Red blood cell separation means for specific binding assays
First Claim
1. A lateral flow device for determining of the presence, absence, or amount of an analyte in a whole blood sample, which device comprises:
- i) a sample receiving zone comprising a first solid porous matrix with an irreversibly immobilized reagent that specifically binds red blood cell surface antigens and effects the removal of substantially all red blood cells (RBCs) from the whole blood sample to result in a substantially RBC-free fluid containing dissolved or dispersed components, said sample receiving zone being in lateral flow contact withii) a labeling zone comprising a second solid porous matrix with a mobilizable labeling component comprising a visible label coupled to a ligand selected from the group consisting of the analyte, a competitive analog of the analyte and a specific binder partner which specifically binds to the analyte and the analog, said labeling zone being in lateral flow contact withiii) a capture zone comprising a third solid porous matrix with an immobilized capture reagent, said capture zone being in lateral flow contact withiv) an absorbent zone;
wherein said sample receiving zone is separately prepared and positioned contiguous with the remainder of the device prior to application of the sample;
wherein the first, the second and third solid porous matrices are non-bibulous matrices; and
wherein all of said dissolved or dispersed components in said RBC-free fluid flow through the sample receiving zone, labeling zone and capture zone in a non-bibulous flow.
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Accused Products
Abstract
A method and device for detecting the presence, absence or amount of an analyte in a whole blood sample is disclosed. The device comprises four zones, a sample receiving zone, a labeling zone, a capture zone and an absorbent zone. The sample receiving zone contains an irreversibly immobilized reagent that allows for removal of substantially all red blood cells from the whole blood sample. Flow through the device is via capillary migration and all of the dissolved or dispersed components in the sample flow at substantially equal rates and with relatively unimpaired flow through the device. The method involves the use of the device for detection of analyte in a whole blood sample.
140 Citations
11 Claims
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1. A lateral flow device for determining of the presence, absence, or amount of an analyte in a whole blood sample, which device comprises:
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i) a sample receiving zone comprising a first solid porous matrix with an irreversibly immobilized reagent that specifically binds red blood cell surface antigens and effects the removal of substantially all red blood cells (RBCs) from the whole blood sample to result in a substantially RBC-free fluid containing dissolved or dispersed components, said sample receiving zone being in lateral flow contact with ii) a labeling zone comprising a second solid porous matrix with a mobilizable labeling component comprising a visible label coupled to a ligand selected from the group consisting of the analyte, a competitive analog of the analyte and a specific binder partner which specifically binds to the analyte and the analog, said labeling zone being in lateral flow contact with iii) a capture zone comprising a third solid porous matrix with an immobilized capture reagent, said capture zone being in lateral flow contact with iv) an absorbent zone; wherein said sample receiving zone is separately prepared and positioned contiguous with the remainder of the device prior to application of the sample;
wherein the first, the second and third solid porous matrices are non-bibulous matrices; and
wherein all of said dissolved or dispersed components in said RBC-free fluid flow through the sample receiving zone, labeling zone and capture zone in a non-bibulous flow. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification