pH-Sensitive Dye Nucleic Acid Detection in Weak Buffers
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Solution Overview
Problem
Current DNA amplification detection methods, such as isothermal and PCR techniques, often require long incubation times, sophisticated equipment, and are not suitable for point-of-care or field diagnostics due to their complexity and cost.
Innovation Solution
A method using a pH-sensitive dye in a weakly-buffered solution with DNA polymerase, allowing for visual or fluorescent detection of nucleic acid amplification by monitoring pH changes, which can be achieved with minimal equipment and in less than 30 minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional detection methods (electrophoresis, fluorescence detection) are used, then detection reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the detection function from complex instrumentation to a simple visual observation system. By using pH-sensitive dyes that change color in response to amplification, the method removes the need for sophisticated detectors while maintaining reliability through the inherent visual detectability of color changes.
Solution Approach 2:
The invention employs inexpensive, single-use reagents (pH-sensitive dyes and weak buffering agents) that eliminate the need for expensive, maintainable instruments. The detection system becomes a disposable chemical assay rather than a capital-intensive instrument-based method.
2Measurement precision
If traditional detection methods are used, then detection precision is improved, but incubation time increases
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by using weak buffering agents (less than 1 mM Tris or equivalent) instead of strong buffers. This parameter change allows pH to respond more dynamically and rapidly to amplification events, reducing incubation time while maintaining detection precision through the sensitivity of pH-sensitive dyes.
3Reliability
If sophisticated detection equipment is used, then detection reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The detection system performs self-detection through visual color changes that do not require external instrumentation. The pH-sensitive dye automatically responds to amplification by changing color, making the system self-reporting and eliminating the need for complex operational procedures or specialized training.
4Stability of the object's composition
If standard buffering conditions are used, then reaction stability is improved, but detection sensitivity deteriorates
Solution Approach 1:
The patent deliberately changes the buffering parameter to weak buffering conditions (less than 1 mM Tris or equivalent buffering agent). This creates a system where pH is stable enough to support amplification but sensitive enough to detect amplification events through pH changes, optimizing both reaction stability and detection sensitivity simultaneously.
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 enables rapid, reliable, and cost-effective detection of nucleic acid amplification, suitable for point-of-care and field diagnostics, with visible color changes or fluorescent signals indicating successful amplification without the need for complex instrumentation.
Implementation Method 1
detecting a change in spectral properties of the dye resulting from amplification of the target DNA
Implementation Method 2
the pH sensitive dye is either a visually detectable color dye or a fluorescent dye
Implementation Method 3
the pH sensitive dye is either a visually detectable color dye or a fluorescent dye
Data Source
AI summary
Methods are provided for a rapid, low cost approach to monitoring an amplification reaction. This includes monitoring the progress of isothermal or PCR amplification reactions to completion using pH-sensitive dyes that are either colored or fluorescent. Compositions are described that include a mixture of a DNA polymerase, deoxyribonucleotide triphosphate and a weak buffer of less than 1 mM Tris or equivalent or no buffer.