Mass Spectrometry of 4,4-Dimethyloxazoline
(DMOX) Derivatives of Fatty Acids
4,4-Dimethyloxazoline (DMOX) derivatives give excellent mass spectra of fatty acids with electron-impact ionization that often permit unequivocal identification. The gas chromatographic properties of DMOX derivatives are better than those of other nitrogen-containing derivatives, and many analysts consider them the best single derivative available for identification of fatty acids. However, when there are functional groups near the terminal end of the molecule, problems arise. One further drawback is that DMOX derivatives are not very stable chemically, as ring opening occurs rapidly on storage in the presence of traces of moisture (see our web page on preparation of derivatives). However, if analysts are aware of potential pitfalls, these difficulties can be overcome with assistance from the documents in this section of the website. Some of the following web documents also discuss the spectra of analogous pyrrolidide derivatives because of similarities in the fragmentation patterns. These web pages are updated regularly as new information and mass spectra become available.
DMOX derivatives of mainstream fatty acids
DMOX derivatives of some less common fatty acids
Archive - DMOX derivatives of fatty acids
We have approximately 340 mass spectra of DMOX derivatives of different fatty acids available for examination here, but without interpretation. They were collected from our research efforts over more than 30 years.
Literature survey - DMOX derivatives of fatty acids
Recommended Book: Christie, W.W. and Han, X. Lipid Analysis - Isolation, Separation, Identification and Lipidomic Analysis (17th edition), 446 pages (Oily Press, Woodhead Publishing and now Elsevier) (2010) - at Science Direct.
|Credits/disclaimer/contact||Updated: July 4th, 2021||Author: William W. Christie|