Solubility of proline-leucine dipeptide in water and in aqueous sodium chloride solutions from T = (288.15 to 313.15) K

被引：24

作者：

Lampreia, IMS ^{[1
]}

Magalhaes, SRJ ^{[1
]}

Rodrigues, SIM ^{[1
]}

Mendonça, AFSS ^{[1
]}

机构：

[1] Univ Lisbon, Fac Ciencias, Ctr Ciencias Mol & Mat, Dept Quim & Bioquim, P-1749016 Lisbon, Portugal

来源：

JOURNAL OF CHEMICAL THERMODYNAMICS | 2006年 / 38卷 / 03期

关键词：

density; solubility; salt effect; solute-solvent interactions; proline-leucine dipeptide; aqueous solutions;

D O I：

10.1016/j.jct.2005.05.009

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Solubility of proline-leucine dipeptide, in water and in aqueous sodium chloride solutions, was measured at T = (288.15, 298.15, 308.15 and 313.15) K as a function of electrolyte concentration m = (0.1, 0.25, 0.5, 0.75 and 1) mol . kg(-1) of water. Solubility data has been evaluated from density measurements using a vibrating tube densimeter. It has been observed that sodium chloride renders the dipeptide proline-leucine more soluble in water. Salting-in coefficients and standard free energies of transfer of proline-leucine, from water to aqueous sodium chloride solutions, have been calculated from the solubility data. Standard enthalpies and entropies of transfer have also been estimated and interpreted in terms of electrostatic and hydrophobic perturbed domains in the hydration shells of the dipeptide and of the cation and anion of the salt, as a function of temperature and salt concentration. (C) 2005 Elsevier Ltd. All rights reserved.

引用

页码：240 / 244

页数：5

共 26 条

[1] SALTING-OUT OF ALKANOLS BY INORGANIC ELECTROLYTES [J].