Chemosensing Agents for Rapid Hydrogen Sulfide Detection
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Solution Overview
Problem
Current methods for detecting hydrogen sulfide (H2S) are limited by long reaction times, use of toxic reagents, and high detection limits, making them unsuitable for rapid and accurate detection in biological systems, particularly for physiological concentrations of H2S.
Innovation Solution
Development of chemosensing agents with reactive functional groups covalently connected to fluorophores that undergo spectroscopically observable changes upon exposure to H2S, allowing for rapid, selective, and sensitive detection with low detection limits, even in aqueous solutions like blood and plasma, without the need for additional reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If standard colorimetric assay methods are used for H2S detection, then detection can be performed with conventional reagents, but the reaction time is long (10-30 minutes) and additional reagents are required
Solution Approach 1:
The patent combines the reactive functional group and fluorophore into a single chemosensing agent molecule, eliminating the need for separate reagents. The chemosensing agent contains both the H2S-reactive moiety and the fluorescent reporting group covalently linked together, allowing rapid detection without requiring multiple separate chemical additions.
Solution Approach 2:
The chemosensing agent is self-sufficient, containing all necessary components within its molecular structure. Upon H2S binding, the agent autonomously undergoes the chemical reaction and generates the fluorescent signal without requiring external reagents or additional processing steps.
2Measurement precision
If standard colorimetric assay with methylene blue is used, then H2S can be detected, but the detection limit is high and the relationship between absorption and concentration is non-linear
Solution Approach 1:
The patent changes the detection parameter from colorimetric absorption measurement to fluorescent emission measurement. This parameter change provides several advantages: fluorescent detection offers lower detection limits, linear response to H2S concentration, and eliminates the need for toxic reagents and harsh reaction conditions required by conventional colorimetric methods.
Solution Approach 2:
The patent replaces the chemical mechanism of colorimetric detection (which requires toxic reagents like Fe3+ and HCl) with a fluorescent detection mechanism. This substitution eliminates the need for harmful chemicals while providing superior detection sensitivity and linearity.
3Speed
If rapid detection is achieved using fluorescent chemosensors, then reaction time is reduced to minutes, but detection sensitivity may be compromised
Solution Approach 1:
The patent introduces a fluorophore as an intermediary component that transduces the chemical binding event (H2S reaction with reactive group) into a highly detectable fluorescent signal. This intermediary mechanism amplifies the detection sensitivity, allowing rapid equilibration times (minutes) while maintaining low detection limits through the high quantum yield of fluorescent emission.
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
The chemosensing agents provide a rapid and sensitive means to detect H2S with detection limits below 10 μM, achieving equilibrium within minutes, and are stable for long-term storage, enabling accurate quantification in biological samples with minimal interference from other anions.
Implementation Method 1
chemosensing agents contain one or more reactive functional groups covalently connected to a fluorophore... elicits one or more spectroscopically observable changes in the fluorophore's photophysical properties
Implementation Method 2
The reactive functional groups can be any moieties which undergo a chemical reaction in the presence of H2S
Data Source
AI summary
Selective chemosensing agents for hydrogen sulfide are provided. The chemosensing agents can act fast under mild conditions, are chemically stable for long-term storage, are sensitive for detection under near physiological conditions, show a linear concentration-signal relationship within physiologically relevant hydrogen sulfide concentration ranges for easy quantitation, show minimal or no interference by other anions in the blood, and are functional in aqueous solutions and blood plasma.