Electrospray Ionization Mass Spectrometry Neutral Compound Speciation
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Solution Overview
Problem
Conventional electrospray ionization mass spectrometry (ESI-MS) techniques are limited in analyzing complex petroleum samples like crude oil and bitumen, particularly failing to provide complete compositional analysis of neutral or near-neutral compounds due to limitations in analyte acidity or basicity in common solvent systems.
Innovation Solution
The use of specific ionization agents such as silver triflate in positive ion mode and compounds of formula [NX4+][OH−], like tetrabutylammonium hydroxide or tetramethyl ammonium hydroxide, in negative ion mode, to enhance the speciation of petroleum compounds by improving the detection of neutral and near-neutral species in ESI-MS, allowing for better analysis of hydrocarbon and heteroatom-containing molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional ESI solvent systems (toluene and methanol) are used, then the analysis is simple and straightforward, but the chemical scope is limited and unable to provide complete compositional analysis of neutral or near-neutral compounds
Solution Approach 1:
The patent introduces an intermediary substance (ionization agent such as silver triflate or tetrabutylammonium hydroxide) that mediates between the neutral analyte and the ESI process. This intermediary enables ionization of neutral compounds without requiring complex solvent system modifications, thus expanding chemical scope while maintaining relative simplicity.
Solution Approach 2:
The patent changes the chemical parameter of the solvent system by adding specific ionization agents that modify the ionization behavior. This allows neutral and near-neutral compounds to be analyzed by ESI-MS, expanding the chemical scope from only acidic/basic compounds to include neutral species.
2Measurement precision
If conventional ESI-MS methods are used without ionization agents, then the method is simple and fast, but it cannot detect neutral or near-neutral compounds in petroleum samples
Solution Approach 1:
Ionization agents serve as intermediaries that facilitate the detection of neutral compounds. These agents (e.g., silver triflate, tetrabutylammonium hydroxide) interact with neutral analytes to form detectable ions, thereby enabling complete compositional analysis without fundamentally complicating the ESI-MS methodology.
Solution Approach 2:
The ionization agent is added to the sample solution before analysis, performing preliminary chemical modification of neutral compounds to make them ionizable. This preliminary action ensures that all compound types are detectable during the subsequent ESI-MS analysis.
3Measurement precision
If standard ionization reagents are used, then the analysis procedure is straightforward, but the speciation of petroleum compounds including neutral species is incomplete
Solution Approach 1:
The patent modifies the chemical parameters of the ionization system by selecting reagents with specific properties (silver triflate for positive ion mode, tetraalkylammonium hydroxides for negative ion mode). These parameter changes enable accurate speciation of diverse petroleum compounds including neutral species, while the operational procedure remains relatively simple.
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
These ionization agents enable superior speciation of petroleum compounds, including sulfur, nitrogen, and oxygen-containing species, providing more comprehensive and accurate compositional information compared to conventional methods, overcoming the limitations of acidity and basicity in ESI-MS analysis.
Implementation Method 1
electrospray ionization mass spectrometry (ESI-MS) techniques are limited in analyzing complex petroleum samples
Implementation Method 2
The use of specific ionization agents such as silver triflate in positive ion mode and compounds of formula [NX4+][OH−], like tetrabutylammonium hydroxide or tetramethyl ammonium hydroxide, in negative ion mode, to enhance the speciation of petroleum compounds
Data Source
AI summary
A method of enhanced speciation of both positive and negatives species in an analyte is disclosed. The method can include producing a first analyte solution comprising an analyte composition and an effective amount of silver triflate, and analyzing the first analyte solution with an electrospray ionization mass spectrometer. The method can also include producing a second analyte solution comprising a portion of the analyte composition and an effective amount of a compound of formula I, and analyzing the second analyte solution with an electrospray ionization mass spectrometer. The compound of formula I is [NX+][OH−], where X is a linear, branched, or cyclic C1-C10 alkane; an aryl; a heterocyclic aromatic; or a heterocyclic moiety.