Cryogenic Vibrational Spectroscopy Provides Unique Fingerprints for Glycan Identification

  • Chiara Masellis
  • Neelam Khanal
  • Michael Z. Kamrath
  • David E. Clemmer
  • Thomas R. Rizzo
Research Article

Abstract

The structural characterization of glycans by mass spectrometry is particularly challenging. This is because of the high degree of isomerism in which glycans of the same mass can differ in their stereochemistry, attachment points, and degree of branching. Here we show that the addition of cryogenic vibrational spectroscopy to mass and mobility measurements allows one to uniquely identify and characterize these complex biopolymers. We investigate six disaccharide isomers that differ in their stereochemistry, attachment point of the glycosidic bond, and monosaccharide content, and demonstrate that we can identify each one unambiguously. Even disaccharides that differ by a single stereogenic center or in the monosaccharide sequence order show distinct vibrational fingerprints that would clearly allow their identification in a mixture, which is not possible by ion mobility spectrometry/mass spectrometry alone. Moreover, this technique can be applied to larger glycans, which we demonstrate by distinguishing isomeric branched and linear pentasaccharides. The creation of a database containing mass, collision cross section, and vibrational fingerprint measurements for glycan standards should allow unambiguous identification and characterization of these biopolymers in mixtures, providing an enabling technology for all fields of glycoscience.

Graphical Abstract

Keywords

Cryogenic vibrational spectroscopy Mass spectrometry Ion mobility Glycans Glycan analysis 

Supplementary material

13361_2017_1728_MOESM1_ESM.docx (542 kb)
ESM 1(DOCX 542 kb)

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Copyright information

© American Society for Mass Spectrometry 2017

Authors and Affiliations

  • Chiara Masellis
    • 1
  • Neelam Khanal
    • 2
  • Michael Z. Kamrath
    • 1
    • 3
  • David E. Clemmer
    • 2
  • Thomas R. Rizzo
    • 1
  1. 1.Laboratoire de Chimie Physique MoléculaireÉcole Polytechnique Fédérale de LausanneLausanneSwitzerland
  2. 2.Department of ChemistryIndiana UniversityBloomingtonUSA
  3. 3.ThunSwitzerland

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