Mass spectrometric study of modified uridines and N3-β-D-ribofuranosyluracils

The mass spectral fragmentations of modified uridines as well as their isomeric N3-β-D-ribofuranosyluracils (N3-isomers of uridines) have been studied. The uncommon ions [b + 41 ]+; [b + 56]+ and [b + 68]+ were found in the mass spectra of the investigated compounds, and the differences in their relative intensities may be used for differentiating both isomers of modified uridines. The mechanism of the [b + 41] +ions formations is discussed.

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