studies on the Mass spectrometry of Natural Products Ⅷ.FABMS and MIKEs of sodium Adduct Ions of Cynatratosides

The fast atom bombardment mass spectra (FABMS)and mass-selected ion kinetic energy spectra (MIKES) of sodim adduct ions M+Na~+ of three cynatratosides have been studied. For these oligoglycoside, when sodium chloride was added to the matrix, an intense sodium adduct ion appeared(basic peak)in their FAB mass spectra, which was more abundant than the corresponding protonated molecular ionM+H~- and may give more definite information about molecular weight of the sample. The MIKES of these M+Na~+ ion provided a convenient way for sugar seqnence analysis of such glycosides.