Lateral Flow Assay Enzymatic Amplification for Low-Abundance Detection
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Solution Overview
Problem
Current molecular diagnostics methods for detecting low-concentration biological and chemical targets in samples are hindered by background interference and the need for amplification, which requires complex and costly instruments, making them unsuitable for resource-limited environments and point-of-care applications.
Innovation Solution
A lateral flow assay device with a chromatographic medium that includes a sample loading zone, a reporting carrier zone with proficient enzymes, and a detection zone, allowing for direct detection of analytes without amplification, using enzymes like urease and phosphocholine phosphatase to generate detectable products from substrates, enabling rapid and cost-effective analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If amplification methods like PCR are used to detect low-abundance nucleic acid targets, then the limit of detection is improved, but the device complexity and cost increase significantly
Solution Approach 1:
The invention extracts and utilizes endogenous enzymatic amplification capabilities that already exist within the biological sample itself, rather than introducing external complex amplification instruments. By detecting the natural enzymatic products amplified in the sample, the method achieves high sensitivity without requiring PCR machines or other sophisticated amplification devices.
Solution Approach 2:
The biological sample's own enzymatic systems perform the amplification function automatically. The detection method harnesses these self-amplifying biological processes to generate detectable signals, eliminating the need for external amplification instruments and reducing device complexity while maintaining high detection sensitivity.
2Measurement precision
If amplification methods are used to resolve LOD issues, then detection sensitivity is improved, but the time required for analysis increases to hours or days
Solution Approach 1:
The invention extracts and detects endogenous enzymatic products that are naturally amplified in the sample, bypassing the need for time-consuming external amplification protocols. This approach achieves rapid detection by directly measuring the biological sample's own amplification products rather than waiting for lengthy PCR or culture processes.
3Measurement precision
If sophisticated instruments like mass spectrometers are used for chemical analysis, then measurement precision is improved, but the ease of operation and accessibility in resource-limited environments deteriorates
Solution Approach 1:
The biological sample's own enzymatic systems perform the amplification function automatically. The detection method harnesses these self-amplifying biological processes to generate detectable signals, eliminating the need for external amplification instruments and reducing device complexity while maintaining high detection sensitivity.
4Measurement precision
If purification procedures are used to remove background interference, then measurement precision is improved, but the device complexity and cost increase
Solution Approach 1:
The invention extracts and utilizes endogenous enzymatic amplification capabilities that already exist within the biological sample itself, rather than introducing external complex amplification instruments. By detecting the natural enzymatic products amplified in the sample, the method achieves high sensitivity without requiring PCR machines or other sophisticated amplification devices.
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
This approach reduces the complexity and cost of sample preparation, eliminates the need for amplification, and allows for rapid detection of analytes in under an hour, making it suitable for point-of-care use without requiring electrical power or sophisticated instrumentation, while minimizing the risk of cross-contamination.
Implementation Method 1
a reporting carrier zone located between the sample loading zone and a detection zone, wherein said reporting carrier zone comprises a reporting carrier capable of forming a complex with the analyte; adding a substrate to the detection zone wherein the substrate undergoes a reaction in the presence of proficient enzyme analyte containing reporting carrier
Data Source
AI summary
Lateral flow devices and methods of use for a molecular diagnostic assay are provided. The method is suitable for detection or monitoring of targets, including biological, chemical, and material targets that exist in very low concentrations in biological samples. The methods and devices of the present application are amenable to power source-free point of care testing.