Sensor Compounds for Selective Non-Explosive Analyte Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sensors for detecting fluid analytes face challenges in achieving high sensitivity and selectivity, particularly due to the limited availability of air-stable n-type organic materials.
Innovation Solution
Development of sensor compounds with specific structural formulas (Formulas I, II, and III) that exhibit changes in conductivity or fluorescence upon exposure to non-explosive analytes, utilizing n-type semiconductor properties to facilitate detection through electron transfer and fluorescence quenching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluorescent dyes are used for pH sensing, then the sensing function is achieved, but photostability deteriorates due to rapid photodegradation
Solution Approach 1:
The patent replaces conventional fluorescent dyes with a genetically encoded pH-sensitive fluorescent protein (pH-sensitive Fp) that exhibits enhanced photostability. This substitution of the sensing mechanism achieves the same pH sensing function while dramatically improving resistance to photodegradation, allowing the sensor to maintain functionality over extended periods of repeated imaging.
2Reliability
If pH-sensitive fluorescent proteins are engineered for improved photostability, then photostability improves, but protein folding and function may deteriorate
Solution Approach 1:
The patent introduces specific point mutations at targeted locations within the pH-sensitive Fp structure (e.g., F64L, S65T, T202Y mutations in GFP-derived proteins). These localized structural modifications enhance photostability without disrupting the overall protein folding or pH-sensing mechanism, thereby maintaining both structural integrity and functional performance.
Solution Approach 2:
The patent systematically varies amino acid residues at critical positions within the Fp to optimize the balance between photostability and functional performance. By changing specific parameters such as residue identity at key positions (e.g., positions 64, 65, 202), the invention achieves enhanced photostability while preserving proper protein folding and pH-responsive fluorescence characteristics.
3Reliability
If multiple amino acid substitutions are introduced to enhance photostability, then photostability improves, but the complexity of protein engineering increases
Solution Approach 1:
The patent divides the protein engineering process into manageable segments by focusing mutations on specific, predetermined positions within the Fp structure. Rather than attempting comprehensive optimization of all residues, the invention targets key positions (such as 64, 65, and 202) that have the greatest impact on photostability, thereby simplifying the engineering process while achieving substantial improvements.
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 sensor compounds demonstrate enhanced sensitivity and selectivity in detecting a wide range of non-explosive analytes, including toxic industrial chemicals, chemical warfare agents, and food safety chemicals, by showing detectable changes in electrical conductivity or fluorescence.
Implementation Method 1
The pH-sensitive Fp of the present invention has an improved ratio of fluorescence intensity at different pH levels
Implementation Method 2
pH-sensitive fluorescent proteins (pH-sensitive Fp) that have improved photostability and/or an improved ratio of fluorescence intensity at different pH levels
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E~2A
AI summary
Methods of detecting a non-explosive analyte can include exposing a sensor compound to a non-explosive analyte and displaying a change in the sensor compound upon exposure of the sensor compound to the non-explosive analyte. A variety of sensor compounds for detecting a target analyte, including both explosive and non-explosive analytes, is also described. Sensor devices for detecting a target analyte can include a substrate and a sensor compound positioned on the substrate in a plurality of detection zones.