Membrane-based lateral flow assay devices that utilize phosphorescent detection
First Claim
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1. A method for detecting an analyte within a test sample, the method comprising:
- i) providing a lateral flow assay device that comprises a porous membrane in fluid communication with detection probes, the detection probes comprising a phosphorescent particle, the phosphorescent particle comprising a phosphorescent metal complex encapsulated within a barrier matrix comprising polymethylmethacrylate, the detection probes being conjugated with a specific binding member configured to bind with the analyte and form an analyte complex, wherein the porous membrane defines a conjugate pad, the conjugate pad including the detection probes;
a detection zone positioned downstream of the conjugate pad within which is immobilized a capture reagent that is configured to bind to the analyte complex to generate a detection signal; and
a calibration zone positioned downstream of the detection zone within which a capture reagent is immobilized, the capture reagent being capable of binding to uncaptured detection probes to generate a calibration signal;
ii) contacting the lateral flow assay device with the test sample;
iii) subjecting the detection zone to illumination pulses to generate the detection signal;
iv) subjecting the calibration zone to illumination pulses to generate the calibration signal; and
v) thereafter, measuring the intensity of the detection signal and the calibration signal, wherein the amount of the analyte within the test sample is proportional to a ratio of the intensity of the detection signal to the intensity of the calibration signal.
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Abstract
A lateral flow, membrane-based assay device for detecting the presence or quantity of an analyte residing in a test sample is provided. The device utilizes phosphorescence to detect the signals generated by excited phosphorescent labels. The labels may have a long emission lifetime so that background interference from many sources, such as scattered light and autofluorescence, is practically eliminated during detection. In addition, the phosphorescent labels may be encapsulated within particles to shield the labels from quenchers, such as oxygen or water, which might disrupt the phosphorescent signal.
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Citations
19 Claims
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1. A method for detecting an analyte within a test sample, the method comprising:
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i) providing a lateral flow assay device that comprises a porous membrane in fluid communication with detection probes, the detection probes comprising a phosphorescent particle, the phosphorescent particle comprising a phosphorescent metal complex encapsulated within a barrier matrix comprising polymethylmethacrylate, the detection probes being conjugated with a specific binding member configured to bind with the analyte and form an analyte complex, wherein the porous membrane defines a conjugate pad, the conjugate pad including the detection probes;
a detection zone positioned downstream of the conjugate pad within which is immobilized a capture reagent that is configured to bind to the analyte complex to generate a detection signal; and
a calibration zone positioned downstream of the detection zone within which a capture reagent is immobilized, the capture reagent being capable of binding to uncaptured detection probes to generate a calibration signal;ii) contacting the lateral flow assay device with the test sample; iii) subjecting the detection zone to illumination pulses to generate the detection signal; iv) subjecting the calibration zone to illumination pulses to generate the calibration signal; and v) thereafter, measuring the intensity of the detection signal and the calibration signal, wherein the amount of the analyte within the test sample is proportional to a ratio of the intensity of the detection signal to the intensity of the calibration signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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