Abstract
By using electrospray ionization mass spectrometry, it was found that larger alkali metal cations (K+, Rb+, Cs+) favor formation of mixed tetramer GCGC. This tetramer, cationized by these cations (ions [2C+2G+K]+, [2C+2G+Rb]+ and [2C+2G+Cs]+), was more abundant than other tetramers cationized by these cations (e.g. [2C+2G+K]+>[C+3G+K]+). The observed influence of K+, Rb+ and Cs+ on mixed GCGC tetramer is different from their influence on mixed dimer GC, since K+, Rb+ and Cs+ disfavor formation of mixed dimer GC (e.g. [2C+Rb]+>[C+G+Rb]+<[2G+Rb]+). As demonstrated by CID MS/MS spectra, gas phase decomposition of cationized GCGC is dominated by loss of cytidine molecule.
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