G-Quadruplex Lead Ion Detection Paper Using Iridium Complex
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Solution Overview
Problem
Current methods for detecting lead ions in water, such as atomic absorption spectrometry and fluorescent methods, are cumbersome and unable to rapidly detect low levels of lead ions in aqueous samples, posing challenges for in-field monitoring and meeting safe drinking water standards.
Innovation Solution
A label-free G-quadruplex-based assay using a luminescent iridium(III) complex, specifically [Ir(epyd)2(dclphen)]PF6, which forms a G-quadruplex structure in the presence of lead ions, enabling rapid and selective luminescent emission detection, integrated with a paper-based chip for portable monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If atomic absorption spectrometry or inductively coupled plasma mass spectrometry is used for lead ion detection, then measurement precision is improved, but device complexity and ease of operation deteriorate due to sophisticated instrumentation and complicated sample preparation
Solution Approach 1:
The patent replaces complex mechanical and electronic instrumentation systems (AAS, ICP-MS) with a chemical-biological sensing system based on G-quadruplex DNA structures and fluorescent probes. This substitution maintains detection capability while eliminating sophisticated instrumentation requirements, enabling simple visual or portable device-based readout for field use.
Solution Approach 2:
The patent creates a simplified model system using G-quadruplex DNA structures that replicate the lead ion detection function of complex instruments. The DNA-G-quadruplex-fluorescent probe system serves as a biological copy of the detection function, providing equivalent measurement precision through molecular recognition rather than instrumental analysis.
2Measurement precision
If atomic absorption spectrometry or inductively coupled plasma mass spectrometry is used for lead ion detection, then measurement precision is improved, but ease of operation deteriorates due to complicated sample preparation
Solution Approach 1:
The G-quadruplex DNA structure and fluorescent probe system perform self-assembly and self-detection functions. The DNA automatically folds into the G-quadruplex structure upon lead ion binding, and the fluorescent signal is generated automatically without requiring manual sample preparation steps, making the system easy to operate while maintaining precision.
Solution Approach 2:
The G-quadruplex DNA structure serves as an intermediary between the lead ion analyte and the fluorescent detection signal. This molecular mediator enables direct detection in aqueous samples without complex preparation, bridging the gap between simple operation and precise measurement through its specific binding and signal transduction properties.
3Ease of operation
If conventional fluorescent or colorimetric methods are used for lead ion detection, then portability is improved, but detection precision deteriorates due to inability to rapidly detect low levels of lead ions
Solution Approach 1:
The patent creates a composite sensing system combining G-quadruplex DNA structures with highly sensitive fluorescent probes. This composite material integrates the molecular recognition capability of DNA with the optical detection sensitivity of fluorescent compounds, achieving both portability and enhanced detection precision for low level lead ions in the field.
Solution Approach 2:
The patent optimizes key parameters including the fluorescent probe structure, excitation/emission wavelengths, and G-quadruplex sequence composition to maximize detection sensitivity. By carefully tuning these parameters, the system achieves low detection limits suitable for field monitoring while maintaining portability and rapid response.
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 allows for rapid detection of lead ions in water within minutes, providing a portable and cost-effective solution that effectively identifies low levels of lead ions in aqueous samples, surpassing the detection limits of existing methods.
Implementation Method 1
said G-quadruplex-forming sequence reacts with said at least one luminescent iridium(III) complex to emit luminescent emission
Data Source
AI summary
A luminescent Ir(III) complex is used to develop a label-free G-quadruplex-based assay for lead ions in liquid or solution. In particular, the present invention describes method for monitoring lead ion concentration in water.