One-step lateral flow nonbibulous assay
First Claim
1. An assay device for detection of the presence or absence of an analyte in a sample, said assay device providing lateral flow contact between three separately prepared zones, said zones comprising:
- (a) a sample receiving zone prepared by lyophilizing a first matrix through which all dissolved or dispersed components in a liquid sample flow at substantially equal rates, said sample receiving zone being in lateral flow contact with(b) a labeling zone prepaired by reversibly coupling a labelwhich label comprises visible moieties coupled either to a specific binding partner reactive with the analyte or to a ligand competitive with analyte for binding to capture reagentto a second matrix in the presence of a methylated BSA blocking agent so that all dissolved or dispersed components in a liquid sample will flow at substantially equal rates through said second matrix, followed by lyophilizing said second matrix said labeling zone being in lateral flow contact with(c) a capture zone prepared by irreversibly coupling a capture reagent which binds to analyte to at least a portion of a third matrix followed by treating said third matrix with a methylated BSA blocking agent so that all dissolved or dispersed components in a liquid sample will flow in substantially equal rates said capture zone being in fluid contact with an absorbent;
wherein the presence or absence of analyte in the sample is detectable in the capture zone within one minute of adding the sample to the sample receiving zone.
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Accused Products
Abstract
A particularly efficient design for a nonbibulous lateral flow one step assay for an analyte in a biological sample is disclosed. In the improved device of the invention, three zones which are in nonbibulous lateral flow contact are employed: a sample receiving zone, a labeling zone, and a capture zone. The sample containing analyte is carried through the labeling zone and interacts with an assay label comprising visible moieties, preferably particles, which are coupled to specific binding reagent for analyte or to a competitor with analyte for a capture reagent. The flow continues into the capture zone where the visible moieties to which analyte or competitor are coupled are captured. Excess fluid is absorbed into an absorbent zone in contact with the capture zone. A positive result is obtained by visualizing the visible moieties in the capture zone. An additional improvement comprises obtaining the nonbibulous lateral flow by converting a bibulous support to a nonbibulous support through coating with a blocking agent, such a methylated BSA. Control label comprising visible moieties (preferably, visually distinguishable from those of the assay label) may also be included in the labeling zone and captured in a separate control portion of the capture zone to verify that the flow of liquid is as expected.
176 Citations
21 Claims
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1. An assay device for detection of the presence or absence of an analyte in a sample, said assay device providing lateral flow contact between three separately prepared zones, said zones comprising:
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(a) a sample receiving zone prepared by lyophilizing a first matrix through which all dissolved or dispersed components in a liquid sample flow at substantially equal rates, said sample receiving zone being in lateral flow contact with (b) a labeling zone prepaired by reversibly coupling a label which label comprises visible moieties coupled either to a specific binding partner reactive with the analyte or to a ligand competitive with analyte for binding to capture reagent to a second matrix in the presence of a methylated BSA blocking agent so that all dissolved or dispersed components in a liquid sample will flow at substantially equal rates through said second matrix, followed by lyophilizing said second matrix said labeling zone being in lateral flow contact with (c) a capture zone prepared by irreversibly coupling a capture reagent which binds to analyte to at least a portion of a third matrix followed by treating said third matrix with a methylated BSA blocking agent so that all dissolved or dispersed components in a liquid sample will flow in substantially equal rates said capture zone being in fluid contact with an absorbent; wherein the presence or absence of analyte in the sample is detectable in the capture zone within one minute of adding the sample to the sample receiving zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification