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Analysis of the geometric isomers of methyl linoleate by gas chromatography
Author(s) -
Litchfield Carter,
Isbell A. F.,
Reiser Raymond
Publication year - 1962
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/bf02638797
Subject(s) - cis–trans isomerism , chemistry , gas chromatography , elution , structural isomer , chromatography , stereochemistry
The four geometric isomers of methyl linoleate have been quantitatively determined by gas chromatography on Apiezon L and DEGS polyester capillary columns. Three peaks were eluted from the Apiezon L column: (a) the 9‐ cis , 12‐ cis isomer; (b) the 9‐ cis , 12‐ trans isomer; and (c) the 9‐ trans , 12‐ cis and 9‐ trans , 12‐ trans isomers combined. The DEGS polyester column also resolved three peaks: (a) the 9‐ trans , 12‐ trans isomer; (b) the 9‐ cis , 12‐ cis and 9‐ cis , 12‐ trans isomers combined; and (c) the 9‐ trans , 12‐ cis isomer. Since the separation of isomers was different on each column, the content of each of the four isomers could be determined from the combined results. Quantitative results agreed closely with the per cent trans bonds as determined by infrared analysis.