Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Densities for glycine, L-alanine, L-valine, and L-leucine [(0.05 to 0.30) m] in aqueous lactose solutions ranging from pure water to 6 mass% lactose were determined at T = (293.15, 298.15, 303.15, and 308.15) K. The density was used to compute apparent molar volume, partial molar volume at infinite dilution, and experimental slope were obtained and interpreted in terms of solute solvent and solute solute interactions. These data were used to calculate the temperature derivatives of the partial molar volume at infinite dilution. The partial molar volume of transfer from water to aqueous lactose solutions at infinite dilution has also been calculated. In addition to this, the linear correlation of partial molar volume at infinite dilution with number of carbon atoms in the alkyl chain of amino acids was utilized to determine the respective contributions of NH3+ COO- , and CH2 groups to partial molar volume at infinite dilution.