不飽和脂肪酸の異性化に関する研究 (第3報) : 熱異性化リノール酸メチルとリノレン酸メチルの赤外線吸収スペクトル定量

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Following to the previous reports in which the qualitative investigation on the thermal isomerization of methyl linoleate and methyl linolenate was carried out, the quantitative investigation was discussed in this paper. At first, pure isomers were prepared by following methods.<BR>Cis-isolated isomer was prepared by combining the urea complex method and the low temperature crystallization as previously reported. Cis-trans conjugated one was prepared by the alkali-isomerization of cis-isolated and then purified by the low temperature crystallization. Trans-isolated one was prepared by the isomerization of cis-isolated with selenium, and then purified by vacuum distillation and low temperature crystallization.<BR>Trans-trans conjugated one which is obtainable from castor oil as “von Mikusch Acid”, was prepared by the thermal isomerization of cis-trans conjugated and then purified by vacuum distillation and low temperature crystallization. The infrared absorption characteristics of these pure isomers were determined and the quantitative investigation on the thermal isomerization of methyl linoleate and methyl linolenate was carried out.
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