Interrupted-flow assay device
First Claim
1. An assay device for detecting at least two analytes in an aqueous sample, a first analyte that is an antigen and a second analyte that is an antibody, the assay device comprising:
- (a) a first opposable component comprising at least one chromatographic medium having (1) a first end comprising a conjugate zone impregnated with a labeled specific binding partner to the first analyte, (2) an intermediate first zone comprising an immobilized specific binding partner to the first analyte, and (3) a second end having a second zone comprising an immobilized antigen which specifically binds to the second analyte;
(b) a second opposable component having an absorber which is brought into fluid communication with an area of the at least one chromatographic medium between the first and second zones thereof when the first and second opposable components are brought into physical contact; and
(c) a labeled specific binding partner to the second analyte impregnated in either the first or the second opposable component in a zone in downstream fluid communication with the second zone;
wherein the first and second opposable components are capable of being brought into physical contact to provide a unidirectional chromatographic specific binding assay for the first analyte and a bidirectional chromatographic specific binding assay for the second analyte by physically contacting the absorber to the first opposable component after migration of an applied aqueous sample from the first end to the second end of the first opposable component in order to reverse fluid flow direction between the first and second ends, and detecting the first and second analytes by detecting formation of labeled ternary complexes in the first and second zones, respectively.
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Abstract
The present invention provides chromatographic assay devices that can perform multiple assays simultaneously in the same test strip, as well as methods for their use. One of the assays can be an immunological assay to detect an antigen, such as human chorionic gonadotropin, while another assay can be a serological assay to detect an antibody, such as anti-rubella antibody. An assay device according to the present invention can comprise: (1) a first opposable component including at least one chromatographic medium having a specific binding partner to the first analyte and a specific binding partner to the second analyte immobilized thereto in separate, discrete, non-overlapping zones; and (2) a second opposable component including an absorber. The first and second opposable components are configured such that bringing the first and second opposable components into opposition causes the absorber to come into operable contact with at least one chromatographic medium so that the zone containing the specific binding partner to the first analyte is functionally divided from the zone containing the specific binding partner to the second analyte so that both analytes can be detected.
255 Citations
25 Claims
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1. An assay device for detecting at least two analytes in an aqueous sample, a first analyte that is an antigen and a second analyte that is an antibody, the assay device comprising:
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(a) a first opposable component comprising at least one chromatographic medium having (1) a first end comprising a conjugate zone impregnated with a labeled specific binding partner to the first analyte, (2) an intermediate first zone comprising an immobilized specific binding partner to the first analyte, and (3) a second end having a second zone comprising an immobilized antigen which specifically binds to the second analyte; (b) a second opposable component having an absorber which is brought into fluid communication with an area of the at least one chromatographic medium between the first and second zones thereof when the first and second opposable components are brought into physical contact; and (c) a labeled specific binding partner to the second analyte impregnated in either the first or the second opposable component in a zone in downstream fluid communication with the second zone; wherein the first and second opposable components are capable of being brought into physical contact to provide a unidirectional chromatographic specific binding assay for the first analyte and a bidirectional chromatographic specific binding assay for the second analyte by physically contacting the absorber to the first opposable component after migration of an applied aqueous sample from the first end to the second end of the first opposable component in order to reverse fluid flow direction between the first and second ends, and detecting the first and second analytes by detecting formation of labeled ternary complexes in the first and second zones, respectively.
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2. An assay device for detecting at least two analytes in an aqueous sample, a first analyte that is an antigen and a second analyte that is an antibody, the assay device comprising:
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(a) a first opposable component comprising at least one chromatographic medium having (1) a first end, (2) an intermediate first zone comprising an immobilized specific binding partner to the first analyte, and (3) a second end having a second zone comprising an immobilized antigen which specifically binds to the second analyte; (b) a second opposable component having (1) a first applicator impregnated with a labeled specific binding partner for the first analyte which is brought into fluid communication with the first zone when the first and second opposable components are brought into physical contact, (2) an absorber which is brought into fluid communication with an area of the at least one chromatographic medium between the first and second zones thereof when the first and second opposable components are brought into physical contact; and
(3) a second applicator impregnated with a labeled specific binding partner for the second analyte which is brought into fluid communication with the second zone, when the first and second opposable components are brought into physical contact;wherein the first and second opposable components are capable of being brought into physical contact to provide a unidirectional chromatographic specific binding assay for the first analyte and a bidirectional chromatographic specific binding assay for the second analyte by physically contacting the absorber to the first opposable component after migration of an applied aqueous sample from the first end to the second end of the first opposable component in order to reverse fluid flow direction between the first and second ends, and detecting the first and second analytes by detecting formation of labeled ternary complexes in the first and second zones, respectively.
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3. An assay device for detecting at least two analytes in an aqueous sample, a first analyte that is an antigen and a second analyte that is an antibody, the assay device comprising:
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(a) a first opposable component comprising at least one chromatographic medium having (1) a first end comprising a first applicator impregnated with a labeled specific binding partner to the first analyte, (2) an intermediate first zone comprising an immobilized specific binding partner to the first analyte, and (3) a second end having a second zone comprising an immobilized antigen which specifically binds to the second analyte; (b) a second opposable component having (1) an absorber which is brought into fluid communication with an area of the at least one chromatographic medium between the first and second zones thereof when the first and second opposable components are brought into physical contact, and (2) a second applicator impregnated with a labeled specific binding partner for the second analyte which is brought into fluid communication with the second zone when the first and second opposable components are brought into physical contact; wherein the first and second opposable components are capable of being brought into physical contact to provide a unidirectional chromatographic specific binding assay for the first analyte and a bidirectional chromatographic specific binding assay for the second analyte by physically contacting the absorber to the first opposable component after migration of an applied aqueous sample from the first end to the second end of the first opposable component in order to reverse fluid flow direction between the first and second ends, and detecting the first and second analytes by detecting formation of labeled ternary complexes in the first and second zones, respectively; and
,wherein the absorber substantially excludes the labeled specific binding partner to the second analyte from the first zone by blocking the labeled specific binding partner to the second analyte from migrating into the first zone.
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4. An assay device for detecting at least two analytes in an aqueous sample, a first analyte that is an antigen and a second analyte that is an antibody, the assay device comprising:
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(a) a first opposable component comprising (i) at least one chromatographic medium having (1) a first end, (2) an intermediate first zone comprising an immobilized specific binding partner to the first analyte, and (3) a second end having a second zone comprising an immobilized antigen which specifically binds to the second analyte, and (ii) a sample preparation zone located between the first zone and the second zone; and
,(b) a second opposable component having (1) a first applicator impregnated with a labeled specific binding partner for the first analyte which is brought into fluid communication with the first zone when the first and second opposable components are brought into physical contact, (2) an absorber which is brought into fluid communication with an area of the at least one chromatographic medium between the first and second zones thereof when the first and second opposable components are brought into physical contact; and
(3) a second applicator impregnated with a labeled specific binding partner for the second analyte which is brought into fluid communication with the second zone, when the first and second opposable components are brought into physical contact;wherein the first and second opposable components are capable of being brought into physical contact to provide a unidirectional chromatographic specific binding assay for the first analyte and a bidirectional chromatographic specific binding assay for the second analyte by physically contacting the absorber to the first opposable component after migration of an applied aqueous sample from the first end to the second end of the first opposable component in order to reverse fluid flow direction between the first and second ends, and detecting the first and second analytes by detecting formation of labeled ternary complexes in the first and second zones, respectively; and
,wherein physical contacting of the absorber divides the first zone from the second zone so that the labeled specific binding partner to the second analyte is substantially excluded from the first zone by blocking the labeled specific binding partner to the second analyte from flowing into the first zone.
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5. An assay device for detecting at least two analytes in an aqueous sample, a first analyte that is an antigen and a second analyte that is an antibody, the assay device comprising:
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(a) a first opposable component comprising (i) at least one chromatographic medium having in order of fluid communication (1) a first end, (2) a first applicator, (3) a conjugate zone impregnated with a labeled specific binding partner to the first analyte bridging the first end and the first applicator, (4) a first zone comprising an immobilized specific binding partner to the first analyte, (5) a second zone comprising an immobilized antigen which specifically binds to the second analyte, (6) a fluid conductor, and (7) a second end; (b) a second opposable component comprising (i) an absorber which is brought into fluid communication with an area of the at least one chromatographic medium between the first and second zones thereof when the first and second opposable components are brought into physical contact; and
(ii) a second applicator impregnated with a labeled specific binding partner for the second analyte which is brought into fluid communication with the fluid conductor, when the first and second opposable components are brought into physical contact;wherein the first and second opposable components are capable of being brought into physical contact to provide a unidirectional chromatographic specific binding assay for the first analyte and a bidirectional chromatographic specific binding assay for the second analyte by physically contacting the absorber to the first opposable component after migration of an applied aqueous sample from the first end to the second end of the first opposable component in order to reverse fluid flow direction between the first and second ends, and detecting the first and second analytes by detecting formation of labeled ternary complexes in the first and second zones, respectively. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. An assay device for detecting at least two analytes in an aqueous sample, a first analyte that is an antigen and a second analyte that is an antibody, the assay device comprising:
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(a) a first opposable component comprising (i) at least one chromatographic medium having in order of fluid communication (1) a first end, (2) a first fluid conductor, (3) a sample preparation zone, (4) a first zone comprising an immobilized specific binding partner to the first analyte, (5) a second zone comprising an immobilized antigen which specifically binds to the second analyte, (6) a second fluid conductor, and (7) a second end; (b) a second opposable component comprising (i) a first applicator impregnated with a resolubilizable labeled specific binding partner for the first analyte which is brought into fluid communication with the first fluid conductor when the first and second opposable components are brought into physical contact, (ii) an absorber which is brought into fluid communication with the sample preparation zone of the at least one chromatographic medium when the first and second opposable components are brought into physical contact, and (iii) a second applicator impregnated with a resolubilizable labeled specific binding partner for the first analyte which is brought into fluid communication with the first fluid conductor, when the first and second opposable components are brought into physical contact; wherein the first and second opposable components are capable of being brought into physical contact to provide a unidirectional chromatographic specific binding assay for the first analyte and a bidirectional chromatographic specific binding assay for the second analyte by physically contacting the absorber to the first opposable component after migration of an applied aqueous sample from the first end to the second end of the first opposable component in order to reverse fluid flow direction between the first and second ends, and detecting the first and second analytes by detecting formation of labeled ternary complexes in the first and second zones, respectively. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An assay device for detecting at least two analytes in an aqueous sample, a first analyte that is an antigen and a second analyte that is an antibody, the assay device comprising:
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(a) a first opposable component comprising (i) a first chromatographic medium having in order of fluid communication (1) a first end, (2) a first fluid conductor, (3) a first zone comprising an immobilized specific binding partner to the first analyte, and (4) a second end; (ii) a second chromatographic medium having in order of fluid communication (1) a first end, (2) a sample preparation zone, (3) a second zone comprising an immobilized antigen which specifically binds to the second analyte, (4) a second fluid conductor, and (5) a second end; (b) a second opposable component comprising (i) a first applicator impregnated with a resolubilizable labeled specific binding partner for the first analyte which is brought into fluid communication with the first fluid conductor when the first and second opposable components are brought into physical contact, (ii) an absorber which is brought into fluid communication with the sample preparation zone of the at least one chromatographic medium when the first and second opposable components are brought into physical contact, and (iii) a second applicator impregnated with a resolubilizable labeled specific binding partner for the first analyte which is brought into fluid communication with the first fluid conductor, when the first and second opposable components are brought into physical contact; wherein the first and second opposable components are capable of being brought into physical contact to provide a unidirectional chromatographic specific binding assay for the first analyte and a bidirectional chromatographic specific binding assay for the second analyte by physically contacting the absorber to the first opposable component after migration of an applied aqueous sample from the first end to the second end of the first opposable component in order to reverse fluid flow direction between the first and second ends, and detecting the first and second analytes by detecting formation of labeled ternary complexes in the first and second zones, respectively. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification