Patent ID: 8541174

Claim:
An instrument for detection or quantification of an analyte by electrochemiluminescence over a broad range of concentrations, comprising: (a) a support including a plurality of electrodes each comprising a composite containing a matrix and a multiplicity of carbon particles dispersed therein, wherein said plurality of electrodes includes at least two discrete binding domains wherein (i) each of said at least two discrete binding domains comprises one or more binding reagents affixed to said electrode, said binding reagents being capable of binding a component of a binding electrochemiluminescence assay; and (ii) said binding reagents in each of said discrete binding domains recognize said analyte but have different binding affinity for said analyte; (b) a voltage source to supply an electric potential to said plurality of electrodes; (c) one or more light detectors capable of detecting or quantifying light emitted from each of said at least two discrete binding domains on said electrodes; and (d) a microprocessor for detecting or quantifying said analyte based on information received from said one or more light detectors.