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气-水界面处的磷脂表面双层膜。I. 热力学性质。

Phospholipid surface bilayers at the air-water interface. I. Thermodynamic properties.

作者信息

Tajima K, Gershfeld N L

出版信息

Biophys J. 1985 Feb;47(2 Pt 1):203-9. doi: 10.1016/s0006-3495(85)83892-3.

Abstract

Dispersions of dimyristoylphosphatidylcholine (DMPC) in water spontaneously form a surface bilayer at the equilibrium air/water surface (Gershfeld, N. L., and K. Tajima, 1979, Nature [Lond.]. 279: 708-709). This phenomenon has now been demonstrated with dispersions of dioleoylphosphatidylcholine (DOPC), dipalmitoylphosphatidylcholine (DPPC), and with a mixture of DMPC and DOPC. Each of these dispersions forms a surface bilayer at a singularity in temperature that is a characteristic of the phospholipid. The surface bilayer formed by the lipid mixture is shown to have the same composition as the bulk liquid-crystal phase of the dispersion, and the surface components have identical partial molar entropies as the bulk lipid components. These properties indicate that the surface bilayer has the same structure as the bilayer in the liquid-crystal phase of the bulk dispersion.

摘要

二肉豆蔻酰磷脂酰胆碱(DMPC)在水中的分散体在平衡气/水表面会自发形成表面双层(Gershfeld,N. L.,和K. Tajima,1979,《自然》[伦敦]。279:708 - 709)。现在已经用二油酰磷脂酰胆碱(DOPC)、二棕榈酰磷脂酰胆碱(DPPC)的分散体以及DMPC和DOPC的混合物证明了这种现象。这些分散体中的每一种在一个温度奇点处都会形成表面双层,该温度奇点是磷脂的一个特征。由脂质混合物形成的表面双层显示出与分散体的本体液晶相具有相同的组成,并且表面组分与本体脂质组分具有相同的偏摩尔熵。这些性质表明表面双层与本体分散体液晶相中的双层具有相同的结构。

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