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首页> 外文期刊>Biophysical Chemistry: An International Journal Devoted to the Physical Chemistry of Biological Phenomena >Hydrophobic thickness of fluid planar monooleylglycerol membranes maximally thinned by inversed micellisation
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Hydrophobic thickness of fluid planar monooleylglycerol membranes maximally thinned by inversed micellisation

机译：反向胶束化可使平面状单油基甘油甘油膜的疏水厚度最大程度地变薄

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摘要

A procedure of making membranes of amphiphilic materials at the bottom of a U-shaped flexible plastic tube within an aqueous medium is described. The membranes were made sufficiently large in order for the annulus area to be neglected. Consequently the hydrophobic thickness of the membrane could be measured by a capacitance technique assuming the relative permittivity of the hydrophobic part of the bilayer. Introduction of an AC microvolt technique allowed manufacture of stable thick membranes by quenching the electroconstriction observed when DC electrical potentials in the millivolt range are used. By continuously monitoring the hydrophobic thickness and by use of the AC microvolt technique the membrane-thinning process by chemical means could be studied in isolation because the electroconstriction was quenched. The maximally thinned hydrophobic thickness of a monooleylglycerol membrane measured at 38 deg C was found to be 25+-1.2 Anstrom. Criteria and argumentation for maximal thinning of the membrane are put forward. A distinction between genuine and modified cholesterol was demonstrated to be possible by the described method.
机译：描述了在水性介质内的U形柔性塑料管的底部制造两亲性材料的膜的过程。使膜足够大以便忽略环面面积。因此，可以通过假设双层的疏水部分的相对介电常数的电容技术来测量膜的疏水厚度。交流微伏技术的引入允许通过淬灭在使用毫伏范围内的直流电势时观察到的电致伸缩来制造稳定的厚膜。通过连续监测疏水性厚度并使用交流微伏技术，由于电致伸缩被淬灭，因此可以单独研究通过化学方法进行的薄膜稀释过程。发现在38℃下测得的单油基甘油膜的最大减薄的疏水厚度为25±1.2安斯特伦。提出了最大减薄膜的标准和论据。通过所描述的方法证明了在真实的胆固醇和修饰的胆固醇之间进行区分是可能的。

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