Premium
Positional and geometrical isomers of linoleic acid in partially hydrogenated oils
Author(s) -
Ratnayake W. M. N.,
Pelletier G.
Publication year - 1992
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02540557
Subject(s) - cis–trans isomerism , linoleic acid , trans fat , chemistry , structural isomer , stereochemistry , fatty acid , organic chemistry , biochemistry , saturated fat , cholesterol
The geometrical and positional isomers of linoleic acid of a partially hydrogenated canola oil‐based spread were isolated and identified. Through partial hydrazine reduction and mass spectral studies, cis ‐9, trans ‐13 octadecadienoic acid was identified as the major isomer. Other quantitatively important isomers characterized were cis ‐9, trans ‐12; trans ‐9, cis ‐12 and cis ‐9, cis ‐15. These four were also the major isomers in margarine based on common vegetable oils. A number of minor isomers were detected and some structures identified were trans ‐9, trans ‐12; trans ‐8, cis ‐12; trans ‐8, cis ‐13; cis ‐8, cis ‐13; trans ‐9, cis ‐15; trans ‐10, cis ‐15 and cis ‐9, cis ‐13. The proportions of the various isomers are given for some margarines in the Canadian retail market. The amounts of trans ‐9, trans ‐12 isomer in Canadian margarines were generally below 0.5% of the total fatty acids.