Exploration of Diverse Interactions of Some Vitamins in Aqueous Mixtures of Cysteine

Abstract

The apparent molar volume (Φ_V), viscosity B-coefficient, molal refraction (R) and adiabatic compressibility (Φ_K) of Nicotinic Acid, Ascorbic Acid, and Folic Acid have been determined in 0.01, 0.03, 0.05 mol∙dm^-3 aqueous Cysteine solutions at 298.15 K from density (ρ), viscosity (η), refractive index (n_D) and speed of sound (u) respectively. The limiting apparent molar volumes (Φ⁰_V) and experimental slopes (S*_V), derived from the Masson equation, have been interpreted in terms of solute-solvent and solute-solute interactions respectively. The viscosity data were analyzed using the Jones-Dole equation and the derived parameters A and B have also been interpreted in terms of solute-solute and solute-solvent interactions respectively in the solutions. Using the Lorentz-Lorenz equation, molal refractions (R) have been calculated. At infinite dilution, limiting apparent molar adiabatic compressibilities (Φ⁰_K) of these vitamins were evaluated and discussed.