Paper-Based Colorimetric Sensor Kit for Mercury Detection
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Solution Overview
Problem
Current methods for detecting mercury ions in water require expensive and sophisticated equipment, skilled personnel, and are labor-intensive, making them unsuitable for quick and simple in situ detection with a naked eye.
Innovation Solution
A paper-based colorimetric sensor kit utilizing a circular template for rolling circle amplification (RCA), a primer that hybridizes with the template only in the absence of mercury ions, a DNA polymerase, and a nanoparticle probe labeled to a DNA coil, which forms concentric circles on radial chromatography paper upon reaction, allowing for visual detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods (ICP-MS, AAS, GC) are used for mercury detection, then high sensitivity and selectivity are achieved, but expensive and sophisticated equipment and skilled personnel are required
Solution Approach 1:
The patent employs disposable paper-based test strips with integrated reagents instead of expensive reusable instruments. The test strips are single-use, inexpensive consumables that eliminate the need for costly equipment like ICP-MS while maintaining detection capability through colorimetric readout on paper substrate.
Solution Approach 2:
The patent replaces complex mechanical/electronic detection systems (spectrometers, mass spectrometers) with a simple optical detection system based on colorimetric change visible to the naked eye. The measurement mechanism shifts from instrumental analysis to visual observation of color intensity on the paper strip.
2Measurement precision
If conventional methods are used for mercury detection, then wide range of metal ions can be detected with high sensitivity, but it takes a lot of time and labor-intensive procedure is required
Solution Approach 1:
The patent incorporates pre-prepared reagents and detection components directly onto the paper strip during manufacturing. The primer, DNA polymerase, and other reagents are pre-loaded in ready-to-use form, eliminating time-consuming preparation steps in the laboratory and enabling immediate detection upon sample application.
Solution Approach 2:
The test strip performs self-contained detection without requiring external laboratory equipment or complex operational procedures. The system is self-sufficient, with all reagents and detection mechanisms integrated into a single portable unit that automatically processes the sample and provides visual results.
3Measurement precision
If conventional detection equipment is used, then high sensitivity detection is achieved, but bulky and expensive tools are required
Solution Approach 1:
The patent extracts the essential detection function from bulky laboratory equipment and concentrates it into a minimal paper-based format. By removing unnecessary components and retaining only the core detection chemistry on paper, the system achieves high sensitivity without the weight and complexity of traditional instruments.
Solution Approach 2:
The patent uses thin paper substrate as the detection platform, replacing heavy metallic and electronic components with flexible, lightweight paper-based structures. The paper strip serves as both the support matrix and the active sensing element, providing portability while maintaining detection functionality.
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, cost-effective, and portable detection of mercury ions without the need for bulky equipment, allowing for quick and simple in situ diagnosis with a naked eye, unaffected by lighting conditions.
Implementation Method 1
a primer that hybridizes to the circular template and does not hybridize to the circular template when a mercury ion is bonded thereto
Implementation Method 2
a DNA polymerase; mixing the circular template for RCA, a DNA polymerase, a nanoparticle probe labeled to a DNA coil formed in the circular template for RCA
Implementation Method 3
a nanoparticle probe labeled to a DNA coil formed in the circular template for RCA
Implementation Method 4
a radial chromatography paper; adding the solution in which the RCA reaction is completed dropwise to a radial chromatography paper
Data Source
AI summary
There is provided a paper-based colorimetric sensor kit for quickly and simply diagnosing mercury in situ with a naked eye. The paper-based colorimetric sensor kit includes: a circular template for rolling circle amplification (RCA); a primer that does not hybridize to the circular template when a mercury ion is bonded to a primer that hybridizes to the circular template; a DNA polymerase; a sensing material kit including a nanoparticle probe labeled to a DNA coil formed in the circular template for RCA; and a radial chromatography paper.