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Atmospheric pressure MALDI-fourier transform mass spectrometry.
Katherine A Kellersberger1, Phillip V Tan, Victor V Laiko
1Department of Chemistry/Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250, USA.
Analytical Chemistry
|July 16, 2004
Summary
Atmospheric pressure matrix-assisted laser desorption/ionization coupled with Fourier transform mass spectrometry (AP MALDI-FTMS) offers high-resolution analysis of complex peptide mixtures. This method overcomes ion energy limitations, enabling sensitive and accurate detection for advanced proteomic applications.
Area of Science:
- Analytical Chemistry
- Mass Spectrometry
- Proteomics
Background:
- High-resolution analysis of complex peptide mixtures is crucial for proteomics.
- Traditional vacuum matrix-assisted laser desorption/ionization (MALDI) can produce high-energy ions, hindering Fourier transform mass spectrometry (FTMS) analysis due to metastable decay.
- Previous efforts focused on controlling ion energy for improved MALDI-FTMS performance.
Purpose of the Study:
- To describe the coupling of atmospheric pressure matrix-assisted laser desorption/ionization (AP MALDI) with FTMS.
- To demonstrate the significance of AP MALDI-FTMS for high-resolution analysis of complex peptide mixtures.
- To evaluate the performance of AP MALDI-FTMS compared to existing methods.
Main Methods:
- Coupling of atmospheric pressure matrix-assisted laser desorption/ionization (AP MALDI) with Fourier transform mass spectrometry (FTMS).
- Analysis of complex peptide mixtures, including a trypsin digest of bovine serum albumin.
- Comparison of AP MALDI-FTMS with electrospray ionization-FTMS and ion trap analyzers.
Main Results:
- AP MALDI generates less energetic ions than vacuum MALDI, reducing metastable decay and increasing ion currents for detection.
- AP MALDI-FTMS achieved resolution and accuracy comparable to electrospray ionization-FTMS for complex peptide mixtures.
- Analysis of a bovine serum albumin digest showed signal-to-noise ratios and limits of detection similar to ion trap analyzers but with superior resolution and accuracy.
- AP MALDI-FTMS successfully analyzed isobaric peptides differing by less than 0.04 Da, demonstrating its potential for high-resolution screening.
Conclusions:
- AP MALDI-FTMS is a powerful technique for high-resolution analysis of complex peptide mixtures.
- The method offers reduced metastable decay and improved ion availability for detection and tandem experiments.
- AP MALDI-FTMS provides high sensitivity, accuracy, and resolution, making it suitable for proteomic screening and analysis.