Viscosity of pre-foam protein solutions was measured on
a controlled stress rheometer (StressTech; Reologica Instruments
AB, Lund, Sweden) using cup and bob geometry (measuring system
CCE25) according to the method of Davis and Foegeding (2004).
After a pre-shear at 50 s1 for 30 s, viscosity was measured over
a range of shear rates (0.5 s1–225 s1). Therheological behavior of
protein solutions was described by a power law model as shown in
Equation