Eur. Phys. J. E (2019) 42: 139
https://doi.org/10.1140/epje/i2019-11901-1

Regular Article

Broadband dielectric spectroscopy from sub GHz to THz of hydrated lipid bilayer of DMPC

¹ Department of Chemistry, Graduate School of Science, Kobe University, 657-8501, Nada, Kobe, Japan
² Jichi Medical University, 3311-1 Yakushiji, 329-0498, Shimotsuke-shi, Tochigi-ken, Japan
³ Molecular Photoscience Research Center, Kobe University, 657-8501, Nada, Kobe, Japan

^* e-mail: tominaga@kobe-u.ac.jp

Received: 31 May 2019
Accepted: 8 October 2019
Published online: 30 October 2019

Abstract

In order to study the dynamics of a phospholipid and its hydration water, we measured complex dielectric spectra of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) from the sub-GHz to the THz frequency region with varying the temperature and hydration level of the sample. Spectra obtained from a vector network analyzer and two terahertz time-domain spectrometers are adjusted, which enables us to analyze the dielectric spectra from the sub-GHz region to the THz region by a model function. We confirmed a fast relaxational mode in the sub-THz region, which was suggested by the previous work which only used a THz spectrometer.