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Fragmentation of benzylpyridinium “thermometer” ions and its effect on the accuracy of internal energy calibration

  • Konstantin V. Barylyuk
  • Konstantin Chingin
  • Roman M. Balabin
  • Renato Zenobi
Article

Abstract

Electrospray ionization mass spectrometry (ESI-MS) is a powerful analytical method to study biomolecules and noncovalent complexes. The prerequisite for their intact observation is soft ionization. In ESI, the internal energy of ions is primarily influenced by collisional activation in the source. The survival yield method is frequently used to probe the energy deposition in ions during the electrospray process. In the present work, we investigate the fragmentation pathways of para-substituted benzylpyridinium ions, the most widely used “thermometer ions” in the survival yield method. In addition to the C-N bond cleavage, alternative fragmentation channels were found for the compounds studied. We consider these pathways to result from intramolecular rearrangements. The effect of these additional fragments on the accuracy of the internal energy calibration is estimated for both collision-cell and in-source collision-induced dissociation (CID). Altogether, results presented suggest that a correction of the energy scale is necessary for the method based on benzylpyridinium ions to precisely quantify ion internal energies.

Keywords

Internal Energy Collisional Activation Additional Fragment Internal Energy Distribution Survival Yield 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© American Society for Mass Spectrometry 2010

Authors and Affiliations

  • Konstantin V. Barylyuk
    • 1
  • Konstantin Chingin
    • 1
  • Roman M. Balabin
    • 1
  • Renato Zenobi
    • 1
  1. 1.Department of Chemistry and Applied BiosciencesETH Zürich, ETH HönggerbergZürichSwitzerland

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