Method and device for detecting the presence of analyte in a sample
First Claim
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1. A method for detecting at least one analyte in a liquid sample comprising:
- (a) moving the sample along a pathway comprising three zones located on a single solid phase support, wherein the sample moves from a first zone comprising mobilizeable labeled receptor, which are mobilized by and move with the sample, which receptors specifically bind to and form labeled receptor-analyte complexes with analyte in the presence of analyte in the sample, to a second zone comprising immobilized ligand which binds the mobilized labeled receptors that are not complexed to analye and has a lower association constant than the analyte for the labeled receptor so that the immobilized ligand does not affect the stability of any labeled receptor-analyte complex formed by the moving sample and the labeled receptor and into a third zone for detecting the presence of the labeled receptor-analyte complex; and
(b) detecting the presence of labeled receptor-analyte complexes in the third zone, which positively indicates the presence of analyte in the sample.
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Abstract
An assay provides for detecting the presence of an analyte in a sample. Sample is applied to move through three zones. A mobilizeable receptor capable of binding to the analyte is present in the first zone. A trap for unbound receptor, consisting of immobilized ligand, is present in the second zone. Receptor bound to analyte will not bind to the ligand; unbound receptor will bind to the ligand. Mobilization and migration of the receptor can be detected in the third zone, which positively indicates that analyte is present. A device for carrying out the method is also provided.
214 Citations
11 Claims
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1. A method for detecting at least one analyte in a liquid sample comprising:
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(a) moving the sample along a pathway comprising three zones located on a single solid phase support, wherein the sample moves from a first zone comprising mobilizeable labeled receptor, which are mobilized by and move with the sample, which receptors specifically bind to and form labeled receptor-analyte complexes with analyte in the presence of analyte in the sample, to a second zone comprising immobilized ligand which binds the mobilized labeled receptors that are not complexed to analye and has a lower association constant than the analyte for the labeled receptor so that the immobilized ligand does not affect the stability of any labeled receptor-analyte complex formed by the moving sample and the labeled receptor and into a third zone for detecting the presence of the labeled receptor-analyte complex; and (b) detecting the presence of labeled receptor-analyte complexes in the third zone, which positively indicates the presence of analyte in the sample. - View Dependent Claims (3, 4, 5, 6, 8, 9, 11)
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2. A method for detecting at least one analyte in a liquid sample comprising:
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(a) moving the sample along a pathway comprising three zones located on a single solid phase support, wherein the sample moves from a first zone comprising mobilizeable labeled ligands which are mobilized by and move with the sample, and have a lower association constant than the analyte for a receptor so that the labeled ligands do not affect the stability of any receptor-analyte complexes formed by the moving sample and receptors, to a second zone comprising receptors immobilized therein, which in the absence of analyte bind to mobilized labeled ligands, but in the presence of analyte bind to the analyte so that mobilized labeled ligands do not bind to the receptors and move into a third zone for detecting the presence of labeled ligands; and (b) detecting the presence of labeled ligands in the third zone, which positively indicates the presence of analyte in the sample. - View Dependent Claims (7, 10)
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Specification