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Diagnostic positive and negative ion fast atom bombardment mass spectrometry of low‐molecular‐weight ammonium compounds of marine origin
Author(s) -
Larsen Charles,
Anthoni Uffe,
Christophersen Carsten,
Nielsen Per Halfdan
Publication year - 1988
Publication title -
biomedical and environmental mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0887-6134
DOI - 10.1002/bms.1200170307
Subject(s) - chemistry , fast atom bombardment , mass spectrum , fragmentation (computing) , tetramethylammonium , ion , mass spectrometry , polyatomic ion , analytical chemistry (journal) , ammonium , inorganic chemistry , chromatography , organic chemistry , computer science , operating system
Five ammonium compounds–betaine, taurine, homarine, trigonelline and tetramethylammonium chloride–were investigated by positive and negative ion fast atom bombardment (FAB) mass spectrometry. Observation of the parent cation [M + H] + together with series of clusters (e.g. [ n M + H] + , n = 2‐5) and fragmentation patterns in the positive FAB mode may be used diagnostically as a fingerprint of the compound. The shifts in mass and relative intensity by addition of trichloroacetic acid and metal salts offer corroborating information of the identity of a compound in a mixture. The FAB negative ion spectra were characterized by clusters incorporating the anion (e.g. [M + Cl] − ) but are generally less informative than the spectra obtained in the positive mode.