Densities and solubilities of glycylglycine and glycyl-L-alanine in aqueous electrolyte solutions

被引：22

作者：

Breil, MP

Mollerup, JM

Rudolph, ESJ

Ottens, M

van der Wielen, LAM

机构：

[1] Tech Univ Denmark, Dept Chem Engn, Engn Res Ctr, IVC,SEP, DK-2800 Lyngby, Denmark

[2] Delft Univ Technol, Kluyver Lab Biotechnol, NL-2628 BC Delft, Netherlands

来源：

FLUID PHASE EQUILIBRIA | 2004年 / 215卷 / 02期

关键词：

glycylglycine; electrolyte solution; dipeptides; density; solubility;

D O I：

10.1016/j.fluid.2003.08.010

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Solubilities of glycylglycine and glycyl-L-alanine in aqueous electrolyte solutions containing 0-6 molal NaCl, 0-1 molal Na2SO4, and 0-1 molal (NH4)(2)SO4, have been determined experimentally at 298.15 K and atmospheric pressure. The solubility of glycylglycine and glycyl-L-alanine in pure water is 1.74 and 4.78 mol/kg of water, respectively. The solubility of glycylglycine in salt solutions of NaCl, Na2SO4, and (NH4)(2)SO4 show a moderate salting-in effect. The solubility of glycyl-L-alanine show a minor or no salting-in effect at low salt concentrations and a moderate salting-out effect at higher salt concentrations in NaCl and Na2SO4, and in (NH4)(2)SO4 the solubility is almost constant. The densities of the solutions have been determined experimentally, and the volume expansions by dissolving salt and dipeptide in water have been calculated. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：221 / 225

页数：5

共 26 条

[1] Determination of the activity coefficients of glycylglycine and glycyl-L-alanine in sodium chloride solutions by an electrochemical cell with ion-selective electrodes: experimental measurements and thermodynamic theory [J].