Egg yolk viscosity
The dynamic viscosity of fresh egg yolks was measured with a RS150 RheoStress rheometer (Haake, N.J., U.S.A.) coupled with a TC81 Peltier thermal controller. Careful separation of egg yolk from the white was done to not break the yolk membrane. The yolk was rolled in a filter paper to remove any remaining albumen. Approximately 10 drops of well-mixed egg yolk were used for each measurement. A parallel plate sensor with 33-mm diameter was used. Samples were placed between the plate and attachment (PP35T) with a gap of 1.0 mm. The temperature was maintained
at 23 ◦C. At the selected shear rate of 60 s−1 , apparent viscosity
of the yolk was measured. Duplicate measurements were done for each yolk sample.