Methods of assay

Details Methods of assay Methods of assay

G - Physics

01

N

324/23, 324/27

G01N 33/53 (2006.01) G01N 27/48 (2006.01) G01N 33/543 (2006.01)

Patent

CA 1268520

Abstract 'Methods of Assay' In its broadest aspect, the present invention provides a method of assaying a ligand in a sample using electrochemical apparatus containing an electrode and components comprising: (a) the sample, (b) a specific binding partner to the ligand, (c) if desired, at least one further reagent selected from ligand analogues (as herein defined) and specific binding partners, and (d) an electron-source or electron-acceptor; at least one of components (b) and, if present, (c) being labelled with an electron-transfer mediator capable of aiding the transfer of electrons from the electron-source to the electrode, or from the electrode to the electron- acceptor, which method includes the step of determining whether, and, if desired, the extent to which, the said transfer of electrons is perturbed by complex formation and/or by controlled external influences. The electrochemical apparatus will typically comprise two or three electrodes, including one working electrode onto which one or more of the components may advantageously be immobilised. An artificial generation or enhancement of perturbation of electron transfer is preferably performed by displacement of the complex formed relative to the unbound labelled component.

481357

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