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A predictive model for matrix and analyte effects in electrospray ionization of singly-charged ionic analytes
1Department of Chemistry, University of New Mexico, Albuquerque 87131-1096, USA.
Analytical Chemistry
|December 24, 1997
Summary
Electrospray ionization (ESI) produces charged droplets, with ion production linked to surface charge. An equilibrium model explains analyte response, showing concentration-dependent behavior and selective effectiveness in mass spectrometry.
Area of Science:
- Analytical Chemistry
- Physical Chemistry
Background:
- Electrospray ionization (ESI) is a key technique in mass spectrometry for generating ions from solution.
- The fundamental processes governing ion formation and analyte response in ESI are complex and not fully understood.
Purpose of the Study:
- To develop and validate an equilibrium model for predicting analyte response in ESI.
- To explain the selective effectiveness of ESI based on analyte concentration and electrolyte presence.
Main Methods:
- Development of an equilibrium model based on competition for surface charge sites.
- Analysis of analyte response curves as a function of analyte and electrolyte concentrations.
Main Results:
- The model accurately predicts response curves for singly-charged analytes.
- At low analyte concentrations, response is linear and suppressed by excess electrolyte.
- At high analyte concentrations, response becomes independent of analyte concentration but sensitive to co-analyte presence.
Conclusions:
- The equilibrium model provides a robust explanation for ESI behavior.
- Analyte concentration and electrolyte levels critically influence ESI response and selectivity.
- Understanding these factors enhances the application of ESI in mass spectrometry.