The University of North Carolina at Chapel Hill

Other

Xanthon, Inc.

North Carolina State University

H Holden Thorp

Mary E Napier

Carson R Loomis

Jinheung Kim

Mark F Sistare

Dean H Johnston

Allen E Eckhardt

John Groelke

David Harris Stewart

Robert S Thomas

Jill C Mikulecky

Royce W Murray

Neena Grover

Anthony M Leone

Ivana V Yang

Mary Elizabeth Williams

Veronika A Szalai

Allyn C Ontko

A method of detecting two different target molecules through a single electrode is carried out by (a) providing a conductive oxidation-reduction reaction detection electrode; (b) contacting a sample suspected of containing a first and second target molecule to the electrode under conditions in which the first and second target molecules are deposited on the electrode, wherein the first target molecule comprises a first label and the second target molecule comprises a second label; (c) contacting to the electrode a first transition metal complex that oxidizes the first preselected label in a first oxidation-reduction reaction and a second transition metal complex that oxidizes the first and second labels in a second oxidation-reduction reaction, with the first and second oxidation-reduction reactions producing different detectable signals; (d) detecting the presence of the first target molecule by detecting the first oxidation-reduction reaction; and (e) detecting the presence of the second target molecule by detecting the second oxidation-reduction reaction. Devices for carrying out the method are also described.

Methods for the electrochemical detection of multiple target compounds

A method of detecting a nucleic acid (e.g., DNA, RNA) that contains at least one preselected base (e.g., adenine, guanine, 6-mercaptoguanine, 8-oxo-guanine, and 8-oxo-adenine) comprises (a) reacting the nucleic acid with a transition metal complex capable of oxidizing the preselected base in an oxidation-reduction reaction; (b) detecting the oxidation-reduction reaction; and (c) determining the presence or absence of the nucleic acid from the detected oxidation-reduction reaction at the preselected base. The method may be used in a variety of applications, including DNA sequencing, diagnostic assays, and quantitative analysis.

Microelectronic device for electrochemical detection of nucleic acid hybridization

Compositions of biomolecules such as nucleic acids that form molten salts are provided. These compositions molten compositions that have useful electrical properties. Such compositions include a salt of (i) an organic polymer ion such as a polynucleic acid anion, and (ii) a polyether or polysiloxane couterion. Methods of making and using such compositions, along with electrical devices such as memory devices, are also provided.

Electrical devices employing molten compositions of biomolecules

An electrode for detecting interactions between members of a binding pair, which electrode has been modified by formation of a non-conductive self-assembled monolayer, and a method of detecting biomolecules, such as nucleic acids or other targets, including receptors, ligands, antigens or antibodies, utilizing such an electrode. When contacted with a target nucleic acid, an oligonucleotide probe coupled to the self-assembled monolayer reacts with the target nucleic acid form a hybridized nucleic acid on the modified electrode surface. The hybridized nucleic acid is reacted with a transition metal complex capable of oxidizing a preselected base in the hybridized nucleic acid in an oxidation-reduction reaction, the oxidation-reduction reaction is detected, and the presence or absence of the nucleic acid is determined from the detected oxidation-reduction reaction.

Monolayer and electrode for detecting a label-bearing target and method of use thereof

Electrochemical detection of nucleic acid hybridization

A method of detecting binding interactions and target molecules, such as proteins, protein fragments, recombinant proteins, recombinant protein fragments, extracellular matrix proteins, ligands, carbohydrates, steroids, hormones, drugs, drug candidates, immunoglobulins and receptors of eukaryotic, prokaryotic or viral origin, by mediated electrochemistry using labels that react with transition metal mediator complexes in a detectable catalytic redox reaction. These labels are attached directly to binders, target molecules, surrogate target molecules, or to affinity ligands capable of binding to the target or to surrogate target molecules capable of competing with the target for binding to another binder. The labels can be naturally present (endogenous) in the binder, target or affinity ligand, or constructed by the covalent attachment of the label to the binder, target, affinity ligand or surrogate target (exogenous).

Detection of binding reactions using labels detected by mediated catalytic electrochemistry

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&lsqb;Ru(vbpy),&rsqb; or poly&lsqb;Ru(vbpy),/vba&rsqb; (vbpy&equals;4-vinyl-4&prime;methyl-2,2&prime;-bipyridine and vba&equals;p-vinylbenzoic acid) and the electrode is used for the electrochemical detection of aqueous GMP, poly&lsqb;G&rsqb;, and surface immobilized single-stranded DNA probes. The film is formed from a co-polymer of a mediator such as Ru(vbpy),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 Ru,couple (present in the polymeric thin film) due to the catalytic oxidation of guanine is observed.

Electropolymerizable film, and method of making and use thereof

Microelectronic device

An electrode for detecting interactions between members of a binding pair, which electrode has been modified by formation of a non-conductive self-assembled monolayer, and a method of detecting biomolecules, such as nucleic acids or other targets, including receptors, ligands, antigens or antibodies, utilizing such an electrode. When contacted with a target nucleic acid, an oligonucleotide probe coupled to the self-assembled monolayer reacts with the target nucleic acid to form a hybridized nucleic acid on the modified electrode surface. The hybridized nucleic acid is reacted with a transition metal complex capable of oxidizing a preselected base in the hybridized nucleic acid in an oxidation-reduction reaction, the oxidation-reduction reaction is detected, and the presence or absence of the nucleic acid is determined from the detected oxidation-reduction reaction.

Monolayer and electrode for detecting a label-bearing target and method

A polymer-electrode including (a) a substrate having a conductive working surface; and (b) a polymer layer on the conductive working surface. The polymer layer has a plurality of microfluidic reaction openings distributed throughout the layer. An oligonucleotide probe can be attached to the polymer layer and is available to capture target nucleic acid. A soluble mediator can diffuse freely and transfer electrons from the preselected base in the hybridized nucleic acid to the conductive working surface of the substrate. An electronic signal generated from the electron transfer reaction is detected and quantitated.

Polymer-electrodes for detecting nucleic acid hybridization and method

A method of cleaving nucleic acids comprises contacting a nucleic acid to an oxoruthenium(IV) coordination complex. Examples of coordination compounds useful for carrying out the method include Ru.sup.IV (tpy)(bpy)O.sup.2+, Ru.sup.IV (typ)(phen)O.sup.2+, Ru.sup.IV (typ)(tmen)O.sup.2+, Ru.sup.IV (bpy).sub.2 (py)O.sup.2+, and Ru.sup.IV (phen).sub.2 (py)O.sup.2+.

Growing community of inventors

Chapel Hill, NC, United States of America

H Holden Thorp