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Mild method for preparation of 4,4-dimethyloxazoline derivatives of polyunsaturated fatty acids for GC-MS.

Authors
  • 1
  • 1 A. V. Zhirmunsky Institute of Marine Biology, Russian Academy of the Sciences, Vladivostok, 690041, Russia. [email protected]
Type
Published Article
Journal
Lipids
1558-9307
Publication Date
Volume
46
Issue
5
Pages
463–467
Identifiers
DOI: 10.1007/s11745-011-3550-4
PMID: 21461869
Source
Medline
License
Unknown

Abstract

A mild and convenient method has been developed for preparing 4,4-dimethyloxazoline (DMOX) derivatives of fatty acids for GC-MS analysis. First, fatty acid methyl esters are converted to corresponding amides by incubation overnight at room temperature with 2-amino-2-methyl-1-propanol and a catalytic amount of sodium methoxide. The resulting 2-(methylpropanol) amides were isolated by partition between hexane-diethyl ether and water, and then converted to 4,4-dimethyloxazoline derivatives by treatment with trifluoroacetic anhydride under mild conditions (50 °C for 45 min). Structures of 2-methylpropanol amide and a DMOX derivative of oleic acid were confirmed by GC-MS. This method was applied to different FAME prepared from animal, plant or microbial lipids. The suggested method is most suitable for structure analysis of polyunsaturated fatty acids (PUFA) and for acids with double bonds in close to terminal positions. Application of the method is illustrated with spectra of the DMOX derivatives of 16:1(n-13), 24:5(n-6) and 24:6(n-3) acids.

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