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Why Are B ions stable species in peptide spectra?
Protonated amino acids and derivatives RCH(NH2)C(+O)X · H+ (X = OH, NH2, OCH3) do not form stable acylium ions on loss of HX, but rather the acylium ion eliminates CO to form the immonium ion RCH =Expand
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The gas‐phase basicities and proton affinities of amino acids and peptides
The methods of establishing gas-phase basicities and proton affinities are reviewed, particularly as applied to thermally labile and involatile molecules. The literature on the basicities of aminoExpand
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Fragmentation reactions of protonated peptides containing glutamine or glutamic acid.
  • A. G. Harrison
  • Chemistry, Medicine
  • Journal of mass spectrometry : JMS
  • 1 February 2003
A variety of protonated dipeptides and tripeptides containing glutamic acid or glutamine were prepared by electrospray ionization or by fast atom bombardment ionization and their fragmentationExpand
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Towards Understanding the Tandem Mass Spectra of Protonated Oligopeptides. 2: The Proline Effect in Collision-Induced Dissociation of Protonated Ala-Ala-Xxx-Pro-Ala (Xxx = Ala, Ser, Leu, Val, Phe,
The product ion spectra of proline-containing peptides are commonly dominated by yn ions generated by cleavage at the N-terminal side of proline residues. This proline effect is investigated in theExpand
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The structure and fragmentation of Bn (n≥3) ions in peptide spectra
The unimolecular and low energy collision-induced fragmentation reactions of the MH+ ions of N-acetyl-tri-alanine, N-acetyl-tri-alanine methyl ester, N-acetyl-tetra-alanine, tetra-alanine,Expand
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Scrambling of sequence information in collision-induced dissociation of peptides.
Collision-induced dissociation (CID) of protonated YAGFL-NH2 leads to nondirect sequence fragment ions that cannot directly be derived from the primary peptide structure. Experimental and theoreticalExpand
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Fragmentation reactions of protonated α-amino acids
The metastable ion fragmentation reactions of protonated α-amino acids were recorded. In addition, the low-energy collision-induced dissociation (CID) reactions were studied as a function ofExpand
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To b or not to b: the ongoing saga of peptide b ions.
Modern soft ionization techniques readily produce protonated or multiply protonated peptides. Collision-induced dissociation (CID) of these protonated species is often used as a method to obtainExpand
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