Electron detachment dissociation of neutral and sialylated oligosaccharides.
Electron detachment dissociation (EDD) has recently been shown by Amster and coworkers to constitute a valuable analytical approach for structural characterization of glycosaminoglycans. Here, we extend the application of EDD to neutral and sialylated oligosaccharides. Both branched and linear structures are examined, to determine whether branching has an effect on EDD fragmentation behavior. EDD spectra are compared to collisional activated dissociation (CAD) and infrared multiphoton dissociation (IRMPD) spectra of the doubly and singly deprotonated species. Our results demonstrate that EDD of both neutral and sialylated oligosaccharides provides structural information that is complementary to that obtained from both CAD and IRMPD. In all cases, EDD resulted in additional cross-ring cleavages. In most cases, cross-ring fragmentation obtained by EDD is more extensive than that obtained from IRMPD or CAD. Our results also indicate that branching does not affect EDD fragmentation, contrary to what has been observed for electron capture dissociation (ECD).
Adamson
Julie T
JT
Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, USA.
Håkansson
Kristina
K
D002240:Carbohydrate Sequence; D004583:Electrons; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D019158:N-Acetylneuraminic Acid / Q000737:chemistry*; D009844:Oligosaccharides / Q000737:chemistry*; D011522:Protons; D017550:Spectroscopy, Fourier Transform Infrared; D053719:Tandem Mass Spectrometry
D009844:Oligosaccharides; D011522:Protons; D019158:N-Acetylneuraminic Acid