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Field ionization mass spectrometry of long chain fatty methyl esters
Author(s) -
Rohwedder William K.
Publication year - 1971
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/bf02531173
Subject(s) - chemistry , mass spectrometry , mass spectrum , ion , analytical chemistry (journal) , field desorption , polyatomic ion , molecular mass , ion source , ionization , chemical ionization , mass , molecule , chromatography , organic chemistry , enzyme
Abstract Mass spectrometry is particularly useful for identifying lipid materials. One primary factor in the interpretation of mass spectra is the recording of the molecular ion peak giving the molecular weight of the compound. Regrettably many compounds, including hydroxy compounds, do not give significant molecular ion peaks; consequently their identification is difficult. A mass spectrometer equipped with a field ionization source produces a greatly different mass spectrum consisting almost entirely of the molecular ion peak. This new source was used to measure the mass spectra of methyl esters of saturated, unsaturated and hydroxy fatty acids. Saturated esters gave the molecular ion peak almost exclusively; unsaturated esters yielded molecular plus metastable ion peaks; whereas the hydroxy esters had molecular, M‐18, meaastable and fragment ion peaks.