The Study of Intermolecular Interactions for dl-Alanine and Glycine in Aqueous l(+)-Arabinose Solutions at Different Temperatures and Ambient Pressure, Using the Volumetric Approach

Abstract

Density measurements are used to calculate the apparent molar volumes Vφ, limiting apparent molar volumes $$V_{\varphi }^{0}$$ , limiting apparent molar volumes of transfer, $$\Delta_{\text{t}} V_{\varphi }^{0}$$ , limiting apparent molar expansibilities, $$E_{\varphi }^{0}$$ , and hydration numbers nH, for dl-alanine and glycine in aqueous solutions of l(+)-arabinose at T = 293.15 to 313.15 K. To obtain the limiting apparent molar volume, the Vφ values are extrapolated to zero molality using the linear form of the Redlich–Meyer equation. Also, the limiting apparent molar volumes of transfer, $$\Delta_{\text{t}} V_{\varphi }^{0}$$ , for the amino acids, from water to aqueous l(+)-arabinose solutions, are calculated from the $$V_{\varphi }^{0}$$ values. The limiting apparent molar expansibility, $$E_{\varphi }^{0}$$ , values have been obtained from the first derivative of limiting apparent molar volumes with respect to temperature. Also the hydration number, nH, for both amino acids in the ternary solutions are estimated. Possible solute–solvent interactions in the studied ternary systems are discussed.