Reaction-Diffusion Nuclemeter for Instrument-Free Nucleic Acid Quantification
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Solution Overview
Problem
Current methods for monitoring and quantifying nucleic acid amplification are costly and require expensive instruments, with low accuracy and sensitivity, especially for enzymatic amplification products detected without instruments.
Innovation Solution
Development of devices and methods using reaction-diffusion based nuclemeters with a sample chamber and reaction-diffusion conduit, capable of holding reactants for nucleic acid amplification, allowing for low-cost, instrument-free monitoring and end-point quantification of target nucleic acids, utilizing a portable processor with fluorescence imaging for measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time PCR machines are used for continuous monitoring of fluorescence emission, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical/optical instrumentation (real-time PCR machines with fluorescence detection systems) with a simpler chemical-biological system. The reaction-diffusion conduit uses passive diffusion of molecules combined with enzymatic amplification to create a visible reaction front that moves through the conduit, eliminating the need for expensive real-time fluorescence monitoring equipment while maintaining quantification capability.
Solution Approach 2:
The invention employs a disposable microfluidic chip containing the reaction-diffusion conduit, which is a low-cost, single-use device. This replaces expensive, reusable instrumentation, allowing precise quantification to be achieved through inexpensive consumables rather than costly equipment.
2Device complexity
If lateral flow strips are used for detection without instruments, then device complexity is reduced, but measurement precision and sensitivity deteriorate
Solution Approach 1:
The patent transforms the detection parameter from simple presence/absence (lateral flow) to continuous spatial position (reaction front location in the conduit). By measuring the position of the reaction front along the conduit length, the system achieves quantitative measurement capabilities similar to instrument-based methods while maintaining simplicity. The reaction-diffusion process creates a graded concentration profile that can be read at multiple positions, enabling precise quantification.
Solution Approach 2:
The invention adds a spatial dimension to the detection process. Instead of reading a single line result from lateral flow, the reaction front position is measured along the length of the conduit, creating a one-dimensional spatial gradient that encodes quantitative information. This dimensional transformation enables precise quantification without requiring complex instrumentation.
3Productivity
If reaction-diffusion conduits are used for amplification and detection, then productivity is improved through high throughput, but device complexity increases
Solution Approach 1:
The patent divides the detection system into multiple parallel reaction-diffusion conduits on a single chip, with each conduit capable of processing an independent sample. This segmentation enables high-throughput processing of multiple samples simultaneously while keeping each individual conduit simple in design. The modular parallel architecture achieves productivity gains without requiring proportionally increased system complexity.
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
Enables accurate and sensitive monitoring and quantification of nucleic acid amplification, facilitating on-site or high-throughput applications, including gene expression profiling, with reproducible results and detection of as few as 50 target RNA copies.
Implementation Method 1
measuring a reaction-diffusion length of said amplified nucleic acid molecule through the one or more conduits, wherein reaction-diffusion length is proportional to the number of nucleic acid copies in the sample and time
Implementation Method 2
continuous monitoring of fluorescence emission from intercalating dye or molecular beacon probes
Data Source
AI summary
Provided herein are devices for monitoring nucleic acid amplification, nucleic acid amplification monitors, methods of quantifying nucleic acid amplification, methods of identifying an unknown nucleic acid molecule, and systems for monitoring nucleic acid amplification. The disclosed devices, methods, and systems comprise at least one nuclemeter, comprising at least one sample chamber and at least one reaction-diffusion conduit in fluid communication with the chamber.