Collisional activation spectra of [M + Li]⁺, [M + Na]⁺ and [M + K]⁺ ions formed by field desorption of some monosaccharides

Abstract

The collkional activation spectra of monosaccharide ions formed by [GI+, "a]' and [K]+ ion attachment under field desorption conditions are reported. It is shown that the elimination of the alkali ions is determined by the alkali ion affinities of the molecules (M) and competes with a fragmentation of M which is almost independent of the alkali ion attached. Correspondingly the alkali ion is predominantly retained in the fragment ions. The usefulness of this method for the differentiation of underhatized isomers is demonstrated.

Electrospray ionization multiple-stage tandem mass spectrometric analysis of diglycosyldiacylglycerol glycolipids from the bacteria Bacillus pumilus

“…13,14 However, this data does not essentially contain new evidence about either the saccharide residue, or about the glyceride group, although the basic structural composition has been reflected clearly from this data. At present, investigations of CID spectra of the alkali-metal cationized species obtained under field desorption (FD), 15,16 FAB 16,17 and ESI 18,19 conditions have shown a large number of structurally informative fragmentations both of the sugar rings and aglycone and also the dependence of these fragmentation patterns on the type of cationizing atom. One of the reasons for this dependence is the different relative stability of the alkali-cation complexes in the gas phase which follows the order S [ Fig.…”

Identification of stereoisomers of some hexoses by mass spectrometry using fast atom bombardment and mass ion kinetic energy

“…Variation in this temperature will result in lower reproducibility of the fragmentation abundances. An alternative approach for the identification of underivatized monosaccharides has been proposed by Rollgen et al (6). They induce the decomposition of the cationized molecular ions (M + cat)+, generated by FD by collision with a gas confined in a collision chamber located in the second field free area of a reversed geometry mass spectrometer, and analyze the fragmentations generated by scanning the electrostatic analyzer (MIKE/CID).…”

Effect of metal cationization on the collision‐induced decomposition of 2,3‐diphenylpropenoic acid derivatives

“…[1][2][3] undergo CID mainly by the elimination of H 2 0 and HC0,H resulting from protonation on the carboxyl group. Neutral mass-loss linkedscan spectra show that the elimination of H C 0 2 H also occurs in two steps by loss of H 2 0 followed by that CO.…”