Letter: Matrix-assisted laser desorption/ionization and electrospray ionization mass spectrometry: sodium-cationized oligosaccharides do not exhibit “internal-residue loss” rearrangement

Eur. J. Mass Spectrom. 4, 417–420 (1998)
DOI: 10.1255/ejms.241

Letter: Matrix-assisted laser desorption/ionization and electrospray ionization mass spectrometry: sodium-cationized oligosaccharides do not exhibit “internal-residue loss” rearrangement

Vladimír Kovácik and Vladimír Pätoprstý
Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 842 38 Bratislava, Slovak Republic.
Vladimír Havlicek
Institute of Microbiology, Academy of Sciences of the Czech Republic, Videñská 1083, 142 20 Prague, Czech Republic.
Pavol Kovác
NIDDK, National Institute of Health, Bethesda, Maryland 20892, USA.

ABSTRACT:

A series of methylgalactotrioses, in which one or two residues were specifically deoxygenated and labeled with a fluorine atom in the C-3 position, were used as models for the study of “internal residue loss” (IRL) under the conditions of matrix-assisted laser desorption/ionization time-of-flight (MALDI- TOF) and electrospray ionization (ESI) techniques. Under the conditions of measurement of MALDI-TOF post-source decay and ESI in-source decay of methyl oligosaccharides, the IRL rearrangement of [M + Na]⁺ ions did not take place.

Keywords: Oligosaccharides, matrix-assisted laser desorption/ionization mass spectrometry, electrospray ionization, internal residue loss, sodium cationized ions.

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