不飽和脂肪酸の異性化に関する研究 (第2報) : リノール酸メチル, リノレン酸メチルの熱異性化について

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Although it is known that the isolated double bond of unsaturated fatty acid is changed to the conjugated isomer by the action of heat, no investigation has been made in this process detail. The thermal isomerization of pure cis non-conjugated methyl linoleate and methyl linolenate was described in this paper. Almost pure cis non-conjugated methyl linoleate was obtained from methyl ester of cotton seed oil by combining the both of urea complex method and low temperature crystalization. Preparation of high purity isomer of methyl linolenate was reported in the previous report. The results of thermal isomerization of these pure isomers at 145, 190, 245 and 300°C, can be summerized as follows : <BR>1) Cis non-conjugated methyl linoleate forms trans-trans conjugated isomer and trans non-conjugated isomer at any temperature. The conjugated isomer is produced at the earlier stage even at relatively low temperature, and the trans non-conjugated accumulates as the isomerization proceeds.<BR>2) Methyl linolenate gives cis-trans conjugated isomer and trans non-conjugated isomer. However, cistrans conjugated isomer decreases and trans non-conjugated isomer accumulates as the isomerization proceeds.<BR>3) Against expectation that the methyl linolenate will be isomerized more easily to be conjugated isomer than methyl linoleate, the latter was more sensitive to thermal treatment even at relatively low temperature.
社団法人日本油化学会の論文