title: Analysis of a series of isomeric oligosaccharides by energy-resolved mass spectrometry: a challenge on homobranched trisaccharides.
abstract: Glycans exist as part of glycoproteins and glycolipids, which are involved in a variety of biological functions. The analysis of glycan structures, particularly that of structural isomers, is fundamentally important since isomeric glycans often show distinct functions; however, a method for their structural elucidation has not yet been established. Anomeric configurations, linkage positions and branching are the major factors in glycans and their alteration results in a large diversity of glycan structures. The analysis of vicinally substituted oligosaccharides is extremely difficult because the product ions formed in tandem mass spectrometry (MS/MS) often have the same m/z values. In our endeavor to address the issue, we analyzed a series of homo-substituted trisaccharides consisting only of glucose by collision-induced dissociation (CID), especially energy-resolved mass spectrometry (ERMS). It was found that these structurally related glycans could be distinguished by taking advantage of differences in their activation energies in ERMS.
authors.affiliation: Mitsubishi Kagaku Institute of Life Sciences (MITILS), Minamiooya 11, Machida-shi, Tokyo 194-8511 Japan.
authors.forename: Shusaku
authors.initials: S
authors.lastname: Daikoku
authors.forename: Göran
authors.initials: G
authors.lastname: Widmalm
authors.forename: Osamu
authors.initials: O
authors.lastname: Kanie
mesh_terms: D007536:Isomerism; D013058:Mass Spectrometry / Q000379:methods*; D008968:Molecular Conformation; D012964:Sodium / Q000737:chemistry; D014312:Trisaccharides / Q000737:chemistry*
chemical_list: D014312:Trisaccharides; D012964:Sodium