The rheological properties of fermented soy milk were
measured using a controlled-viscometer (Brookfield DV-II þ Pro
Viscometer). The temperature was kept constant at 4 C by using a
circulating bath and pump (Masterflex L/S model 77250-62,
ColeeParmer, USA). By using small device adapter, the fluid flow in
a dead zone and/or the formation of unstable flow was minimized.
Rheological measurement was performed as a shear rate sweep by
increasing the shear rate from 0 to 200 rpm. During measurements,
shear rate, shear stress, apparent viscosity and tork (%) values were
recorded. Experimental shear stress-shear rate measurements
were fitted to selected rheological models to assess the flow
behavior of the fermented soy milk. Three different rheological
models were applied; Power Law Model (Eq. (1)), Herschel Bulkley
model (Eq. (2)), and Vocadlo model (Eq. (3));