymer of a mediator such as Ru(vbpy)32+ and a functionalized moiety having a carboxylate group such as p-vinylbenzoic acid. A DNA probe is attached covalently to the carboxylate group via a carbodiimide reaction followed by amidation of an amino-linked single-stranded DNA. In the presence of these guanine containing moieties, a dramatic enhancement in the oxidative current for the Ru3+/2+ couple (present in the polymeric thin film) due to the catalytic oxidation of guanine is observed.

Electrode et procédé de préparation d'une électrode par électropolymérisation d'une couche mince sur la surface de travail conductive d'une électrode. L'électrode est modifiée par électropolymérisation réductive d'une couche mince de poly[Ru(vbpy)¿3??2+¿] ou de poly[Ru(vbpy)¿3??2+¿/vba](vbpy = 4-vinyl-4'méthyl-2,2'-bipyridine et vba = acide p-vinylbenzoïque) et l'électrode est utilisée pour la détection électrochimique de GMP aqueuse, poly[G], et des sondes d'ADN monocaténaires immobilisées en surface. La couche mince est constituée d'un copolymère d'un médiateur tel que Ru(vbpy)¿3??2+¿ et d'une fraction fonctionnalisée ayant un groupe carboxylate tel que l'acide p-vinylbenzoïque. Une sonde d'ADN est fixée de manière covalente au groupe carboxylate par une réaction de carbodiimide suivie d'une amidation de l'ADN monocaténaire à liaison aminée. En la présence de ces fractions contenant de la guanine, on observe une forte augmentation du courant oxydatif pour le couple Ru?3+/2+¿ (présent dans la couche mince polymère) due à l'oxydation catalytique de guanine.

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