s ¼ K ðy_Þh (1)
Where s is shear stress (Pa), K is the consistency index (Pa$sh), y is shear rate (s1) and h is the flow behavior index. Logarithms were taken for s and y and a plot of log s versus log y was constructed.
The resulting line yielded the magnitude of log K (intercept) and h (slope).
The viscosity at a shear rate of 116 s1 was reported. Frequency sweeps were conducted at angular frequencies between 0.1 and 15 rad s1, with a 200 mm gap. The elastic modulus (G0) and the viscous modulus (G00) of the samples were obtained using the Universal Analysis software.
2.3. Texture analysis of frozen yogurts Texture (as hardness) of the FYNRO, FYSC and PFY was determined
according to Soukoulis and Tzia (2008). For determination of hardness, samples were packaged in cups with 65 mm diameter and 30 mm height. Samples were then transferred from 22 C to 15 C and held for 24 h before analysis. A texture analyzer