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Default Glycan analysis: scope and limitations of different techniques--a case for integrated use of LC-MS(/MS) and NMR techniques.

Glycan analysis: scope and limitations of different techniques--a case for integrated use of LC-MS(/MS) and NMR techniques.

Related Articles Glycan analysis: scope and limitations of different techniques--a case for integrated use of LC-MS(/MS) and NMR techniques.

Anal Bioanal Chem. 2013 Sep;405(23):7291-305

Authors: Fellenberg M, Behnken HN, Nagel T, Wiegandt A, Baerenfaenger M, Meyer B

Abstract
The structure of glycans from glycoproteins is highly relevant for their function. We tightly integrate liquid chromatography-mass spectrometry (LC-MS), MS/MS, and nuclear magnetic resonance (NMR) data to achieve a complete characterization of even isobaric glycans differing in only one linkage position or in the substitution in one branch. As example, we analyzed ten desialylated underivatized glycans from bovine fibrinogen. The molecules were separated on a PGC column, and LC-MS data allowed an assignment of the compositions of the glycans. MS/MS data of the same glycans allowed elucidation of sequence and to some extent of branching and linkage. All MS/MS fragmentation methods led to multiple dissociations, resulting in several cases in ambiguous data. The MS/MS data were interpreted both by scientists and automatically by software, and the differential results are compared. Additional data from a tight integration of LC-MS and NMR data resulted in a complete structural characterization of the glycans. The acquisition of simple 1D (1)H NMR data led--in combination with LC-MS and MS/MS data--to an unambiguous assignment of the isobaric glycans. Compounds that were not separated in the chromatography could easily be assigned structurally by applying the 3D cross-correlation (3DCC) technology to arrive at NMR spectra of the pure components-without actually separating them. By applying LC-MS, MS/MS, 1D (1)H NMR, and 3DCC together, one can assign glycan structures from glycoconjugates with high confidence affording only 200 pmol of glycan material.


PMID: 23852147 [PubMed - indexed for MEDLINE]



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