Abstract
The collisionally activated dissociation (CAD) spectra of the sodium adduct ions of several oligosaccharides were obtained and compared to CAD spectra of the protonated molecules. Isomeric lacto-N-fucopentose I and lacto-N-fucopentose II, stachyose and maltodecaose are discussed here. Both natriated and protonated molecules provide familiar oxonium ion series through bond scissions in the glycosidic linkages under 8 keV collisions with helium. Natriated adducts also undergo two-bond cross-ring cleavages analogous to those observed in the laser desorption mass spectra of oligosaccharides. The relative contributions of glycosidic and cross-ring ion series in the CAD spectra of sodium adducts of carbohydrates are dependent on and can be controlled by collision energies in the 1-8 keV range.
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