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Fragmentation of negative ions from carbohydrates: Part 3. Fragmentation of hybrid and complex N-linked glycans

  • David J. HarveyEmail author
Articles

Abstract

Hybrid and complex N-linked glycans were ionized by electrospray in the presence of ammonium nitrate to give [M +NO3] and [M +(NO3)2]2− ions. Low energy collision-induced decomposition (CID) spectra of both types of ions were almost identical and were dominated by C-type glycosidic and cross-ring fragments, unlike the corresponding spectra of the positive ions that contained mainly B- and Y-type glycosidic fragments. Also, in contrast to fragments in the positive ion spectra, many of these ions appeared to be produced by single pathways following proton abstraction from specific hydroxy groups. Consequently, many ions were diagnostic for specific structural features. Such features included the composition of each of the two antennas, the presence or absence of a bisecting GlcNAc residue, and the location of fucose residues on the core GlcNAc residues and on the antennas. C-ions defined the sequence of the constituent monosaccharide residues. Detailed fragmentation mechanisms are proposed to account for several of the diagnostic ions.

Keywords

Sialic Acid GlcNAc Fucose Sialic Acid Residue GlcNAc Residue 
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 2005

Authors and Affiliations

  1. 1.Department of Biochemistry, Glycobiology InstituteUniversity of OxfordOxfordUnited Kingdom

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