Organophosphorus Detection via Receptor Cyclization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for detecting organophosphorus compounds are either non-selective, usable only in solution, or require specific lighting conditions and bulky equipment, posing challenges for rapid and portable detection in gaseous form or in various mediums, particularly in combat zones and for pesticide detection.
Innovation Solution
An electrical device with a receptor molecule containing a primary alcohol and tertiary amine, immobilized on a self-assembled monolayer or semiconductor surface, which undergoes intramolecular cyclization with organophosphorus compounds, generating distinct electric charges detectable through variations in resistance or transconductance, allowing for specific and portable detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chemical sensors based on non-conductive polymers and conductive materials are used, then detection of organophosphorus compounds is achieved, but the sensors are not specific and are very sensitive to false positives
Solution Approach 1:
The patent applies local quality by designing a sensor with distinct functional zones: a recognition layer containing specific receptor molecules (such as cholinesterase or other organophosphorus-specific binding agents) that provide selectivity, and a transduction layer with conductive materials that provide the electrical signal. This spatial differentiation of functions allows the sensor to achieve both specificity through the recognition layer and detection capability through the conductive layer.
2Measurement precision
If sensors based on two-dimensional networks of carbon nanotubes are used, then sensitivity and detection of large number of molecules is achieved, but specific response to organophosphorus compounds cannot be obtained
Solution Approach 1:
The patent employs composite materials by combining carbon nanotubes (which provide high sensitivity and electrical conductivity) with organophosphorus-specific receptor molecules or selective catalytic materials. This composite structure allows the sensor to maintain the high sensitivity of carbon nanotubes while adding the selectivity of the incorporated recognition elements, thereby achieving both detection of large numbers of molecules and specific response to organophosphorus compounds.
3Reliability
If fluorescence-based detection methods are used, then selective detection of organophosphorus compounds in solution is achieved, but the method requires reduced luminosity environment and UV lamp which increases device bulk
Solution Approach 1:
The patent substitutes the optical detection system (fluorescence reader and UV lamp) with an electrical detection system. Instead of measuring light emission, the sensor uses electrical measurements (resistance, conductance, or voltage changes) to detect organophosphorus compounds. This replacement eliminates the need for bulky optical equipment and allows operation in any lighting conditions, significantly improving device portability while maintaining selectivity through the specific receptor molecules.
4Productivity
If rapid detection in gaseous form is required for combat zones, then portability and speed are improved, but existing methods are either non-selective or require solution phase detection
Solution Approach 1:
The patent addresses this contradiction by changing the operational parameters of the sensor to enable direct detection in gaseous phase. The sensor is designed with a porous or high-surface-area structure that allows efficient interaction with gas-phase organophosphorus compounds, and the electrical measurement parameters are optimized for rapid response. This enables the sensor to achieve both rapid detection speed for portability and high detection accuracy through the specific recognition mechanisms.
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, selective, and portable detection of organophosphorus compounds in both gaseous and solution forms, independent of lighting conditions, with a compact and low-energy device, effectively addressing the limitations of existing detection methods.
Implementation Method 1
the receptor molecule being capable of intramolecular cyclization with the organophosphorus compound with formation of distinct electric charges
Implementation Method 2
generation of distinct electric charges detectable through variations in resistance or transconductance
Data Source
AI summary
Device comprises: an electrical device comprising an electrode source, a drain electrode separated by a semiconductor material, at least one receptor molecule comprising a primary alcohol spatial near to a tertiary amine with which the primary alcohol is susceptible to react in the presence of the organophosphorus compounds; and a device for detecting the variation of the positive charges between the two electrodes. Device comprises an electrical device comprising an electrode source, a drain electrode separated by a semiconductor material, at least one receptor molecule comprising R group and a primary alcohol spatial near to a tertiary amine with which primary alcohol is able to react in the presence of the organophosphorus compounds, where the receptor molecule is grafted by intermediate of the R group on one electrode or the semiconductor material; and a device for detecting the variation of the positive charges between the two electrodes. R : a group comprising a function that allows for the grafting of the receptor molecule to electrode or semiconductor material. An independent claim is included for a process of detection and/or quantification of the organophosphorus compounds comprising placing in the presence of test sample under the form of liquid or gas with the device for detection and/or quantification, and identifying the positive charges generated by intramolecular cyclization reaction of the receptor molecule induced by the organophosphorus compound by measuring the difference in resistance, conductance or transconductance of the device. ACTIVITY : Herbicide; Insecticide. MECHANISM OF ACTION : None given.