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Related Experiment Videos

A CE/ESI-MS interface for stable, low-flow operation

D P Kirby1, J M Thorne, W K Götzinger

  • 1Bamett Institute, Boston, Massachusetts, USA. dankirby@ma.ultranet.com

Analytical Chemistry
|December 15, 1996
PubMed
Summary
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A new liquid sheath interface improves on-line capillary electrophoresis/mass spectrometry (CE/MS) stability, especially at low flow rates. Active capillary positioning enables automated in-probe focusing for enhanced CE/MS analysis.

Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Mass Spectrometry

Background:

  • On-line capillary electrophoresis coupled with mass spectrometry (CE/MS) requires stable interfaces for reliable analysis.
  • Achieving stable electrospray, particularly at low flow rates, remains a challenge in CE/MS applications.

Purpose of the Study:

  • To describe a robust and stable liquid sheath interfacing procedure for on-line CE/MS.
  • To demonstrate the effectiveness of active capillary positioning for stable electrospray and on-line focusing techniques.

Main Methods:

  • Development of a liquid sheath interface with optimized component sizes and tapered capillary tips.
  • Implementation of active capillary positioning for precise adjustment during electrospray.
  • Integration of in-probe isoelectric focusing with CE/MS analysis.

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Main Results:

  • Achieved a stable electrospray interface effective at low flow rates (down to 250 nL/min).
  • Demonstrated successful on-line capillary isoelectric focusing with in-probe focusing and subsequent mass spectrometry detection.
  • Showcased the suitability of the developed interface for automation.

Conclusions:

  • The described liquid sheath interfacing procedure offers a rugged and stable solution for on-line CE/MS.
  • Active capillary positioning is a key innovation enabling both stable low-flow CE/MS and automated in-probe focusing.
  • This advancement facilitates more reliable and automated hyphenated separation techniques.