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Determination of double bond positions in polyunsaturated fatty acid methyl esters by combined gas chromatography-chemical ionization mass spectrometry

✍ Scribed by Toshio Ariga; Eiji Araki; Takeshi Murata

Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
418 KB
Volume
83
Category
Article
ISSN
0003-2697

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✦ Synopsis

Trimethylsilylated methyl esters of octadecadienoic, eicosadienoic, and octadecatrienoic acids, after stereospecific oxidation, were investigated by combined gas chromatography-chemical ionization mass spectrometry. Molecular weight could be determined by the ions at m/e(M -1)' and (M + 73)+ and the characteristic ions derived from the sequential elimination of trimethylsilanols from a protonated molecule MH+. The position of original double bonds could be deduced from the recognizable ions which were produced by the cleavage of carbon-carbon bonds between the two trimethylsilyl ethers. The mode of fragmentation was confirmed by the mass spectra of deuteriomethyl derivatives of linoleic acid.

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