title: Enhanced post-source decay and cross-ring fragmentation of oligosaccharides facilitated by conversion to amino derivatives.
abstract: Post-source decay (PSD) fragmentation of chemically or enzymatically produced aminoglycans has been evaluated through matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry. Conversion of native glycans to their respective aminoglycan derivatives improved detection sensitivity of the usual fragments and promoted cross-ring fragmentation of linear oligosaccharides, facilitating linkage recognition. The cross-ring fragmentations for both dextrin and dextran oligosaccharides were not limited to the reducing-end glucose moiety, as they were extended throughout the entire molecule. When the amino group was generated for N-glycans derived from three different glycoproteins, an enhancement of PSD was observed, without a significant extent of cross-ring fragmentation.
authors.affiliation: Department of Chemistry, Indiana University, Bloomington, IN 47405, USA.
authors.forename: Jan
authors.initials: J
authors.lastname: Muzikar
authors.forename: Yehia
authors.initials: Y
authors.lastname: Mechref
authors.forename: Yunping
authors.initials: Y
authors.lastname: Huang
authors.forename: Milos V
authors.initials: MV
authors.lastname: Novotny
mesh_terms: D000606:Amino Sugars / Q000138:chemical synthesis* / Q000737:chemistry*; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D006023:Glycoproteins / Q000737:chemistry; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009844:Oligosaccharides / Q000737:chemistry*; D012015:Reference Standards; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D000606:Amino Sugars; D006023:Glycoproteins; D009844:Oligosaccharides