Electron transfer dissociation peptide charge state

Liu, J. Huang, T.Y. McLuckey, S.A. Charge state dependence of proton transfer versus electron transfer in a gas-phase ion/ion electron transfer dissociation process on tryptic peptides. Proc. 56th ASMS Conference on Mass Spectrometry and Allied Topics, Denver, CO, June 1, 2008. 

Mote recently, ETD, a dissociation technique very similar to ECD, was introduced for peptide/protein sequencing [56-58]. In ETD, multiply-chaiged cations react with an anion radical (A, e.g., SO2, SFg", anthracene, fluoranthene), leading to electron transfer and the generation of both odd- and even-electron fragments and molecular species with lower charge states as follows ... 

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