System for electrochemical quantitative analysis of analytes within a solid phase

A system suitable for concurrent electrochemical, quantitative determination of multiple analytes in a common test fluid sample, comprising:

• A. at least one test kit reagent comprising a labeled substance that is both specific for interaction with an analyte of interest or mimicking of an analyte of interest within said system, and electrochemically active so as to be capable of electrolytic reduction and oxidation, under analysis conditions;
• B. a solid phase, porous, electrochromatographic medium having a common, linear fluid pathway defined therein, said linear pathway having a delimited area containing at least one immobilized binding material specific for binding to at least one labeled substance or to a complex of a labeled substance and an analyte suspected of being present in said common fluid test sample;
• C. means for combining said test kit reagent(s) and a common fluid test sample suspected of containing one or more analytes of interest within said solid phase, porous electrochromatographic medium, so as to cause said common fluid sample containing said labeled substance(s) and/or a complex of a labeled substance(s) and one or more of said analytes of interest, to flow along said fluid pathway of said medium to said delimited area of said medium and thereby contact said immobilized binding material within said delimited area of said medium, under binding conditions, whereby said labeled substance(s), and/or a complex of a labeled substance(s) and an analyte of interest, is bound by said immobilized binding material within said delimited area of said medium;
• D. electrode means coincident with and in spaced-apart relationship with said delimited area of said medium, said electrode means including at least one working electrode and second electrode selected from the group consisting of a reference electrode and a counter electrode;
• E. means for displacement, under electrolytic conditions, of said label(s) from each of said labeled substance(s), and/or from each of said complex of a labeled substance and analyte(s), bound within said delimited area of said medium, so as to cause said label to form a deposit upon said working electrode of said electrode means;
• F. means for activation of said working electrode, under stripping conditions, so as to effect oxidation of said deposit and thereby produce a current signal response indicative of the concentration of each said analyte(s) of said common test fluid and
• G. means for correlation of said current signal response with a standard or reference.