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Structural analysis of oligosaccharides by atmospheric pressure matrix‐assisted laser desorption/ionisation quadrupole ion trap mass spectrometry
Author(s) -
Creaser Colin S.,
Reynolds James C.,
Harvey David J.
Publication year - 2001
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.563
Subject(s) - chemistry , quadrupole ion trap , mass spectrometry , tandem mass spectrometry , ion trap , top down proteomics , collision induced dissociation , analytical chemistry (journal) , glycosidic bond , fragmentation (computing) , tandem , protein mass spectrometry , glycan , ion , chromatography , organic chemistry , glycoprotein , biochemistry , enzyme , materials science , computer science , composite material , operating system
An ion source incorporating a fibre optic interface has been constructed for atmospheric pressure matrix‐assisted laser desorption/ionisation quadrupole ion trap mass spectrometry. The configuration has been applied to the study of linear and complex oligosaccharides. Multi‐stage tandem mass spectrometry (MS n , n = 2–4) experiments carried out in the ion trap enable extended fragmentation pathways to be investigated that yield structural information. Collisional activation of sodiated oligosaccharides, as demonstrated on the model compound maltoheptaose, produces primarily B and Y fragments resulting from cleavage of glycosidic bonds; fragments from cross‐ring cleavages are also observed following further stages of tandem mass spectrometry, providing additional linkage information. The analyses of mixtures of complex oligosaccharides are demonstrated for N‐linked glycans from chicken egg glycoproteins and a ribonuclease glycan mixture. Mass spectrometric and tandem mass spectrometric data for sugars with molecular weights up to 4000 Da is shown for mixtures of linear dextrans and N‐linked glycans. The use of MS n (n = 3, 4) on these complex molecules enabled structural information to be elucidated that confirms data observed in the MS/MS spectra. Copyright © 2001 John Wiley & Sons, Ltd.