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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 centtrans bonds as determined by infrared analysis.
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Litchfield et al. (1962) studied this question.
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