Electrochemical Nucleic Acid Detection via Solution-Phase Hybridization
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Solution Overview
Problem
Current nucleic acid detection methods, particularly those based on immobilization and optical signals, face challenges such as low hybridization efficiency, long assay times, and complexity, especially in point-of-care testing applications, where they are cumbersome and expensive, and struggle with multiplexing and accuracy.
Innovation Solution
A real-time electrochemical method for detecting and quantifying nucleic acids using a solid phase or solution phase approach with electrochemically conductive markers that incorporate into PCR-produced polynucleotides, allowing for signal-on detection without probe immobilization, utilizing a microchip with integrated electrodes and thermal control for efficient and accurate nucleic acid analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If immobilization-based electrochemical DNA detection is used, then probe stability is improved, but hybridization efficiency decreases and assay time increases
Solution Approach 1:
The invention extracts the probe from the immobilized state on the electrode surface and places it in the solution phase. The probe remains free in solution during hybridization, eliminating the diffusion limitation to the electrode surface while maintaining detection capability through the electrochemical label.
Solution Approach 2:
The invention introduces an electrochemical label (such as ferrocene) as an intermediary that couples to the probe in solution. This label serves as a mediator that enables electrochemical detection without requiring the probe itself to be immobilized on the electrode surface.
2Stability of the object's composition
If immobilization-based electrochemical DNA detection is used, then probe stability is improved, but device complexity increases
Solution Approach 1:
The invention removes the immobilization step and associated surface chemistry complexity from the assay protocol. By conducting hybridization in solution and detecting via the electrochemical label, the method simplifies the overall device and protocol complexity.
3Measurement precision
If optical detection methods are used, then detection capability is improved, but device portability and cost worsen
Solution Approach 1:
The invention substitutes the optical detection system with an electrochemical detection system. Instead of using light sources, detectors, and optical pathways, the method uses electrochemical labels that generate electrical signals directly, enabling miniaturization and portability.
4Measurement precision
If competitive hybridization at electrode interface is used, then detection is achieved, but hybridization efficiency decreases and assay time increases
Solution Approach 1:
The invention extracts the hybridization process from the electrode interface and moves it to the solution phase. This eliminates the diffusion limitation where target and competitor DNA must travel to the electrode surface, significantly reducing hybridization time while maintaining detection accuracy through the electrochemical label.
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 method significantly reduces assay time, enhances hybridization efficiency, and provides accurate, reproducible results suitable for point-of-care testing, offering a cost-effective and portable solution for nucleic acid analysis, capable of multiplexing and integrating into miniaturized devices.
Implementation Method 1
an electrochemically or electrically conductive marker(s) that is(are) adapted for incorporation into a polynucleic acid(s) by chain polymerization and when incorporated thereof produces a signal(s) change(s) if subjected to an electric potential
Implementation Method 2
utilizing a microchip with integrated electrodes and thermal control for efficient and accurate nucleic acid analysis
Implementation Method 3
A real-time electrochemical method for detecting and quantifying nucleic acids using a solid phase or solution phase approach with electrochemically conductive markers
Data Source
AI summary
A method for electrochemically or electrically detecting nucleic acids, utilizes electrochemically active or electrically conductive reporter materials. An electric voltage is applied and electric signals are measured to the electrodes that are suitable for detecting or quantifying the nucleic acid(s) in a sample. This technique is suitable for point-of-use applications, e.g. detecting bioanalytes in remote locations. A microchip, device, kit used adapted to be used for this method is also disclosed.