期刊
JOURNAL OF CHEMICAL PHYSICS
卷 137, 期 17, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4764304
关键词
absorption coefficients; biochemistry; dielectric relaxation; lipid bilayers; organic compounds; terahertz spectroscopy; time-domain analysis
资金
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) [2009-0083512, 2011-0001291]
- POSTECH
- National Research Foundation of Korea [2009-0093427, 2012-90001865] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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]
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