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Investigation of some 2,3‐didehydro amino acids by fast ion bombardment, chemical ionization and mass‐selected collision‐induced dissociation mass spectrometry
Author(s) -
Hamdan M.,
Tarzia G.,
Balsamini C.,
Bedim A.
Publication year - 1992
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210271114
Subject(s) - mass spectrometry , protonation , chemistry , collision induced dissociation , ionization , dissociation (chemistry) , fast atom bombardment , molecule , ion , chemical ionization , mass spectrum , analytical chemistry (journal) , tandem mass spectrometry , organic chemistry , chromatography
Four 2,3‐didehydro amino acids were investigated by fast ion bombardment (FIB) and ammonia chemical ionization (NH 3 ‐CI) mass Spectrometry. The protonated molecules formed by the two techniques were mass selected and their respective collision‐induced dissociations (CIDs) in the translational energy range 5–200 eV (in the laboratory frame of reference) were investigated. No obvious quantitative differences between the FIB and NH 3 ‐CI mass spectra of the ( E )‐ and ( Z )‐isomers were observed. Different internal excitation of the protonated molecules formed by the two techniques and the role of CID data in clarifying this particular observation are discussed.