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Tandem time-of-flight mass spectrometry.

Marvin L Vestal1, Jennifer M Campbell

  • 1Applied Biosystems, Framingham, Massachusetts, USA.

Methods in Enzymology
|January 13, 2006
PubMed
Summary

A novel tandem time-of-flight (TOF-TOF) instrument enables high-performance matrix-assisted laser desorption ionization (MALDI) tandem mass spectrometry (MS). This advancement provides high- and low-energy fragments for sensitive peptide analysis.

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Biochemistry

Background:

  • Matrix-assisted laser desorption ionization (MALDI) is a widely used technique for analyzing biomolecules.
  • Tandem mass spectrometry (MS/MS) enhances molecular identification by fragmenting selected ions.
  • Existing MALDI-TOF instruments have limitations in performing high-energy collision-induced dissociation (CID) for effective tandem MS.

Purpose of the Study:

  • To develop a modified MALDI-TOF instrument capable of high-performance, high-energy CID for MALDI tandem MS.
  • To optimize fragment spectra quality through controlled ion deceleration and collision energy.
  • To demonstrate the sensitivity and utility of the new instrument for peptide analysis.

Main Methods:

  • Modification of a standard MALDI-TOF instrument to incorporate a floating collision cell.
  • Deceleration of precursor ions before collision to optimize fragment spectra.
  • Application of high-energy CID (1-kV) under single-collision conditions with increased laser power for ion formation.
  • Analysis of standard peptides and tryptic digests.

Main Results:

  • Successful implementation of high-performance, high-energy CID MALDI tandem MS.
  • Observation of both high- and low-energy fragments in MALDI TOF-TOF spectra.
  • Demonstrated sensitivity down to 1 femtomole (fmol) for standard peptides.
  • Accurate database identification of peptides from a mixture of tryptic digests at the 25-fmol level using only 23 spectra.

Conclusions:

  • The developed TOF-TOF instrument makes high-performance MALDI tandem MS a practical reality.
  • The instrument offers high sensitivity and is effective for peptide identification in complex mixtures.
  • This technology advances the capabilities of MALDI-based proteomics and biomarker discovery.

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