Dielectric relaxation change of water upon phase transition of a lipid bilayer probed by terahertz time domain spectroscopy

被引：38

作者：

Choi, Da-Hye ^{[1
]}

Son, Heyjin ^{[1
]}

Jung, Seonghoon ^{[2
]}

Park, Jaehun ^{[2
]}

Park, Woong-Yang ^{[3
]}

Kwon, Oh Sang ^{[4
]}

Park, Gun-Sik ^{[1
]}

机构：

[1] Seoul Natl Univ, Dept Phys & Astron, Ctr THz Bio Applicat Syst, Seoul 151747, South Korea

[2] POSTECH San 31, Pohang Accelerator Lab, Pohang 790784, South Korea

[3] Seoul Natl Univ, Coll Med, Dept Biomed Sci, Seoul 151747, South Korea

[4] Seoul Natl Univ, Coll Med, Dept Dermatol, Seoul 151747, South Korea

来源：

JOURNAL OF CHEMICAL PHYSICS | 2012年 / 137卷 / 17期

基金：

新加坡国家研究基金会;

关键词：

absorption coefficients; biochemistry; dielectric relaxation; lipid bilayers; organic compounds; terahertz spectroscopy; time-domain analysis; INFRARED-SPECTROSCOPY; NEUTRON-SCATTERING; LIQUID-WATER; DYNAMICS; MEMBRANES; HYDRATION; SIMULATION; MODEL; TEMPERATURES;

D O I：

10.1063/1.4764304

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We investigate the influence of the 1, 2-ditetradecanoyl-sn-glycero-3-phosphocholine lipid bilayer phases on the water reorientation dynamics with terahertz time domain spectroscopy. The phase of the lipids was controlled by the temperature in the range of 14-35 degrees C. During the gel-to-fluid phase transition, the hydration water ratio drastically changed from 0.3 to 0.6. The absorption coefficient of the hydration water increased with the temperature in the gel phase and then decreased in the fluid phase. The dielectric relaxation time of the lipid solution decreased initially but then increased after the phase transition. This indicates that the hydration water reorientation dynamics are restricted by lipids and that this phenomenon is pronounced in a biologically relevant fluid phase. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4764304]

引用

页数：5

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