On-line sheathless capillary electrophoresis/nanoelectrospray ionization-tandem mass spectrometry for the analysis of glycosaminoglycan oligosaccharides

Electrophoresis
Alina ZamfirJasna Peter-Katalinić

Abstract

A novel approach in glycosaminoglycomics, based on sheathless on-line capillary electrophoresis/nanoelectrospray ionization-quadrupole time of flight-mass spectrometry (CE/nanoESI-QTOF-MS) and tandem MS of extended chondroitin sulfate/dermatan (CS/DS) oligosaccharide chains is described. The methodology required the construction of a new sheathless CE/nanoESI-QTOF-MS configuration, its implementation and optimization for the high sensitivity analysis of CS/DS oligosaccharide mixtures from conditioned culture medium of decorin transfected human embryonic kidney (HEK) 293 cells. Under newly established sheathless on-line CE/(-)nanoESI conditions for glycosaminoglycan (GAG) ionization and MS detection, single CS/DS oligosaccharide components of extended chain length and increased sulfation degree were identified. Molecular ions corresponding to species carrying 5 and 6 negative charges could be generated for large GAG oligosaccharide species in the negative ion nanoESI-MS. The optimized on-line conditions enabled the detection of molecular ions assigned to oversulfated tetradeca-, octadeca-, and eicosasaccharide CS/DS molecules, which represent the category of largest sulfated GAG-derived oligosaccharides evidenced by CE/ESI-MS. B...Continue Reading

Citations

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