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Unit cell volume and liquid-phase immiscibility in oleate-stearate lipid mixtures

机译:油酸-硬脂酸酯脂质混合物中的单位细胞体积和液相不混溶

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摘要

The structural basis of immiscibility of stearic acid (SA) in two unsaturated lipids at room temperature was examined. A 5% SA mixture in octadec-9-enoic acid (OA) is cloudy; a 5% SA solution in the methyl ester of OA (MeOA) is fully miscible. At 10% SA in MeOA, a clear and immiscible phase formed. The composition of this immiscible phase however was not 10% SA, but 25% SA. Adding additional SA altered the amount of the second phase, not its stoichiometry. Molecular mechanics explains the molecular basis for the ratio of saturated and unsaturated lipids in the different phases. Packing order of lipids within a unit volume explains the discrete lipid composition ratio forming each of the observed miscible and immiscible phases. The smallest unit cell volume that explains the observed stoichiometry is a cube (not a sphere).
机译:考察了硬脂酸(SA)在室温下在两种不饱和脂质中不溶混的结构基础。十八烷基-烯酸(OA)中的5%SA混合物浑浊; OA甲酯(MeOA)中的5%SA溶液可以完全混溶。在MeOA中,SA含量为10%时,会形成澄清和不混溶的相。然而,该不混溶相的组成不是10%SA,而是25%SA。添加额外的SA改变了第二相的数量,而不是其化学计量。分子力学解释了不同相中饱和脂质和不饱和脂质之比的分子基础。单位体积内脂质的堆积顺序说明了形成每个观察到的可混溶和不可混溶相的离散脂质组成比。解释观察到的化学计量的最小单位晶胞体积是立方体(不是球体)。

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