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二棕榈酰磷脂酰胆碱双层膜的热致行为。对特定标记脂质的傅里叶变换红外光谱研究。

The thermotropic behavior of dipalmitoyl phosphatidylcholine bilayers. A Fourier transform infrared study of specifically labeled lipids.

作者信息

Cameron D G, Casal H L, Mantsch H H, Boulanger Y, Smith I C

出版信息

Biophys J. 1981 Jul;35(1):1-16. doi: 10.1016/S0006-3495(81)84769-8.

Abstract

Fourier transform infrared spectroscopy has been used to study the thermotropic behavior of hydrated multibilayers of specifically deuterated derivatives of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine. It is shown that throughout the gel phase there is little or no conformational disorder introduced into the acyl chains. The pretransition effect is greatest in the central segments of the acyl chains, demonstrating that the interchain interactions are more pronounced in this region than in the center of the bilayer and suggesting the presence, in the gel phase, of a "plateau" in the strength of the interchain interactions. As the temperature is reduced, the rate of rotation of the terminal methyl group decreases steadily; below 0 degree C the conformation is rigid on the infrared time scale.

摘要

傅里叶变换红外光谱已被用于研究1,2 - 二棕榈酰 - sn - 甘油 - 3 - 磷酸胆碱特定氘代衍生物的水合多层膜的热致行为。结果表明,在整个凝胶相中,酰基链几乎没有或没有引入构象无序。预转变效应在酰基链的中央部分最为显著,这表明链间相互作用在该区域比在双层膜中心更为明显,并暗示在凝胶相中链间相互作用强度存在一个“平台期”。随着温度降低,末端甲基的旋转速率稳步下降;在0摄氏度以下,在红外时间尺度上构象是刚性的。

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