Gas-Phase Structure and Unimolecular Dissociation of Cysteine Sulfinyl Radical Ions

摘要

1. Location of charge plays a role in charge driven vs. radical driven fragmentation of cysteine sulfinyl radical ions 2. Protonation on nitrogen resulted in 62Da loss (CH_2SO) 3. Formation of glycl radical 4. Dominant 51Da product ion loss (H_3SO) when cystienyl sulfinyl radical ions are acetylated 5. Loss of H_3SO is sequential loss from the initial H_2O loss 6. Mobile proton, beta carbon proton, acetyl nitrogen hydrogen are involved in H_3SO loss