Studies on Volumetric and Viscometric Properties of L-glutamic Acid in Aqueous Solution of Glucose Over a Range of Temperatures (298K to 323K)

In this work, volumetric and viscometric properties of L-glutamic acid in water and aqueous glucose solutions (5%, 10%, 15%, and 20% of glucose, w/w in water) have been measured as a function of molal concentration (0.02 mol.kg^-1 to 0.16 mol.kg^-1) of L-glutamic acid at different temperatures T= (293.15, 303.15, 308.15, 313.15 and 323.15) K. By using experimental densities (ρ) and viscosities (η) data, apparent molar volume (φ_v), experimental slope (S_v), limiting apparent molar volume (φ_v⁰),limiting apparent molar volume transfer (Δφ_v⁰)tra, limiting apparent molar expansibilities (Eφ⁰), Hepler’s constant (δEφ⁰/δT)p, Falkenhagen coefficient A, and Jones-Dole coefficient B have been computed. Gibbs free energies of activation of viscous flow per mole of solvent (𝜇₁^0#) and per mole of solute (𝜇^0#),hydration number (H_n) is also calculated. The results are discussed based on solute-solute and solute-solvent interactions in these systems. From the results, it is observed that there exists a structure making propensity of L-glutamic acid in water and in the different mass fraction of aqueous glucose solutions, which increases with the increase of glucose concentrations.

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