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Related Concept Videos

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Electrospray Regime Controls Sensitivity and Quantitative Performance in Micro- and Nano-Flow CE-ESI-MS.

Ryan M O'Neal1, Laura G Rodriguez1, Peter Nemes1

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Summary
This summary is machine-generated.

Optimizing electrospray ionization (ESI) regimes, specifically the cone-jet (CJ) mode, significantly enhances sensitivity and data quality in capillary electrophoresis-mass spectrometry (CE-ESI-MS) for metabolite and peptide analysis.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Mass Spectrometry

Background:

  • Electrospray ionization (ESI) is crucial for ion formation in mass spectrometry (MS), but its regime is often poorly defined in workflows.
  • Capillary electrophoresis-mass spectrometry (CE-ESI-MS) utilizes different ESI interfaces (microflow for metabolites, nanoflow for peptides/proteins).

Purpose of the Study:

  • To benchmark the performance of cone-jet (CJ) and pulsating (P) ESI regimes in CE-ESI-MS for trace-level analyses.
  • To evaluate the impact of CJ and P regimes across microflow (μESI) and nanoflow (nanoESI) interfaces.

Main Methods:

  • Comparative analysis of CJ and P ESI regimes using time-of-flight and timsTOF mass spectrometers.
  • Application to trace metabolites, peptides, and proteome digests, including single-cell-scale samples.

Main Results:

  • In CE-μESI, CJ improved metabolite sensitivity (up to 2-fold), signal stability, and peptide charge state compared to P.
  • In CE-nanoESI proteomics, CJ increased peptide/protein identifications (~50%), identified more low-abundance proteins, and improved quantification completeness.
  • CJ enhanced metabolite feature detection and protein group recovery in Xenopus laevis samples.

Conclusions:

  • The ESI regime is a controllable factor influencing sensitivity and quantitative performance in CE-ESI-MS.
  • Selecting the optimal ESI regime, particularly CJ, is critical for trace-limited analyses and provides practical guidance.