Thermophysical studies of protonated and deprotonated glycine in aqueous sodium acetate buffer solutions at different temperatures

Interactions of glycine in water and in (0.10, 0.50 and 1.00) aqueous sodium acetate buffer solutions of pH (1.00 and 12.40) have been investigated at different temperatures, T/K = (298.15-318.15). Densities,  and viscosities, of glycine in water and in aqueous sodium acetate buffer solutions have been measured. The obtained density data have been used to calculate apparent molar volume, , limiting partial molar volume, , limiting partial molar volumes of transfer, . Viscosity B-coefficient, viscosity B-coefficient of transfer, , Activation free energies per mole of the solute,  and solvent,  have been calculated from viscosity data. Further, second order derivative of partial molar expansion coefficient and dependence of coefficients on temperature is useful in measuring the structure making and breaking behavior of solute in these systems. Pair and triplet interaction coefficients for both the properties were also calculated. Thus, the results obtained from volumetric and viscometric studies are of considerable importance to identify different type of interactions (i.e. H-bonding, van der Waal’s interactions)in these systems

Thermophysical studies of protonated and deprotonated glycine in aqueous sodium acetate buffer solutions at different temperatures

1317-1328Interactions of glycine in water and in (0.10, 0.50 and 1.00) mol kg−1 aqueous sodium acetate buffer solutions of pH(1.00 and 12.40) have been investigated at different temperatures, T(K) = (298.15-318.15). Densities, and viscosities, of glycine in water and in aqueous sodium acetate buffer solutions have been measured. The obtained density data have been used to calculate apparent molar volume, , limiting partial molar volume, , limiting partial molar volumes of transfer,Δ. Viscosity B-coefficient, viscosity B-coefficient of transfer, Δ, activation free energies per mole of the solute,Δ2# and solvent, Δ1# have been calculated from viscosity data. Further, second order derivative of partial molarexpansion coefficient and dependence of coefficients on temperature is useful in measuring the structure making and breaking behaviour of solute in these systems. Pair and triplet interaction coefficients for both the properties were also calculated. Thus, the results obtained from volumetric and viscometric studies are of considerable importance to identify different type of interactions (i.e. H-bonding, van der Waals interactions) in these systems

Molecular interactions of glycine and L-alanine + citrate buffer solutions at different temperatures: Volumetric, viscometric, and FTIR approach

482-496Densities,, and viscosities,of glycine/L-alanine in water and in (0.10, 0.50, 1.00) mol∙kg−1 aqueous trisodium citratebuffer (Na3CB) solutions of pH 7.40 at T = (298.15 to 318.15) K have been measured by using vibrating tube digital density meter and suspended level Ubbelohde capillary viscometer, respectively, at atmospheric pressure i.e.101.3 kPa. Thermodynamic parameters, i.e., , Δ, viscosity B-coefficients, and Δ obtained from density and viscositymeasurements have been used to unravel predominant forces among glycine/L-alanine and aqueous Na3CB solutions. Activation free energies, Δ2# for the viscous flow of solutions, have been obtained by applying transition state theory to theviscosity B-coefficients values. The results are further supported by FTIR studies for glycine/L-alanine in water and aqueous Na3CB solutions of pH 7.40, revealing the intermolecular hydrogen bonding in these systems. Moreover, the results obtained from volumetric, viscometric, and spectroscopic studies provide valuable information on intermolecular interactions, influencing their efficacy in biological applications

Molecular interactions of glycine and L-alanine + citrate buffer solutions at different temperatures: Volumetric, viscometric, and FTIR approach

Densities,, and viscosities,of glycine/L-alanine in water and in (0.10, 0.50, 1.00)  aqueous trisodium citrate buffer (Na3CB) solutions of pH 7.40 at T = (298.15 to 318.15) K have been measured by using vibrating tube digital density meter and suspended level Ubbelohde capillary viscometer, respectively, at atmospheric pressure i.e.101.3 kPa. Thermodynamic parameters, i.e., , , viscosity B-coefficients, and  obtained from density and viscosity measurements have been used to unravel predominant forces among glycine/L-alanine and aqueous Na3CB solutions. Activation free energies,  for the viscous flow of solutions, have been obtained by applying transition state theory to the viscosity B-coefficients values. The results are further supported by FTIR studies for glycine/L-alanine in water and aqueous Na3CB solutions of pH 7.40, revealing the intermolecular hydrogen bonding in these systems. Moreover, the results obtained from volumetric, viscometric, and spectroscopic studies provide valuable information on intermolecular interactions, influencing their efficacy in biological applications