Journal of the American Society for Mass Spectrometry

, Volume 19, Issue 12, pp 1897–1905

Atmospheric pressure thermal dissociation of phospho- and sulfopeptides

  • Lívia S. Eberlin
  • Yu Xia
  • Hao Chen
  • R. Graham Cooks


Several phospho- and sulfopeptides were subjected to atmospheric pressure thermal dissociation (APTD), which was effected by passing peptide ions generated by electrosonic spray ionization (ESSI) through a heated coiled metal tube. Sequence informative fragment ions including a-, b-, c-, and y-types of ions were observed with increased relative intensities under APTD compared with collision-induced dissociation (CID), performed inside the ion trap. A certain degree of preservation of phosphate and sulfate ester moieties was observed for some fragments ions under APTD. The neutral fragments generated outside the mass spectrometer were further analyzed via on-line corona discharge to provide rich and complementary sequence information to that provided by the fragment ions directly obtained from APTD, although complete losses of the modification groups were noted. Improved primary sequence information for phospho- and sulfopeptides was typically obtained by analyzing both ionic and neutral fragments from APTD compared with fragment ions from CID alone. Localization of the modification sites of phospho- and sulfopeptides was achieved by combining the structural information acquired from APTD and CID.


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Copyright information

© American Society for Mass Spectrometry 2008

Authors and Affiliations

  • Lívia S. Eberlin
    • 2
  • Yu Xia
    • 2
  • Hao Chen
    • 1
  • R. Graham Cooks
    • 2
  1. 1.Center for Intelligent Chemical Instrumentation, Department of Chemistry and BiochemistryOhio UniversityAthensUSA
  2. 2.Department of ChemistryPurdue UniversityWest LafayetteUSA

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