Dicationic Liquid Salts for ESI-MS Anion Detection
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Solution Overview
Problem
Current electrospray ionization-mass spectrometry (ESI-MS) techniques face issues with background peaks, reduced stability of ion current, and the need for unconventional solvents, which hinder effective detection and quantitation of anions.
Innovation Solution
The use of dicationic liquid salts with a specific dicationic species structure, corresponding to Formula I, and a counter-anion, which form a salt complex with anions to enhance detection sensitivity and specificity in ESI-MS by moving anions to a higher mass range and reducing chemical noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ESI-MS techniques are used for anion detection, then the detection method is simple, but background peaks increase and detection sensitivity decreases
Solution Approach 1:
The patent introduces dicationic liquid salts as intermediary reagents that form salt complexes with target anions. These complexes serve as mediators between the anions and the ESI-MS detection system, enabling sensitive detection by forming detectable ion complexes while the dicationic structure suppresses chemical noise and background peaks in the low mass region
Solution Approach 2:
The patent changes the mass parameter by forming salt complexes between dicationic reagents and anions, which shifts the detected ions from low mass regions (dominated by chemical noise) to higher mass regions where detection sensitivity is improved and background interference is reduced
2Reliability
If unconventional solvents are used in ESI-MS, then detection capability is maintained, but ion current stability decreases
Solution Approach 1:
The patent utilizes the unique properties of dicationic liquid salts that exhibit liquid behavior at room temperature with appropriate solvent selection. The specific parameter changes involve selecting solvents that maintain the liquid state and optimal ionization characteristics, thereby achieving stable ion current while using practical solvent systems
3Measurement precision
If dicationic liquid salts are used to move anions to higher mass range, then detection sensitivity increases, but device complexity increases
Solution Approach 1:
The patent employs dicationic liquid salts with specific structural parameters (two positively charged imidazolium rings connected by spacer groups) that enable the formation of detectable salt complexes. The parameter changes in the reagent structure (dicationic vs monocationic) directly improve detection limits by shifting ions to higher mass ranges where ESI-MS has superior sensitivity
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 significantly increases the sensitivity and selectivity of anion detection, moving anions out of low mass regions dominated by chemical noise and improving detection limits, while being non-volatile and stable over a wide temperature range.
Implementation Method 1
electrospray ionization-mass spectrometry (ESI-MS)
Implementation Method 2
form a salt complex with anions to enhance detection sensitivity and specificity
Data Source
AI summary
Imidazolium-based dicationic liquid salts and methods of using such imidazolium-based dicationic liquid salts in techniques such as ESI-MS are provided.