Surface properties of aqueous solutions of L-leucine

被引：103

作者：

Glinski, J

Chavepeyer, G

Platten, JK

机构：

[1] Univ Wroclaw, Fac Chem, PL-50383 Wroclaw, Poland

[2] Univ Mons, Fac Med & Pharm, B-7000 Mons, Belgium

来源：

BIOPHYSICAL CHEMISTRY | 2000年 / 84卷 / 02期

关键词：

air-liquid interface; surface tension; surface entropy; aqueous solutions; liquid structure; L-leucine;

D O I：

10.1016/S0301-4622(99)00150-7

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 [生物化学与分子生物学]; 081704 [应用化学];

摘要：

The surface tension, sigma, of solutions of L-leucine (CH3)(2)CHCH2CH(NH2)COOH in water, as well as in aqueous solutions of NaOH and HCl were measured in the temperature range between 278 and 308 K using the Wilhelmy plate method. L-Leucine was found to be a very weak surfactant, which can be understood if assuming strong interactions of this solute with the water structure. Striking differences were observed in the surface entropy of L-leucine solutions in water, 0.5 M HCl and 0.5 M NaOH. Moreover, surface activity of the solute is much lower than that supposed taking into account the hydrophobicity of this amino acid. It was concluded that the observed phenomena are caused by the water structure changes close to the side chain of leucine, caused by enforced hydrophobic hydration, i.e. formation of clathrate-like hydrates. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：99 / 103

页数：5

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