Lateral flow system and assay
First Claim
1. A test strip for conducting a lateral flow assay for detection of at least one analyte in a sample, comprising:
- (a) a chromatographic strip comprising a first end and a second end;
(b) at least one capture band, wherein the one capture band is a first capture band, and is located on the chromatographic strip, and wherein the first capture band comprises a first immobilized capture agent for capturing a first analyte in the sample;
(c) optionally, a second capture band that is located on the chromatographic strip, wherein the second capture band comprises a second immobilized capture agent for capturing a second analyte in the sample;
(d) at least one control band optionally comprising an immobilized control agent;
(e) at least one sample filter, wherein the one sample filter is a first sample filter, and wherein the first sample filter is in capillary contact with the chromatographic strip, and optionally comprises an agglutinating agent;
(f) a fluid-impermeable barrier, wherein the barrier is in capillary contact with at least the first sample filter and the chromatographic strip and slows fluid flow from the first sample filter to the chromatographic strip;
(g) at least one mobilizable detectable agent, wherein the one mobilizable detectable agent is a first mobilizable detectable agent that is capable of binding to the first analyte or to a first capture agent or to a complex formed by the combination of the first analyte and the first capture agent, wherein the first mobilizable detectable agent is provided on the chromatographic strip or can be released onto the chromatographic strip;
(h) optionally, a backing that supports the test strip;
(i) a first absorbent pad, that is in capillary contact with the chromatographic strip;
(j) optionally, a second absorbent pad that is in capillary contact with the first absorbent pad;
wherein the test strip allows detection with or without quantitation of an analyte in a sample containing whole cells.
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Accused Products
Abstract
The present invention relates to a lateral flow assay and system, including a test strip, for detection and quantification of analytes in samples, such as samples containing cells and fluid. In general, according to the present invention, a test strip for a lateral flow assay for detection of at least one analyte in a sample comprises: (1) a chromatographic strip, a sample filter, a fluid-impermeable barrier, and means for providing a mobilizable detectable agent that is capable of binding to the at least one analyte or to the capture agent after capturing the analyte to the chromatographic strip such that the mobilizable detectable agent migrates through the chromatographic strip and contacts sample that has passed through the sample filter and also has migrated through the chromatographic strip. The test strip allows detection with or without quantitation of an analyte in a sample containing whole cells.
94 Citations
39 Claims
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1. A test strip for conducting a lateral flow assay for detection of at least one analyte in a sample, comprising:
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(a) a chromatographic strip comprising a first end and a second end; (b) at least one capture band, wherein the one capture band is a first capture band, and is located on the chromatographic strip, and wherein the first capture band comprises a first immobilized capture agent for capturing a first analyte in the sample; (c) optionally, a second capture band that is located on the chromatographic strip, wherein the second capture band comprises a second immobilized capture agent for capturing a second analyte in the sample; (d) at least one control band optionally comprising an immobilized control agent; (e) at least one sample filter, wherein the one sample filter is a first sample filter, and wherein the first sample filter is in capillary contact with the chromatographic strip, and optionally comprises an agglutinating agent; (f) a fluid-impermeable barrier, wherein the barrier is in capillary contact with at least the first sample filter and the chromatographic strip and slows fluid flow from the first sample filter to the chromatographic strip; (g) at least one mobilizable detectable agent, wherein the one mobilizable detectable agent is a first mobilizable detectable agent that is capable of binding to the first analyte or to a first capture agent or to a complex formed by the combination of the first analyte and the first capture agent, wherein the first mobilizable detectable agent is provided on the chromatographic strip or can be released onto the chromatographic strip; (h) optionally, a backing that supports the test strip; (i) a first absorbent pad, that is in capillary contact with the chromatographic strip; (j) optionally, a second absorbent pad that is in capillary contact with the first absorbent pad; wherein the test strip allows detection with or without quantitation of an analyte in a sample containing whole cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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17. A test strip for conducting a lateral flow assay for detection of at least one analyte in a sample, comprising:
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(a) a chromatographic strip comprising a first end and a second end, at least one capture band comprising an immobilized capture agent for capturing the at least one analyte, and at least one control band comprising an immobilized control agent; (b) a conjugate pad, wherein the conjugate pad is in capillary contact with the second end of the chromatographic strip, and wherein the conjugate pad comprises a mobilizable detectable agent that is capable of binding to the at least one analyte or to the capture agent after capturing the analyte; (c) a fluid-impermeable barrier in direct contact with the first end of the chromatographic strip; (d) a sample filter, wherein the sample filter is in capillary contact with the first end of the chromatographic strip and is in direct contact with the fluid-impermeable barrier such that flow from the sample filter in the direction of the first end of the chromatographic strip is substantially delayed, and wherein the sample filter optionally comprises an agglutinating agent; (e) optionally, a buffer pad that is located at the second end of the chromatographic strip and is in direct contact with the conjugate pad; (f) a first absorbent pad located at the first end of the chromatographic strip that is in direct contact with the chromatographic strip; and (g) optionally, a second absorbent pad that is in direct contact with the first absorbent pad; wherein the test strip allows detection with or without quantitation of an analyte in a sample containing whole cells.
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18. A test strip for conducting a lateral flow assay for detection of at least one analyte in a sample, comprising:
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(a) a chromatographic strip comprising a first end and a second end, at least one capture band comprising an immobilized capture agent for capturing the at least one analyte, and at least one control band comprising an immobilized control agent; (b) a conjugate pad, wherein the conjugate pad is in direct capillary contact with the second end of the chromatographic strip, and wherein the conjugate pad comprises a mobilizable detectable agent that is capable of binding to the at least one analyte or to the capture agent after capturing the analyte; (c) first and second sample filters, wherein each of the first and second sample filters optionally comprises an agglutinating agent, and each of the first and second sample filters is in capillary contact with the chromatographic strip, the first sample filter being located at, or near, the first end of the chromatographic strip and the second sample filter being located adjacent to the second end of the chromatographic strip; (d) a fluid collector that is located between the second sample filter and the conjugate pad such that it is in direct contact with both the second sample filter and the conjugate pad; (e) a fluid-impermeable barrier in direct contact with the first sample filter and the chromatographic strip at, or near, the first end such that flow from the first sample filter in the direction of the first end of the chromatographic strip is substantially delayed; (f) a first absorbent pad located at the first end of the chromatographic strip that is in direct contact with the chromatographic strip, the first absorbent pad being located closer to the first end of the chromatographic strip than the first sample filter; and (g) optionally, a second absorbent pad that is in direct contact with the first absorbent pad; wherein the test strip allows detection with or without quantitation of an analyte in a sample containing whole cells.
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19. A test strip for conducting a lateral flow assay for detection of at least one analyte in a sample, comprising:
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(a) a chromatographic strip comprising a first end and a second end, at least one capture band comprising an immobilized capture agent for capturing the at least one analyte, and at least one control band comprising an immobilized control agent; (b) first and second sample filters, wherein each of the first and second sample filters optionally comprises an agglutinating agent, and each of the first and second sample filters is in capillary contact with the chromatographic strip, the first sample filter being located at, or near, the first end of the chromatographic strip and the second sample filter being located adjacent to the second end of the chromatographic strip; (c) a fluid collector that is located between the second sample filter and the chromatographic strip such that it is in direct contact with both the second sample filter and the chromatographic strip; (d) a conjugate pad located at the second end of the chromatographic strip and that is in direct contact with the second sample filter and indirect contact with the fluid collector, and wherein the conjugate pad comprises a mobilizable detectable agent that is capable of binding to the at least one analyte or to the capture agent after capturing the analyte; (e) a fluid-impermeable barrier in direct contact with the first sample filter and the chromatographic strip at, or near, the first end such that flow from the first sample filter in the direction of the first end of the chromatographic strip is substantially delayed; (f) a first absorbent pad located at the first end of the chromatographic strip that is in direct contact with the chromatographic strip, the first absorbent pad being located closer to the first end of the chromatographic strip than the first sample filter; and (g) optionally, a second absorbent pad that is in direct contact with the first absorbent pad; wherein the test strip allows detection with or without quantitation of an analyte in a sample containing whole cells. - View Dependent Claims (20)
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Specification