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Leucine and isoleucine in chemical ionization and plasma desorption mass spectrometry: A comparative study
Author(s) -
Bouchoux Guy,
Bourcier Sophie,
Hoppilliard Yannik,
Mauriac Christine
Publication year - 1993
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.1210281015
Subject(s) - chemistry , dissociation (chemistry) , mass spectrometry , ionization , ion , mass spectrum , collision induced dissociation , desorption , chemical ionization , analytical chemistry (journal) , kinetic energy , isoleucine , plasma , electron ionization , leucine , chromatography , tandem mass spectrometry , amino acid , organic chemistry , physics , adsorption , quantum mechanics , biochemistry
The NH 3 and CH 4 chemical ionization mass spectra of leucine and isoleucine are compared with their plasma desorption mass spectra. Mass‐analysed ion kinetic energy (MIKE) and collision‐induced dissociation (CID)/MIKE experiments are also presented and the mechanisms of the formation and dissociation of immonium ions [M – CO 2 H 2 ] + are discussed. A comparison between the various ionization techniques reveals that plasma desorption produces pseudo‐molecular ions whose internal energy lies between zero and 300 kJ mol −1 .