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• W2011504052 abstract "The [M - H]- ions of a variety of di- to pentapeptides containing H or alkyl side chains have been prepared by electrospray ionization and low-energy collision-induced dissociation (CID) of the deprotonated species carried out in the interface region between the atmospheric pressure source and the quadrupole mass analyzer. Using the nomenclature applied to the fragmentation of protonated peptides, deprotonated dipeptides fragment to give a2 ions (CO2 loss) and y1 ions, where the y1 ion has two fewer hydrogens than the y1 ions formed from protonated peptides. Deprotonated tri- and tetrapeptides fragment to give primarily y1, c1, and b2 ions, where the b2 ion has two fewer hydrogens than the b2 ion observed for protonated peptides. More minor yields of y2, c2, and a2 ions also are observed. The a ion formed by loss of CO2 from the [M - H]- ion shows loss of the N-terminal residue for tripeptides and sequential loss of two amino acid residues from the N-terminus for tetrapeptides. The formation of c(n) ions and the sequential loss of N-terminus residues from the [M - H - CO2]- ion serves to sequence the peptide from the N-terminus, whereas the formation of y(n) ions serves to sequence the peptide from the C-terminus. It is concluded that low-energy CID of deprotonated peptides provides as much (or more) sequence information as does CID of protonated peptides, at least for those peptides containing H or alkyl side chains. Mechanistic aspects of the fragmentation reactions observed are discussed." @default.
• W2011504052 created "2016-06-24" @default.
• W2011504052 creator A5049513070 @default.
• W2011504052 date "2001-01-01" @default.
• W2011504052 modified "2023-10-17" @default.
• W2011504052 title "Sequence-specific fragmentation of deprotonated peptides containing H or alkyl side chains" @default.
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• W2011504052 doi "https://doi.org/10.1016/s1044-0305(00)00199-9" @default.
• W2011504052 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11142353" @default.
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