Abstract
Laser-desorption Fourier transform mass spectrometry (LD-FTMS) was used to investigate and compare the fragmentation patterns of O 6-, 7- and 9-ethylguanines. LD-FTMS of all ethylguanine isomers studied here gave characteristic fragmentations in addition to pseudomolecular ions. These ethylguanine isomers lose ethylene leading to the formation of protonated guanine. O 6-Ethylguanine readily loses acetaldehyde from molecular and pseudomolecular ions, however, acetaldehyde elimination was not observed in the spectra of 7- and 9-ethylguanines. Ionized O 6- and 7-ethylguanines both lose methyl radicals whereas ionized 9-ethylguanine does not. Fragmentation pathways for formation of some of the distinguishing ions are proposed. Collision-induced dissociation was also carried out to identify some of the fragment ions.
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