Diagnostic test using gated measurement of fluorescence from quantum dots
First Claim
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1. A rapid diagnostic test system comprising:
- a light source for illuminating a medium containing a sample under test, wherein the medium comprises a labeling substance that binds a quantum dot to a target analyte;
a first photodetector positioned to measure light from a test area of the medium; and
a control system coupled to the light source and the photodetector, wherein the control system executes a measurement processes including processing a measurement signal from the photodetector that indicates a light intensity after the light source has been off for a time.
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Abstract
A rapid diagnostic test system or process uses a gated measurement of the fluorescent light from quantum dots after shutting off an illuminating light source. A delay between shutting off the illumination and measuring allows background fluorescence from substances other than the quantum dots to drop significantly when compared to the intensity of the fluorescence from the quantum dots. Using quantum dots permits high measurement repetition rates and good extinction of background fluorescence.
21 Citations
16 Claims
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1. A rapid diagnostic test system comprising:
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a light source for illuminating a medium containing a sample under test, wherein the medium comprises a labeling substance that binds a quantum dot to a target analyte;
a first photodetector positioned to measure light from a test area of the medium; and
a control system coupled to the light source and the photodetector, wherein the control system executes a measurement processes including processing a measurement signal from the photodetector that indicates a light intensity after the light source has been off for a time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 15)
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11. A process for rapid diagnostic testing, comprising:
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applying a sample to a medium containing a labeling substance that binds a quantum dot to a target analyte;
illuminating a portion of the medium with light capable of causing the quantum dot to fluoresce;
stopping illumination of the portion of the medium;
measuring light from the portion of the medium after the illumination remains stopped for a delay time; and
determining a test result from the measuring of the light. - View Dependent Claims (12, 13, 14, 16)
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Specification