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

Abstract

The apparent molar volume (<em>Φ<sub>V</sub></em>), viscosity B-coefficient, molal refraction (<em>R</em>) and adiabatic compressibility (<em>Φ<sub>K</sub></em>) of Nicotinic Acid, Ascorbic Acid, and Folic Acid have been determined in 0.01, 0.03, 0.05 mol∙dm<sup>-3</sup> aqueous Cysteine solutions at 298.15 K from density (<em>ρ</em>), viscosity (<em>η</em>), refractive index (<em><em>n<sub>D</sub></em></em>) and speed of sound (<em>u</em>) respectively. The limiting apparent molar volumes (<em>Φ<sup>0</sup><sub>V</sub></em>) and experimental slopes (<em>S*<sub>V</sub></em>), 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 <em>A</em> and <em>B</em> have also been interpreted in terms of solute-solute and solute-solvent interactions respectively in the solutions. Using the Lorentz-Lorenz equation, molal refractions (<em>R</em>) have been calculated. At infinite dilution, limiting apparent molar adiabatic compressibilities (<em>Φ<sup>0</sup><sub>K</sub></em>) of these vitamins were evaluated and discussed.