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Isobutane and ammonia chemical ionization mass spectrometry of sesquiterpene hydrocarbons
Author(s) -
Schultze W.,
Lange G.,
Schmaus G.
Publication year - 1992
Publication title -
flavour and fragrance journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 70
eISSN - 1099-1026
pISSN - 0882-5734
DOI - 10.1002/ffj.2730070202
Subject(s) - isobutane , chemistry , chemical ionization , sesquiterpene , mass spectrometry , mass spectrum , fragmentation (computing) , reagent , ammonia , ion , atmospheric pressure chemical ionization , ionization , analytical chemistry (journal) , electron ionization , organic chemistry , chromatography , operating system , computer science , catalysis
The mass spectral reactions of sesquiterpene hydrocarbons under the conditions of chemical ionization (CI) using isobutane and ammonia, respectively, as the reagent gases are investigated. With isobutane intense quasimolecular ions [M + 1] + are obtained. The molecular weight can be deduced unequivocally. The extent of fragmentation is different for the various compounds, permitting a certain structural classification within this group. Sesquiterpene alcohols and esters may yield similar spectra with isobutane impeding unequivocal classification of this compound class. With ammonia a typical set of ions [M + 1] + , [M + 18] + and [M + 35] + , respectively, is produced. According to their specific mass numbers these ions unambiguously characterize the class of the hydrocarbons. The molecular mass is obtained from the species [M + 1] + and/or [M + 18 + ].