Microchamber Fluorescence Assay for Trace Analyte Detection
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Solution Overview
Problem
Current methods for detecting trace amounts of analytes in fluid samples are limited by low sensitivity, requiring complex processes and prone to false-positive signals.
Innovation Solution
A method involving a substrate with microchambers coated with specific capture substances, followed by a signal-generating substance, and a hydrophobic solvent to enhance detection, allowing for fluorescence signal counting and calculation of analyte concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If amplification methods are used to increase reporter molecules, then detection sensitivity is improved, but the assay process becomes complicated and false-positive signals may occur
Solution Approach 1:
The invention divides the detection system into spatially separated microchambers, where capture substances are immobilized in specific chambers and analytes are captured locally. This segmentation eliminates the need for complex amplification processes while maintaining high sensitivity through localized concentration effects.
Solution Approach 2:
The invention introduces microchambers as intermediary structures that concentrate analytes through capillary action and surface effects. These microchambers act as mediators between the sample fluid and detection elements, enhancing sensitivity without requiring complex amplification chemistry.
2Measurement precision
If magnetic nanoparticles are used to detect trace analytes, then quantitative analysis capability is improved, but the output signal becomes too low to be measured
Solution Approach 1:
The invention changes the detection parameter from measuring weak magnetic field changes to detecting fluorescence signals. By using fluorescence-generating substances that react with captured analytes, the system transforms the detection mechanism to produce strong, easily measurable optical signals while maintaining quantitative capability.
Solution Approach 2:
The invention replaces the magnetic field-based detection mechanism with a fluorescence-based optical detection system. This substitution eliminates the limitation of weak signal strength while preserving the ability to perform quantitative analysis of trace analytes.
3Productivity
If substrate solution is present outside microchambers, then chemical reactions can occur, but background interference increases and detection accuracy decreases
Solution Approach 1:
The invention applies local quality by creating hydrophilic microchambers in a hydrophobic environment. This local differentiation allows substrate solution to be confined within microchambers where reactions are needed, while preventing background interference outside the chambers. The hydrophobic barrier selectively permits reactions only at designated locations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates easier calculation of analyte concentration in trace amounts by enhancing sensitivity and reducing interference, enabling accurate detection through fluorescence signal counting.
Implementation Method 1
causing a hydrophobic solvent to flow over the substrate to remove the substrate solution present outside the microchambers
Implementation Method 2
causing a substrate solution, which reacts with the signal-generating substance to generate a fluorescence signal
Implementation Method 3
with a first capture substance that specifically binds to the analyte immobilized in the microchambers
Implementation Method 4
causing a second capture substance, which specifically binds to the analyte and binds to a signal-generating substance
Data Source
Figure 1(a)~2
Figure 3(a)~3(e)
Figure 4
AI summary
The present invention includes the steps of: causing a fluid sample containing an analyte to flow over a substrate having an array of microchambers formed on a surface thereof, with a first capture substance that specifically binds to the analyte immobilized in the microchambers; binding the analyte to the first capture substance in each microchamber of the array of microchambers; causing a second capture substance, which specifically binds to the analyte and binds to a signal-generating substance, to flow over the substrate to react the analyte with the second capture substance; causing the signal-generating substance to flow over the substrate to bind to the second capture substance; causing a substrate solution, which reacts with the signal-generating substance to generate a fluorescence signal, to flow over the substrate; causing a hydrophobic solvent to flow over the substrate to remove the substrate solution present outside the microchambers when the signal-generating substance and the substrate solution react in the microchambers; and counting and detecting the number of microchambers in which the fluorescence signal is generated.