Electron detachment dissociation and infrared multiphoton dissociation of heparin tetrasaccharides

Franklin E. Leach, Zhongping Xiao, Tatiana N. Laremore, Robert J. Linhardt, I. Jonathan Amster

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Heparin glycosaminoglycans (GAGs) present the most difficult glycoform for analytical characterization due to high levels of sulfation and structural heterogeneity. Recent contamination of the clinical heparin supply and subsequent fatalities has highlighted the need for sensitive methodologies of analysis. In the last decade, tandem mass spectrometry has been increasingly applied for the analysis of GAGs, but developments in the characterization of highly sulfated compounds have been minimal due to the low number of cross-ring cleavages generated by threshold ion activation by collisional induced dissociation (CID). In the current work, electron detachment dissociation (EDD) and infrared multiphoton dissociation (IRMPD) are applied to a series of heparin tetrasaccharides. With both activation methods, abundant glycosidic and cross-ring cleavages are observed. The concept of Ionized Sulfate Criteria (ISC) is presented as a succinct method for describing the charge state, degree of ionization and sodium/proton exchange in the precursor ion. These factors contribute to the propensity for useful fragmentation during MS/MS measurements. Precursors with ISC values of 0 are studied here, and shown to yield adequate structural information from ion activation by EDD or IRMPD.

Original languageEnglish (US)
Pages (from-to)253-259
Number of pages7
JournalInternational Journal of Mass Spectrometry
Volume308
Issue number2-3
DOIs
StatePublished - Dec 1 2011

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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