title: Liquid chromatography-electrospray mass spectrometry as a tool for the analysis of sulfated oligosaccharides from mucin glycoproteins.
abstract: An approach for analyzing sulfated oligosaccharide alditol mixtures by liquid chromatography-electrospray mass spectrometry (LC-ESI-MS) is described. Two columns, an amino-bonded column and a porous graphitized carbon column (PGC) were used. Oligosaccharides were eluted with linear gradients of acetonitrile and water, with 5 mM ammonium hydrogencarbonate or formate buffers at a basic pH. The methods were evaluated on a mixture of sulfated oligosaccharide alditols prepared from mucin glycoproteins from pig stomach. Results from LC-ESI-MS of the mixture were compared with the structural information obtained by high energy collision fragmentation using fast atom bombardment tandem mass spectrometry (FAB-MS-MS). The separation ability of the two columns was also tested using a more complex mixture of sulfated oligosaccharides from pig colon, where several isomers were detected. The potential use of in-source collision-induced dissociation (CID) to gain sequence information of sulfated oligosaccharides was also evaluated. The major fragment ions obtained by in-source CID of the trisaccharide Hex-3HexNAcol6-HexNAc6-SO3 were sufficient for assigning the oligosaccharide sequence and the position of the sulfate group within the monosaccharide moiety. The LC-ESI-MS approach should be a valuable tool for characterization of mucin glycosylation and alterations during pathological conditions.
authors.affiliation: Department of Medical Biochemistry, Göteborg University, Gothenburg, Sweden. kristina.thomsson@medkem.gu.se
authors.forename: K A
authors.initials: KA
authors.lastname: Thomsson
authors.forename: N G
authors.initials: NG
authors.lastname: Karlsson
authors.forename: G C
authors.initials: GC
authors.lastname: Hansson
mesh_terms: D000818:Animals; D002240:Carbohydrate Sequence; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006023:Glycoproteins / Q000737:chemistry*; D013058:Mass Spectrometry / Q000379:methods*; D008969:Molecular Sequence Data; D009077:Mucins / Q000737:chemistry*; D009844:Oligosaccharides / Q000032:analysis*; D013464:Sulfuric Acids / Q000737:chemistry; D013552:Swine
chemical_list: D006023:Glycoproteins; D009077:Mucins; D009844:Oligosaccharides; D013464:Sulfuric Acids