Proton-Bound Adduct Ion Detection for Organophosphorus Compounds
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Solution Overview
Problem
Current detection methods for organophosphorus compounds (OPCs) and illicit drugs at ultra-low levels face challenges due to interference from other trace-level analytes, necessitating improved selectivity and detection limits to identify hazardous compounds and illicit substances in cargo and concealed conveyances.
Innovation Solution
A method involving the formation of proton-bound adduct ions between OPCs and secondary or tertiary amines with high proton affinity, using an ion detector like a mass spectrometer or ion mobility spectrometer, to enhance detection sensitivity and specificity, allowing for detection at parts-per-quadrillion levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used for ultra-low level OPCs and illicit drugs, then detection capability is limited, but selectivity deteriorates due to interference from other trace-level analytes
Solution Approach 1:
The patent introduces a reaction dopant as an intermediary substance that selectively reacts with target analytes (OPCs and illicit drugs) to form proton-bound adduct ions. This mediator enables specific detection by creating unique ion complexes that can be distinguished from other trace analytes, thereby improving both detection limits and selectivity simultaneously
Solution Approach 2:
The patent changes the chemical parameters of the detection system by introducing dopants with specific proton affinity characteristics. By selecting dopants with proton affinities between 220-250 kcal/mol, the system optimizes the formation of proton-bound adducts, enabling detection at parts-per-quadrillion levels while maintaining high selectivity through controlled chemical reactivity
2Measurement precision
If high detection sensitivity is achieved for ultra-low level analytes, then detection acuity improves, but false positives increase due to interference from other trace analytes
Solution Approach 1:
The reaction dopant acts as a selective intermediary that forms proton-bound adducts only with specific target analytes having complementary basicity. This selective interaction enables high detection sensitivity while avoiding false positives from non-target trace analytes, as the dopant- analyte complex has distinct mass-to-charge ratio and mobility characteristics
Solution Approach 2:
The patent performs preliminary chemical reaction in the ionization source region where dopants and analytes form proton-bound adducts before detection. This preliminary action of selective complex formation ensures that only target analytes are enhanced, while other trace analytes remain unreacted and can be distinguished by their different ion characteristics
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 enables accurate detection of OPCs and illicit drugs at extremely low concentrations, improving detection acuity and interdiction efforts by enhancing sensitivity and selectivity, allowing for non-contact detection in various applications such as cargo and baggage screening.
Implementation Method 1
ionizing a vapor sample containing at least one OPC and at least one secondary or tertiary amine
Implementation Method 2
forming a proton-bound adduct ion between at least one OPC and at least one secondary or tertiary amine in a reaction region
Implementation Method 3
detecting the proton-bound adduct ion with the ion detector to confirm presence of the OPC and/or the illicit drug
Data Source
Figure 1A
Figure 1B
Figure 2A~2D
AI summary
A method is disclosed for detecting organophosphorus compounds and illicit drugs using an ion detector. A vapor sample containing at least one analyte and at least one dopant is ionized. A proton-bound adduct ion is formed between the analyte and the dopant in a reaction region defined between the ionization source and the ion detector.