Migratory detection immunoassay
First Claim
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1. A method for determining the presence of an analyte in a sample suspected of containing said analyte, said method employing a strip device capable of providing capillary transport and comprising at least four regions:
- in the direction of eluent migration (1) a reagent region displaced from a first end of said strip device, containing a reagent consisting of a labeled specific binding member diffusibly bound to said strip, (2) a first detection region comprising a bound complementary specific binding member of said labeled specific binding member, said complementary specific binding member being capable of specifically binding (3) a sample region for receiving said sample; and
(4) a second detection region comprising the bound complementary specific binding member of said labeled specific binding member wherein said second detection region nay extend from said reagent region into any reservoir region;
with the proviso that said sample region and said second detection region may overlap, said method employing a signal producing system capable of producing a detectable signal at said second detection region and comprising said labeled specific binding member;
said method comprisingadding said sample to said sample region;
immersing said first end in an eluent to provide a moving liquid phase through said strip, whereby said eluent migrates through said strip carrying said labeled specific binding member and, when sample is outside said detection region, carrying sample into said detection region, and distributing said labeled specific binding member within at least one measurement site in said second detection region in relation to the amount of analyte in said sample, wherein there are at least two spatially separated measurement sites; and
determining the amount of bound labeled specific binding member by means of said signal producing system at said measurement sites as compared to a sample having a known amount of analyte, where the relationship between the amounts at the different sites is compared to the relationship obtained with a sample having a known amount of analyte.
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Abstract
Novel methods and devices are provided for detecting analytes, where the sample is placed upstream from a reagent which is a component of a signal-producing system. The detection zone is provided upstream from the sample, where the amount of reagent which becomes bound at two sites is determined and the two values used for an accurate determination of an analyte.
143 Citations
30 Claims
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1. A method for determining the presence of an analyte in a sample suspected of containing said analyte, said method employing a strip device capable of providing capillary transport and comprising at least four regions:
- in the direction of eluent migration (1) a reagent region displaced from a first end of said strip device, containing a reagent consisting of a labeled specific binding member diffusibly bound to said strip, (2) a first detection region comprising a bound complementary specific binding member of said labeled specific binding member, said complementary specific binding member being capable of specifically binding (3) a sample region for receiving said sample; and
(4) a second detection region comprising the bound complementary specific binding member of said labeled specific binding member wherein said second detection region nay extend from said reagent region into any reservoir region;
with the proviso that said sample region and said second detection region may overlap, said method employing a signal producing system capable of producing a detectable signal at said second detection region and comprising said labeled specific binding member;
said method comprisingadding said sample to said sample region; immersing said first end in an eluent to provide a moving liquid phase through said strip, whereby said eluent migrates through said strip carrying said labeled specific binding member and, when sample is outside said detection region, carrying sample into said detection region, and distributing said labeled specific binding member within at least one measurement site in said second detection region in relation to the amount of analyte in said sample, wherein there are at least two spatially separated measurement sites; and determining the amount of bound labeled specific binding member by means of said signal producing system at said measurement sites as compared to a sample having a known amount of analyte, where the relationship between the amounts at the different sites is compared to the relationship obtained with a sample having a known amount of analyte. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 29)
- in the direction of eluent migration (1) a reagent region displaced from a first end of said strip device, containing a reagent consisting of a labeled specific binding member diffusibly bound to said strip, (2) a first detection region comprising a bound complementary specific binding member of said labeled specific binding member, said complementary specific binding member being capable of specifically binding (3) a sample region for receiving said sample; and
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15. A method for determining the presence of an analyte in a sample suspected of containing said analyte, said method employing a strip device capable of providing capillary transport and comprising a bibulous layer with a least four regions:
- in the direction of eluent migration (1) a reagent region displaced from a first end of said strip device, containing a reagent consisting of an enzyme labeled specific binding member diffusibly bound to said layer, (2) a first detection region comprising the bound complementary specific binding member of said enzyme labeled specific binding member, said complementary specific binding member being capable of specifically binding said analyte, (3) a sample region for receiving said sample; and
(4) a second detection region comprising the bound complementary specific binding member of said enzyme labeled specific binding member;
with the proviso that said sample region and said second detection region may overlap, and an inert support layer overlapping said bibulous layer and providing for access to said first end and at least two detection sites in the second detection region;
said method employing a signal producing system capable of producing a detectable signal at said detection sites and comprising said enzyme labeled specific binding member and enzyme substrate;
said method comprising;adding said sample to said sample region; immersing said first end in an eluent to provide a moving liquid phase through said strip, whereby said eluent migrates through said strip carrying said enzyme labeled specific binding member and, when sample is outside said second detection region, carrying sample into said second detection region, and distributing said enzyme labeled specific binding member through said second detection region in relation to the amount of analyte in said sample; and determining the amount of bound labeled specific binding member by means of said signal producing system at least two spatially separated detection sites, where the relationship between the amounts at the different sites is compared to the relationship obtained with a sample having known amount of analyte. - View Dependent Claims (16, 17, 18, 19, 20, 21)
- in the direction of eluent migration (1) a reagent region displaced from a first end of said strip device, containing a reagent consisting of an enzyme labeled specific binding member diffusibly bound to said layer, (2) a first detection region comprising the bound complementary specific binding member of said enzyme labeled specific binding member, said complementary specific binding member being capable of specifically binding said analyte, (3) a sample region for receiving said sample; and
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22. A strip device capable of providing capillary transport and comprising a bibulous layer comprising at least four regions:
- in the direction of eluent migration (1) a reagent region displaced from a first end of said strip device, containing a reagent consisting of a labeled specific binding member diffusibly bound to said strip wherein said labeled specific binding member is member of a signal producing system;
(2) a first detection region comprising the bound complementary specific binding member of said labeled specific binding member, said complementary specific binding member being capable of specifically binding an analyte;
(3) a sample region for receiving said sample; and
(4) a second detection region comprising the bound complementary specific binding member of said labeled specific binding member;
with the proviso that said sample region may overlap with any detection region, but each detection region must be spatially separated from every other detection region, and an inert support layer overlapping said bibulous layer and providing for access to said first end and said detection sites. - View Dependent Claims (23, 24, 25, 26, 27, 28, 30)
- in the direction of eluent migration (1) a reagent region displaced from a first end of said strip device, containing a reagent consisting of a labeled specific binding member diffusibly bound to said strip wherein said labeled specific binding member is member of a signal producing system;
Specification