Reversible immobilization of assay reagents in a multizone test device
First Claim
1. A multizone test device for the immunoassay determination of an antigen or hapten analyte in a liquid test medium, comprising, in fluid flow contact,(a) a reagent zone comprising a solid, porous matrix and a labeled reagent reversibly immobilized therein by a binding interaction between the labeled reagent and the matrix that is sufficiently disruptable by contact of the matrix with a predetermined component of the test medium other than the analyte to release and thereby render diffusible an analytically effective amount of the labeled reagent independent of the presence or amount of analyte in the liquid test medium, the labeled reagent comprising one of the pair(i) the analyte or a binding analog thereof, and(ii) an antibody which binds the analyte labeled with a detectable chemical group,(b) a reaction zone comprising a solid, porous matrix incorporated with an immobilized form of the other of said pair which interacts with both of the analyte and the labeled reagent to bind and thereby immobilize labeled reagent while leaving an amount of the labeled reagent diffusible as a function of the amount of analyte in the liquid test medium, and(c) a detection zone comprising a solid, porous matrix for receiving labeled reagent which is free to diffuse thereinto from the reaction zone to provide a detectable signal related to the amount of analyte present in the liquid test medium.
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Abstract
A multizone test device for the determination of analyte in a liquid test medium. The test device preferably comprises multilayers including a first layer comprising a solid, porous matrix incorporated with a reversibly immobilized first reagent and a second layer comprising a solid, porous matrix incorporated with a second reagent which interacts with the first reagent and analyte from the liquid test medium to provide a detectable signal. A reversible binding interaction between the first reagent and the matrix of the first layer prevents the first reagent from prematurely migrating into the second layer during manufacture of the device and prior to application of the liquid test medium to the test device. The reversible binding interaction is sufficiently disruptable by contact of the first layer with the liquid test medium to release and thereby render diffusible an analytically effective amount of the first reagent within the test device.
104 Citations
20 Claims
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1. A multizone test device for the immunoassay determination of an antigen or hapten analyte in a liquid test medium, comprising, in fluid flow contact,
(a) a reagent zone comprising a solid, porous matrix and a labeled reagent reversibly immobilized therein by a binding interaction between the labeled reagent and the matrix that is sufficiently disruptable by contact of the matrix with a predetermined component of the test medium other than the analyte to release and thereby render diffusible an analytically effective amount of the labeled reagent independent of the presence or amount of analyte in the liquid test medium, the labeled reagent comprising one of the pair (i) the analyte or a binding analog thereof, and (ii) an antibody which binds the analyte labeled with a detectable chemical group, (b) a reaction zone comprising a solid, porous matrix incorporated with an immobilized form of the other of said pair which interacts with both of the analyte and the labeled reagent to bind and thereby immobilize labeled reagent while leaving an amount of the labeled reagent diffusible as a function of the amount of analyte in the liquid test medium, and (c) a detection zone comprising a solid, porous matrix for receiving labeled reagent which is free to diffuse thereinto from the reaction zone to provide a detectable signal related to the amount of analyte present in the liquid test medium.
Specification