Membrane-based assay devices
First Claim
1. A membrane-based assay device for detecting the presence or quantity of an analyte residing in a test sample, the device comprising:
- detection probes that comprise non-magnetic particles conjugated with a first specific binding member and labeled with a detectable luminescent substance that is configured to emit a detection signal, the first specific binding member being capable of binding with the analyte;
calibration probes that comprise magnetic particles conjugated with a second specific binding member and labeled with a detectable luminescent substance that is configured to emit a calibration signal that is distinguishable from the detection signal, the second specific binding member being capable of binding with the analyte;
a porous membrane in fluid communication with the detection probes and the calibration probes, wherein the porous membrane defines a detection zone; and
a magnetic device positioned adjacent to the detection zone, the magnetic device being configured to immobilize the calibration probes within the detection zone, the magnetic device further being configured to immobilize within the detection zone complexes formed from the detection probes, the analyte, and the calibration probes.
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Accused Products
Abstract
A membrane-based assay device for detecting the presence or quantity of an analyte residing in a test sample is provided. The device utilizes a self-calibrated magnetic binding assay format (e.g., sandwich, competitive, etc.) that includes detection probes capable of generating a detection signal (e.g., fluorescent non-magnetic particles) and calibration probes capable of generating a calibration signal (e.g., fluorescent magnetic particles). The amount of the analyte within the test sample is proportional (e.g., directly or inversely) to the intensity of the detection signal calibrated by the intensity of the calibration signal. It has been discovered that the fluidics-based device of the present invention provides an accurate, inexpensive, and readily controllable method of determining the presence of an analyte in a test sample.
327 Citations
20 Claims
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1. A membrane-based assay device for detecting the presence or quantity of an analyte residing in a test sample, the device comprising:
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detection probes that comprise non-magnetic particles conjugated with a first specific binding member and labeled with a detectable luminescent substance that is configured to emit a detection signal, the first specific binding member being capable of binding with the analyte; calibration probes that comprise magnetic particles conjugated with a second specific binding member and labeled with a detectable luminescent substance that is configured to emit a calibration signal that is distinguishable from the detection signal, the second specific binding member being capable of binding with the analyte; a porous membrane in fluid communication with the detection probes and the calibration probes, wherein the porous membrane defines a detection zone; and a magnetic device positioned adjacent to the detection zone, the magnetic device being configured to immobilize the calibration probes within the detection zone, the magnetic device further being configured to immobilize within the detection zone complexes formed from the detection probes, the analyte, and the calibration probes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A membrane-based assay device for detecting the presence or quantity of an analyte residing in a test sample, the device comprising:
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detection probes that comprise non-magnetic particles conjugated with a first binding member and labeled with a detectable luminescent substance that is configured to emit a detection signal, the first specific binding member being capable of binding with the analyte; calibration probes that comprise magnetic particles labeled with a detectable luminescent substance that is configured to emit a calibration signal that is distinguishable from the detection signal; non-labeled magnetic particles conjugated with a second binding member, the second binding member also being capable of binding with the analyte; a porous membrane in fluid communication with the detection probes, the calibration probes, and the second magnetic particles, wherein the porous membrane defines a detection zone; and a magnetic device positioned adjacent to the detection zone, the magnetic device being configured to immobilize the calibration probes within the detection zone, the magnetic device further being configured to immobilize within the detection zone complexes formed from the detection probes, the analyte, and the non-labeled magnetic particles. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification