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Utility of nicotinoyl derivatives in structural studies of mono- and diacylglycerols by gas chromatography/mass spectrometry. Part 2

✍ Scribed by P. Zöllner; E. Lorbeer

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
485 KB
Volume
30
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

The positional isomers of mono[(Z)‐9‐octadecenoyl] glycerol, di[(Z)‐12‐octadecadienoyl] glycerol were derivatized with nicotinic acid chloride hydrochloride. The resulting nicotinoyl derivatives were examined by gas chromatography/mass spectrometry. In their electron impact mass spectra, each methylene group and double bond of the alkyl chain is reflected by a fragmentation pattern in the high mass region. This is caused by radical‐induced cleavage of the alkyl chains following random hydrogen abstraction by the pyridine nucleus. An accurate determination of double bond positions in mono‐ and diacylglycerols is possible by characteristic spacings between abundant diagnostic ions in this fragmentation pattern.

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