Isis Innovation Limited

Schlumberger Technology Corporation

Oxford University Innovation Ltd

Prad Research and Development Nv

Services Petroliers Schlumberger

Schlumberger Holdings Limited

Schlumberger Oilfield Assistance Limited

Richard Guy Compton

Nathan Scott Lawrence

Li Jiang

Sean P McCormack

Timothy Gareth Jones

Gregory George Wildgoose

Hanpu Liang

Gregory Wildgoose

Debbie S Silvester

Oliver Clinton Mullins

Timothy Gareth John Jones

Andrew Meredith

Patricia Tung Lee

Xuan Dai

Sabine Kuss

Malingappagari Pandurangappa

Craig Edward Banks

Min Lu

Denise Lowinsohn

Lifu Chen

Haiying Yang

Xiuting Li

Christopher Batchelor-Mcauley

Roohollah Torabi Kachoosangi

M Pandurangappa

A method of determining the presence of bacteria expressing cytochrome c oxidase ('the bacteria'), the method comprising: &#x2014;providing a sample suspected of containing the bacteria; &#x2014;providing a compound that has two redox states: a reduced state and an oxidised state, wherein cytochrome c oxidase can convert the compound from its reduced state to its oxidised state; &#x2014;contacting an electrode either with (i) the compound in its oxidised state in the presence of the sample, then applying a reductive potential and measuring the current at the electrode; or (ii) the compound in its reduced state in the presence of the sample, then applying an oxidative potential and measuring the current at the electrode; and&#x2014;comparing the magnitude of the current produced by the reductive potential or oxidative potential in the presence of the sample suspected of containing the bacteria with the magnitude of the current produced under the same conditions, but in the absence of the sample suspected of containing the bacteria, wherein a difference between the magnitude of current produced in the presence of the sample suspected of containing the bacteria and the magnitude of current produced in the absence of the sample suspected of containing the bacteria indicates the presence of the bacteria. Also provided herein is a sensor for determining the presence of bacteria expressing cytochrome c oxidase.

Electrochemical recognition and quantification of cytochrome c oxidase expression in bacteria

A process for determining a content of hydrogen in a fluid medium includes contacting the fluid medium with a sensor. The sensor has a housing enclosing a chamber containing an ionic liquid electrolyte, a window which is permeable to hydrogen and positioned in an opening in the housing, and electrodes in contact with the ionic liquid electrolyte in the chamber. Hydrogen is allowed to pass through the window from the fluid medium into the electrolyte and the sensor is heated. Temperature and pressure of the fluid medium is determined and electrical potential is applied to the electrodes. The method also includes measuring current flow. The sensor can be used to observe hydrogen concentration by voltammetry. The method and sensor may be used for measuring downhole hydrogen content, monitoring fiber-optic cables for damage by hydrogen, corrosion monitoring, and in small-scale process plants where hydrogen is part of a gas stream.

Electrochemical hydrogen sensor

A sensor for hydrogen in a fluid medium has a chamber for electrolyte with a window which is selectively permeable to hydrogen to allow hydrogen to pass from the fluid medium under test into the electrolyte in the chamber. A plurality of electrodes in contact with the ionic liquid electrolyte are used to observe hydrogen concentration by voltammetry. The electrolyte is an ionic liquid. Applications where such a sensor may be used include a wellbore tool for measuring the content of hydrogen in a subterranean fluid, monitoring of fiber-optic cables for damage by hydrogen, corrosion monitoring, and small-scale process plant where hydrogen is part of a gas stream.

Herein is disclosed a method for detecting a material comprising a thiol group (e.g. homocysteine, cysteine, glutathione) in a sample, the method comprising: &#x2022;providing an electrode comprising a carbon material; &#x2022;contacting said electrode with said sample in the presence of catechol or more generally a precursor of ortho-quinone; &#x2022;performing cyclic or square wave voltammetry to convert catechol to ortho-quinone and wherein said ortho-quinone reacts with the material comprising a thiol group to form an electrochemical reaction product.

Electrochemical method and apparatus

An electrode for use in a electrochemical sensor comprises carbon modified with a chemically sensitive redox-active compound, excluding an electrode based on carbon having derivatized thereon two redox-active species wherein at least one of said species is selected from anthraquinone, phenanthrenequinone and N,N'-diphenyl-p-phenylenediamine (DPPD). The invention further provides a pH sensor comprising:

Electrochemical sensors

An electrode for use in a electrochemical sensor comprises carbon modified with a chemically sensitive redox-active compound, excluding an electrode based on carbon having derivatized thereron two redox-active species wherein at least one of said species is selected from anthraquinone, phenanthrenequinone and N,N'-diphenyl-p-phenylenediamine (DPPD). The invention further provides a pH sensor comprising:

According to the present invention, phenols may be detected using an electrochemical sensor comprising a first compound, a working electrode and an electrolyte in contact with the working electrode, wherein the first compound operatively undergoes a redox reaction at the working electrode to form a second compound which operatively reacts in situ with the phenol, wherein said redox reaction has a detectable redox couple and wherein the sensor is adapted to determine the electrochemical response of the working electrode to the consumption of said second compound on reaction with the phenol. The phenol may be, for example, a cannabinoid or a catechin compound.

Detection of phenols

An electrode for use in a electrochemical sensor comprises carbon modified with a chemically sensitive redox-active compound, excluding an electrode based on carbon having derivatised thereron two redox-active species wherein at least one of said species is selected from anthraquinone, phenanthrenequinone and N,N'-diphenyl-p-phenylenediamine (DPPD). The invention further provides a pH sensor comprising:

Electrochemical methods and materials for the detection of arsenic. In one aspect, arsenic is detected using a working electrode comprising particulate platinum. In another aspect, arsenic is detected using an electrode comprising indium tin oxide and particulate gold. Also provided are methods for the production of electrodes which involve the electrodeposition of gold onto indium tin oxide.

Electrochemical detection of arsenic

An electro-chemical sensor is described having two molecular redox systems sensitive to the same species and having an detector to detect relative shifts in the voltammograms of the two redox systems.

Growing community of inventors

Oxford, United Kingdom

Richard Guy Compton