Enthalpic Interaction Coefficients of Several l-α-Amino Acids in Aqueous Sodium Chloride Solutions at 298.15 K

Abstract

The enthalpies of solution of L-R-isoleucine, L-R-cysteine, L-R-aspartic acid, and L-R-glutamic acid have been measured in aqueous sodium chloride solutions at 298.15 K. From the obtained experimental results the standard dissolution enthalpies of amino acids in aqueous NaCl solutions have been determined. These data were used to calculate of the heterogeneous enthalpic pair interaction coefficients based on McMillan-Mayer's theory. These values were interpreted in the terms of the hydrophobic or hydrophilic effects of the side chains of amino acids on their interactions with dissociated sodium chloride in water.

Calorimetric Studies of the Interactions between Several Aminophosphonic Acids and Urea in Aqueous Solutions at 298.15 K

“…Our laboratory has long carried out studies on the interactions of l -α-amino acids with the components of body fluids, among other things, urea. − As aminophosphonic acids are disseminated in the environment, it is of interest to assess their interactions with urea occurring in vertebrate organisms as a component of the urea cycle. In the industry, urea is used as an additive to cosmetics and occurs in animal foodstuff, it is a component of many chemical fertilizers.…”

Enthalpic Pairwise Interactions of <em>&alpha;</em>-Aminobutyric Acid Enantiomers in DMF+Water Mixtures

“…[3][4][5] 焓对作 用系数被认为是溶液中溶剂介入的溶质-溶质相互 作用焓效应的一种有效度量. 6,7 Castronuovo 等 8 通过 对一系列二元烷醇在乙醇+水混合溶剂中同系焓对 作用系数的测定, 考察了共溶剂的存在对疏水作用 的影响. Palecz 9,10 通过对一系列 L-α-氨基酸同系和 交叉焓对作用的研究, 建立了一种描述氨基酸疏水 性的热力学尺度.…”

Effects of l-α-amino acids side chains on their interparticle interactions with the dissociated potassium chloride in aqueous solutions

“…The aim of this work, which is a continuation of studies regarding the interactions between the natural amino acids and ions [5][6][7], is the determination of the interaction effects between the selected zwitterions of encoded L-α-amino acids with dissociated potassium chloride in aqueous solutions with particular focus on the effects of the amino acid side chains on these interactions. The obtained results of calorimetric enthalpy measurements of dissolution of L-α-amino acids in aqueous solutions of potassium chloride were used to calculate the heterogeneous enthalpic pair interaction coefficients [7,8] between amino acid zwitterions and dissociated potassium chloride.…”