Analysis of the Viscosity-temperature-concentration Dependence for Dimeric Bovine Β-lactoglobulin Aqueous Solutions on the Basis of the Vogel-tammann-fulcher’s Equation

The paper presents the results of viscosity determinations on aqueous solutions of bovine β-lactoglobulin at a wide range of concentrations and at temperatures ranging from 278 K to 328 K. The solutions viscosity has been measured by using an Ubbelohdetype capillary microviscometer. The viscosity-temperature dependence, at each fixed concentration, has been quantitatively described by the three parameters Vogel-Tammann-Fulcher’s equation. A way of calculations of the parameters, based on the least square method, has been presented. The obtained expressions allow calculation of the parameters, if the experimental values of viscosity and temperature are given. The physical meaning and the concentration dependence of those parameters is discussed too. Temperature dependence of the activation energy of viscous flow and the effective specific volume of the studied protein has been demonstrated.