Probing Intermolecular Interactions in Phospholipid Bilayers by Far-Infrared Spectroscopy
详细信息 查看全文
- 作者：Giovanna D’AngeloValeria Conti Nibali ; Cristina Crupi ; Simona Rifici ; Ulderico Wanderlingh ; Alessandro Paciaroni ; Francesco Sacchetti ; Caterina Branca
- 刊名：Journal of Physical Chemistry B
- 出版年：2017
- 出版时间：February 16, 2017
- 年：2017
- 卷：121
- 期：6
- 页码：1204-1210
- 全文大小：414K
- ISSN：1520-5207
文摘
Fast thermal fluctuations and low frequency phonon modes are thought to play a part in the dynamic mechanisms of many important biological functions in cell membranes. Here we report a detailed far-infrared study of the molecular subpicosecond motions of phospholipid bilayers at various hydrations. We show that these systems sustain several low frequency collective modes and deduce that they arise from vibrations of different lipids interacting through intermolecular van der Waals forces. Furthermore, we observe that the low frequency vibrations of lipid membrane have strong similarities with the subpicosecond motions of liquid water and suggest that resonance mechanisms are an important element to the dynamics coupling between membranes and their hydration water.