<論文>直鎖脂肪酸と不飽和脂肪酸の混合単分子膜(第 2 報) : シス形二重結合の位置の影響

概要

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In order to clarify the effect of the position of cis-double bond in the hydrocarbon chain on the mixed monolayer states, two straight-chain and three unsaturated-chain fatty acids were selected : myristic, stearic, petroselinic (cis-6-octadecenoic), oleic (cis-9-octadecenoic), and vaccenic (cis-11-octadecenoic) acid. The surface pressures of myristic/stearic, myristic/petroselinic, myristic/oleic, and myristic /vaccenic acid systems were measured at various compositions and temperatures. Mean molecular area-mole fraction curves, two-dimensional phase diagrams and apparent molar energy changes were evaluated. The results of our studies are described as follows : (1) the transition pressure of the myristic /unsaturated-chain fatty acid systems increased with the increase of mole fraction of the unsaturated fatty acids in the mixed monolayer. This result indicates that there are mutual interactions between two components in the mixed monolayer which are weaker than the interactions between the pure component molecules themselves.; (2) the area of unsaturated-chain fatty acids monolayer became more expanded with the displacement of the cis-double bond from the end to the head in the hydrocarbon chain.; (3) the energy change-composition curves had most steep gradient when the position of cis-double bond is middle in the hydrocarbon chain.
山口県立大学の論文
1999-03-25