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On-line MALDI-TOF MS using a continuous vacuum deposition interface

J Preisler1, F Foret, B L Karger

  • 1Barnett Institute, Northeastern University, Boston, Massachusetts 02115, USA.

Analytical Chemistry
|December 30, 1998
PubMed
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A novel interface enables continuous on-line MALDI-TOF MS analysis. This method achieves attomole detection limits and reproducible signals for complex mixtures, enhancing analytical capabilities.

Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry

Background:

  • Continuous on-line analysis is crucial for high-throughput screening.
  • Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) is a powerful analytical technique.
  • Integrating separation methods with MALDI-TOF MS can improve complex mixture analysis.

Purpose of the Study:

  • To develop and present a new interface for continuous on-line MALDI-TOF MS.
  • To demonstrate the interface's capability for high-sensitivity and reproducible analysis.
  • To showcase the integration of microcolumn separation techniques with MALDI-TOF MS.

Main Methods:

  • A continuous on-line interface was designed for MALDI-TOF MS.
  • Liquid samples (100-400 nL/min) mixed with matrix were deposited onto a rotating quartz wheel.

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  • Laser desorption occurred on the wheel, with rapid solvent evaporation forming a narrow sample trace.

    • Main Results:

    • The interface produced a thin (approx. 50-micron) amorphous sample trace.
    • Excellent signal reproducibility and attomole detection limits were achieved.
    • Successful on-line coupling with capillary electrophoresis MALDI-TOF MS for a 12-peptide mixture was demonstrated.

    Conclusions:

    • The developed interface enables continuous on-line MALDI-TOF MS analysis.
    • The system offers high sensitivity, reproducibility, and potential for rapid separation and trace analysis.
    • This approach is promising for analyzing complex biological and chemical mixtures.