Chromatographic immunoassay device and method utilizing particle valency for quantification
First Claim
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1. A chromatographic device for determining the presence or amount of analyte in a sample comprising:
- a) a sample receiving site,b) a mobilization zone in liquid communication with and spatially distinct from the sample receiving site,wherein the mobilization zone comprises liquid-mobilizable labelled multivalent receptors,wherein the liquid-mobilizable labelled multivalent receptors have at least one binding site which binds to the analyte in the sample to form receptor;
analyte complexes, andc) at least two separate trap zones downstream of and in liquid communication with the mobilization zone,wherein each trap zone comprises at least one different immobilized ligand which binds to an analyte binding site of the liquid-mobilizable labelled multivalent receptors with an avidity or affinity different than the avidity or affinity of the immobilized ligand to an analyte binding site of the liquid-mobilizable labelled multivalent receptors in the other trap zone,wherein the avidity or affinity of the immobilized ligand increases in each trap zone further downstream of the mobilization zone, andwherein the presence or amount of the analyte in the sample is determined from the distance over which the receptor;
analyte complexes migrate through the trap zones.
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Abstract
A method and device are provided for the semi-quantitative and quantitative determination of an analyte in a sample. A non-competitive trap which can bind unreacted labelled receptor to analyte but has virtually no binding capabilities to receptor in the presence of analyte is used. Labelled receptor:analyte complex is trapped in a second trap. The relative amounts of unbound receptor in the non-competitive trap versus the amount of receptor:analyte complex in the second trap is a measure of the amount of analyte in the sample.
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Citations
26 Claims
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1. A chromatographic device for determining the presence or amount of analyte in a sample comprising:
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a) a sample receiving site, b) a mobilization zone in liquid communication with and spatially distinct from the sample receiving site, wherein the mobilization zone comprises liquid-mobilizable labelled multivalent receptors, wherein the liquid-mobilizable labelled multivalent receptors have at least one binding site which binds to the analyte in the sample to form receptor;
analyte complexes, andc) at least two separate trap zones downstream of and in liquid communication with the mobilization zone, wherein each trap zone comprises at least one different immobilized ligand which binds to an analyte binding site of the liquid-mobilizable labelled multivalent receptors with an avidity or affinity different than the avidity or affinity of the immobilized ligand to an analyte binding site of the liquid-mobilizable labelled multivalent receptors in the other trap zone, wherein the avidity or affinity of the immobilized ligand increases in each trap zone further downstream of the mobilization zone, and wherein the presence or amount of the analyte in the sample is determined from the distance over which the receptor;
analyte complexes migrate through the trap zones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A chromatographic device for detecting an analyte in a sample comprising:
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a) a sample receiving site, b) a mobilization zone downstream of and in liquid communication with the sample receiving site, the mobilization zone comprising liquid-mobilizeable labelled receptors binding to analyte in the sample to form receptor;
analyte complexes, andc) at least one trap zone downstream of and in liquid communication with the mobilization zone wherein at least one trap zone comprises an immobilized ligand which is non-competitive with the analyte bound by the receptor under the conditions used to interact the sample with the immobilized ligands, the association constant of the non-competitive ligand in monomeric form and the receptor being between 103 M-1 and 105 M-1 , whereby when analyte present in the sample forms receptor;
analyte complexes, the non-competitive ligand in the trap does not bind receptor;
analyte complex and the receptor;
analyte complexes migrate through the trap zone, but wherein the non-competitive ligand does bind to the liquid-mobilizable labelled receptor not bound to analyte the liquid-mobilizable labelled receptor does not migrate through the trap zone, andd) a means for correlating the amount of the receptor;
analyte complex or the trapped unbound liquid-mobilizeable labeled receptor or both to the amount of analyte in the sample. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification