Interactions between several l-α-amino acids and potassium chloride in aqueous solutions at 298.15 K

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

“…These exothermic interparticle interactions comprise electrostatic attraction between opposite charged ions between K+ and carboxylate group (\ \COO − ) of amino acid as well as Cl − and ammonium group (\ \NH 3 + ) of amino acid. The data of Table 2 were used to determine the enthalpic interaction coefficient of heterogeneous pairs amino acid zwitterion -dissociated electrolyte, as in our previous reports [7,8], using the procedure of non-linear regression with Eq. (1) proposed by Desnoyers [15]:…”

“…The values of heterogeneous enthalpic interaction coefficients of the tested amino acids with potassium chloride (Table 3) were supplemented by data acquired and published previously by our group [5,7,8].…”

“…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. Interaction coefficients derived from a modified [9,10] McMillan-Mayer's theory [11] describe the thermodynamic effects of interaction between two molecules [12], occurring with the competitive participation of water molecules.…”

“…Interaction coefficients derived from a modified [9,10] McMillan-Mayer's theory [11] describe the thermodynamic effects of interaction between two molecules [12], occurring with the competitive participation of water molecules. Enthalpic coefficients [7] differentiate both the interactions occurring between amino acid zwitterions and dissociated potassium chloride, as well as the affinity of dissolved molecules for water, and thus the hydrophobic-hydrophilic character of amino acid side substituents [13].…”

Study of the interaction between ethanol and natural amino acids containing ionic side groups in water at T = 298.15 K

“…The complex structure of biomacromolecules poses difficulties in the interpretation of the processes, in which they participate. Therefore, simple model systems such as L-a-amino acids [1][2][3] or small peptides [4][5][6] are often used for such investigations. Moreover, every living organism contains a constant stock of free natural amino acids, which participate in life processes, interact with the components of intracellular and extracellular fluids.…”