双层脂质膜的粘弹性弛豫。频率依赖性张力和膜粘度。
Viscoelastic relaxation of bilayer lipid membranes. Frequency-dependent tension and membrane viscosity.
作者信息
Crawford G E, Earnshaw J C
出版信息
Biophys J. 1987 Jul;52(1):87-94. doi: 10.1016/S0006-3495(87)83191-0.
Abstract
Photon correlation spectroscopy has been used to study capillary waves on black lipid membranes of glycerol monooleate at temperatures above the lipid transition. For the first time the tension and viscosity of solvent-free bilayers have been observed to display a frequency dependence. The variations of both parameters can be accounted for by a Maxwell viscoelastic fluid model having a relaxation time of 37 microseconds. The equilibrium (omega = 0) tension is compatible with literature values. The present results do not suffice to precisely define the specific molecular processes involved, but relaxation times similar to the present are associated with certain phenomena in phospholipid vesicles. Bilayers containing hydrocarbon solvent do not show such relaxation, presumably due to their weaker intermolecular interactions.
摘要
光子相关光谱法已被用于研究在高于脂质转变温度的单油酸甘油酯黑色脂质膜上的毛细波。首次观察到无溶剂双层膜的张力和粘度呈现频率依赖性。这两个参数的变化可以用一个弛豫时间为37微秒的麦克斯韦粘弹性流体模型来解释。平衡（ω = 0）张力与文献值相符。目前的结果不足以精确界定所涉及的具体分子过程，但与目前相似的弛豫时间与磷脂囊泡中的某些现象有关。含有烃类溶剂的双层膜没有显示出这种弛豫现象，大概是由于它们较弱的分子间相互作用。
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