Viscosities of casein in dilute 0.1 mol/L NaOH solutions at different temperatures were carefully measured.The upward phenomena of the apparent viscosity of casein in NaOH solutions was attributed to the adsorption of the solute on the inner wall of the glass capillary

and a corrected viscosity equation was used to deal with the obtained viscosity data.Five viscosity parameters have been obtained to describe the state of casein molecules in the solution and on the interface.It seemed that the size of casein molecules in solution changed little with temperature

and the adsorption layer thickness varied regularly with the adsorption amount.