Interactions of L-Aspartic Acid with Aqueous Solution of 1,2-Propanediol at Different Temperatures: A Volumetric, Compressibility and Viscometric Approach

Abstract

The volumetric, acoustic and viscometric methods are used for investigating the interactions of L-aspartic acid (Asp) in aqueous solution of 1,2-propanediol (PD) over a temperature of (298.15, 303.15 and 308.15) K at atmospheric pressure. Using the experimental results, the apparent molar volume, V φ , limiting apparent molar volume, V 0 φ , the slope, S v , and partial molar volume of transfer, V 0 φ,tr, have been calculated from density data. The apparent molar isentropic compressibility, K φ , s , limiting apparent molar isentropic compressibility, K 0 φ,s , its slope, S k , and partial molar compressibility of transfer, K 0 φ,s, tr , have been calculated from speed of sound data. These values are also used for calculating the number of water molecules hydrated, n H , to the Asp. The viscosity data has also been used to determine relative viscosity η r , viscosity B-coefficients, temperature derivative of B-coefficients, dB/dT and viscosity B-coefficients of transfer, B tr . The calculated parameters have been discussed in terms of various solute-solute and solute-solvent interactions prevailing in these solutions. Further, a detailed insight into the physicochemical interactions between Asp and aqueous PD, e.g., ion-hydrophilic and hydrophilic-hydrophilic interactions along with the structure-making tendency have been retrieved through the perusal of these calculated parameters.

Different Physical Properties of Few Amino Acids for Five Different Temperatures in Aqueous Sodium Acetate Solution

“…On the other hand, the apparent molar volume increases with the increase of molality. Hedaoo et al, reported that the increased apparent molal compressibility was found to decrease with the creased concentrations of the amino acids in indicating a weak electrostatic force in the ionic environment leading to the electrostatic salvation of ions [10 The hydrophilic interaction leads to the negative values of molal ] editor@iaeme.com compressibility and apparent molar volume for both the amino acids L-leucine and L-glutamine [11]. The temperature has a very affective role on both these physical characteristics of the amino acids.…”