Porous strip form assay device method
First Claim
1. An immunoassay of an aqueous sample for determining an immunoreactive analyte, said process comprising the steps of:
- providing an immunoassay device which comprises (1) an element being formed from a bibulous carrier material having a porous structure through which an aqueous dispersion system is capable of diffusing by capillary action, and (2) a capture component localized at a detection zone in the strip element, said capture component comprising a capturing species capable of specifically binding to a capturable species, said detection zone being spaced from at least one of the ends of the strip element;
forming an aqueous dispersion system containing (a) the aqueous sample to be assayed for said analyte, (b) a first batch of dispersed first particles comprising a first coupling product of a first immunoreactive substance and a detectable label, and (c) a second batch of dispersed second particles comprising a second coupling product of a second immunoreactive substance and the capturable species, said first and said second immunoreactive substances being the same or different and being capable of specifically binding either competitively or non-competitively to said analyte or to one another as a function of the presence or quantity of said analyte in said system to thereby form a dispersed composite reaction product comprising both first and second particles;
causing said aqueous dispersion system to diffuse along said strip element and through the bibulous material thereof and into said detection zone so as to bring the composite reaction product into contact with said capture component to thereby immobilize and concentrate the composite reaction product at the detection zone; and
evaluating the detection zone for the presence of the detectable label as an indicator of the presence or quantity of the immunoreactive analyte in the aqueous sample.
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Accused Products
Abstract
An immunoassay method comprising applying an aqueous solution containing the analyte antigen to one end of a multi-zoned test strip device such that the solution moves along the strip by capillary action. The zones are arranged so that the solution (a) first contacts and reconstitutes dry, diffusible labelled component comprising colloidal gold conjugated to an antibody specific for said analyte antigen and then (b) contacts and reconstitutes dry, diffusible biotinylated second antibody specific for said analyte antigen such that a diffusible, dispersed sandwich reaction product forms. The reaction product diffuses along the strip with the solution and into a zone containing capture component consisting of a latex and avidin complex which avidin collects the reaction product by means of reaction with its biotin moiety. Thus, gold particles are collected and concentrated in the detection zone for visual determination.
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Citations
52 Claims
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1. An immunoassay of an aqueous sample for determining an immunoreactive analyte, said process comprising the steps of:
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providing an immunoassay device which comprises (1) an element being formed from a bibulous carrier material having a porous structure through which an aqueous dispersion system is capable of diffusing by capillary action, and (2) a capture component localized at a detection zone in the strip element, said capture component comprising a capturing species capable of specifically binding to a capturable species, said detection zone being spaced from at least one of the ends of the strip element; forming an aqueous dispersion system containing (a) the aqueous sample to be assayed for said analyte, (b) a first batch of dispersed first particles comprising a first coupling product of a first immunoreactive substance and a detectable label, and (c) a second batch of dispersed second particles comprising a second coupling product of a second immunoreactive substance and the capturable species, said first and said second immunoreactive substances being the same or different and being capable of specifically binding either competitively or non-competitively to said analyte or to one another as a function of the presence or quantity of said analyte in said system to thereby form a dispersed composite reaction product comprising both first and second particles; causing said aqueous dispersion system to diffuse along said strip element and through the bibulous material thereof and into said detection zone so as to bring the composite reaction product into contact with said capture component to thereby immobilize and concentrate the composite reaction product at the detection zone; and evaluating the detection zone for the presence of the detectable label as an indicator of the presence or quantity of the immunoreactive analyte in the aqueous sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A kit of materials for immunoassay of an aqueous sample for determining an immunoreactive analyte, said kit comprising:
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an immunoassay device which comprises (1) an elongated strip element having a pair of opposite ends, said strip element being formed from a bibulous carrier material having a porous structure through which an aqueous dispersion system is capable of diffusing by capillary action, and (2) a capture component localized at a detection zone in the base element, said capture component comprising a capturing species capable of specifically binding to a capturable species, said detection zone being spaced from at least one of the ends of the strip element; a first bath of dry, reconstitutable, water-dispersible first particles comprising a first coupling product of a first immunoreactive substance and a detectable label; and a second batch of dry, reconstitutable, water-dispersible second particles comprising a second coupling product of a second immunoreactive substance and said capturable species, the first and second particles of said first and second batches thereof being dispersible upon coming into contact with said aqueous sample to thereby form an aqueous dispersion system which contains said sample and dispersed first and second particles, said first and second immunoreactive substances being the same or different and being capable of specifically binding either competitively or non-competitively to sad analyte or to one another as a function of the presence or quantity of said analyte in said aqueous dispersion system to thereby form a dispersible composite reaction product comprising both first and second particles, said bibulous carrier material being such that the aqueous dispersion system will diffuse along the strip element and through the bibulous material so as to bring the composite reaction product into contact with the capture component localized at said detection zone to thereby immobilize and concentrate the composite reaction product at the detection zone so that the detection zone may then be evaluated for the presence of the detectable label as an indicator of the presence or quantity of the immunoreactive analyte in the aqueous sample. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification