Apparent molar volume, isentropic compressibilities, viscosity B-coefficients and activation parameters of thiamine hydrochloride in aqueous solutions of saccharides at different temperatures

Abstract

In this paper, volumetric, ultrasonic and viscometric analysis of thiamine hydrochloride in aqueous and mixed aqueous solutions of saccharides such as (0.1 mol kg−1 D-(-)-fructose, 0.1 mol kg−1 D-(+)-maltose and 0.1 mol kg−1 sucrose) over the temperature range (293.15–318.15) K and pressure, p = 101.3 kPa have been carried out. These have assisted in understanding the solute–solute, solute–solvent and solute–solvent interactions prevailing in the considered system. From the density data, the parameters like the apparent molar volume (Vϕ), limiting apparent molar volume (V0ϕ) and limiting apparent molar volume of transfer (ΔtrV0ϕ) have been computed. From the ultrasonic studies, the apparent molar isentropic compression (Kϕ,s), limiting apparent molar isentropic compression(K0ϕ,s) and limiting apparent molar isentropic compression of transfer (ΔtrK0ϕ,s) have been assessed. The Kϕ,s values are negative and that of ΔtrK0ϕ,s values are positive for thiamine hydrochloride in mixed aqueous 0.1 mol kg−1 systems of fructose/maltose/sucrose. From viscosity data, Falkenhagen A-coefficients and viscosity B-coefficients have been evaluated by employing the Jones-Dole equation. The Hepler’s constant (∂2V0ϕ/∂T2), limiting apparent molar expansibility (E0ϕ), thermal expansion coefficient (α), solvation number (Sn), activation parameters related to viscous flow (Δμ01, Δμ02, TΔS02 and ΔH02) etc. have also been estimated. By examining these results, we procured that the thiamine hydrochloride behaves as a structure breaker in aqueous and mixed aqueous solutions of saccharides.