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Evidence for linkage position determination in cobalt coordinated pentasaccharides using ion trap mass spectrometry

  • Stefan König
  • Julie A. Leary
Articles

Abstract

A methodology to determine the linkage position of oligosaccharides is presented. In order to illustrate this technique, several oligosaccharides and disaccharides were ionized by electrospray and analyzed in a Paul trap mass spectrometer. Multiple stage tandem mass spectrometry experiments were used to determine linkage and structural information for the following four cobalt coordinated and singly charged ([M+Co−H]+) pentasaccharides: Lacto-N-fucopentaose I, II, III, and V. In order to differentiate between linkage positions, multiple low energy collision induced experiments with mass selected C type ions have been carried out in an ion trap mass spectrometer. Because of the coordination with cobalt, which directs the dissociation pathways, these C type ions undergo specific fragmentation reactions upon low energy collision induced dissociation. These dissociation pathways are unambiguously dependent on their linkage position, thus allowing differentiation between 1→2, 1→3, 1→4, and 1→6 linkage positions throughout the oligomers. Studies on various linked disaccharides and N-acetyl-disaccharides, which are smaller constituents of the pentasaccharides, were used to verify and confirm the results obtained from the pentasaccharides.

Keywords

GlcNAc Fucose Neutral Loss Dehydro Dissociation Pathway 
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 1998

Authors and Affiliations

  1. 1.College of ChemistryUniversity of CaliforniaBerkeleyUSA

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