More Is Different: Experimental Results on the Effect of Biomolecules on the Dynamics of Hydration Water
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- 作者：Lucia Comez ; Laura Lupi ; Assunta Morresi ; Marco Paolantoni ; Paola Sassi ; Daniele Fioretto
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2013
- 出版时间：April 4, 2013
- 年：2013
- 卷：4
- 期：7
- 页码：1188-1192
- 全文大小：268K
- 年卷期：v.4,no.7(April 4, 2013)
- ISSN：1948-7185
文摘
Biological interfaces characterized by a complex mixture of hydrophobic, hydrophilic, or charged moieties interfere with the cooperative rearrangement of the hydrogen-bond network of water. In the present study, this solute-induced dynamical perturbation is investigated by extended frequency range depolarized light scattering experiments on an aqueous solution of a variety of systems of different nature and complexity such as small hydrophobic and hydrophilic molecules, amino acids, dipeptides, and proteins. Our results suggest that a reductionist approach is not adequate to describe the rearrangement of hydration water because a significant increase of the dynamical retardation and extension of the perturbation occurs when increasing the chemical complexity of the solute.