pH-Sensitive Dye Detection in Nucleic Acid Amplification
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Solution Overview
Problem
Current nucleic acid amplification methods, such as PCR and isothermal amplification techniques like LAMP, require complex equipment and long incubation times for detection, limiting their use in point-of-care and field diagnostics, which need rapid and simple tests without sophisticated tools.
Innovation Solution
A method using a buffered amplification reaction with a pH-sensitive dye that changes color in response to pH changes during amplification, allowing visual detection of amplification products without the need for specialized equipment, applicable to various amplification techniques including LAMP, HDA, and PCR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time fluorimetry or post-reaction electrophoresis is used for amplification detection, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs pH-sensitive dyes that undergo color changes in response to pH variations during nucleic acid amplification. This colorimetric detection method allows visual assessment of amplification results without requiring complex fluorimetry equipment or electrophoresis systems, thereby resolving the contradiction between detection accuracy and device complexity
Solution Approach 2:
The patent introduces pH-sensitive dyes as intermediary substances that mediate between the amplification reaction and the detection process. These dyes respond to pH changes caused by amplification and translate them into visible color changes, enabling simple visual detection while maintaining detection accuracy
2Device complexity
If visual detection by direct assessment is used, then device complexity is reduced, but incubation time increases to ≥60 minutes
Solution Approach 1:
The patent optimizes reaction parameters including pH, temperature, and dye concentration to enhance the sensitivity and speed of the color change response. By adjusting these parameters, the method achieves rapid visual detection within 30 minutes or less, resolving the contradiction between equipment simplicity and incubation time
3Ease of operation
If metal-sensitive indicators are used for color change detection, then detection method is simplified, but sensitivity is limited to >100-1000 copies of target
Solution Approach 1:
The patent selects pH-sensitive dyes with specific pH transition ranges that are optimally matched to the local pH conditions of the amplification reaction. This localized optimization of dye properties enhances detection sensitivity below 100 copies while maintaining the simplicity of visual color change detection
4Speed
If intercalating nucleic acid dyes are used for real-time detection, then detection speed is improved, but visualization requires UV illumination equipment
Solution Approach 1:
The patent replaces the need for UV illumination equipment with pH-sensitive dyes that produce visible color changes under ambient light conditions. This substitution eliminates the requirement for sophisticated UV lighting systems while maintaining rapid real-time detection capability
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 rapid, simple, and cost-effective visual detection of nucleic acid amplification products, suitable for point-of-care diagnostics, with results visible within 30 minutes and no requirement for complex equipment, improving diagnostic efficiency and accessibility.
Implementation Method 1
A method using a buffered amplification reaction with a pH-sensitive dye that changes color in response to pH changes during amplification, allowing visual detection of amplification products without the need for specialized equipment
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 Tris buffer in the range of 1.5 mM Tris to 5 mM Tris or equivalent.