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• W2043887276 abstract "In this paper, we demonstrate for the first time the formation of radical anionic peptides [M - 2H]*- through a one-electron transfer mechanism upon low-energy collision-induced dissociation (CID) of gas-phase singly charged [Mn(III)(salen)(M - 2H)]*- complex ions [where salen is N,N'-ethylenebis(salicylideneiminato) and M is an angiotensin III derivative]. The types of fragment ions formed from [M - 2H]*- share some similarities with those from the cationic radical peptides M*+ and [M + H]*2+, but differ significantly from those of the corresponding deprotonated peptides [M - H]-. Fragmentation of [M - 2H]*- radical anionic angiotensin III derivatives leads preferentially to product ions of side-chain cleavage of amino acid residues, z-type and minor x-type fragment ions, most of which are types rarely observed in low-energy CID spectra of deprotonated analogs. The degree of competitive dissociation of the complexes is highly dependent on the nature of the substituted salen derivatives. The yields of anionic peptide radicals were enhanced to the greatest extent when electron withdrawing groups were positioned at the 5 and 5' positions, but the effect was rather modest when such groups resided at the 3 and 3' positions. Substituting a cyclohexyl unit of a salen with phenyl or naphthyl moieties at the 8 and 8' positions also facilitated electron-transfer pathways." @default.
• W2043887276 created "2016-06-24" @default.
• W2043887276 creator A5009399781 @default.
• W2043887276 creator A5046831000 @default.
• W2043887276 date "2006-09-01" @default.
• W2043887276 modified "2023-10-10" @default.
• W2043887276 title "Formation of Anionic Peptide Radicals In Vacuo" @default.
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• W2043887276 doi "https://doi.org/10.1016/j.jasms.2006.05.008" @default.
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