リノレン酸メチルの水素添加経過および核磁気共鳴スペクトル法によるイソリノール酸メチルの定量

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The hydrogenation of methyl linolenate was carried out in the presence of nickl catalyst at 180°C under a hydrogen pressure of 1 atm and also in the presence of platinum catalyst at 20°C under hydrogen pressures below 40mmHg. The hydrogenation products taken at different stages of reaction were analyzed by spectroscopic and gas chromatographic procedures. The results showed that the amount of isolinoleates formed (i.e. isomers which are formed from methyl linolenate and which do not undergo isomerization upon treatment with alkali) was extremely greater than the total amount of methyl esters of conjugated and normal dienoic acids formed. From the fatty acid compositions of the products obtained employing two types of catalysts, it is considered that the hydrogenation with nickel catalyst is a selective reaction while the hydrogenation with platinum catalyst is a nonselective reaction.<BR>A new method involving nuclear magnetic resonance spectral analysis is proposed for the determination of isolinoleates. If the sample consists of unsaturated fatty acids alone, the amount of isolinoleates can readily be determined from the results of nuclear magnetic resonance spectral analysis. However, if the sample contains both saturated and unsaturated acids, the amounts of saturated acids must be determined by gas chromatography before isolinoleates determination.
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