Rheological measurements (shear stress and shear
rate) of the puree at various temperatures were done
in a rotational viscometer (Brookfield R/S–CC25 Rheometer,
Middleboro, MA, USA) equipped with a Coaxial
Cylinder Measuring Systems. Approximately 17 ml
of puree was placed in the concentric cylindrical cup.
The sample compartment was monitored at a constant
temperature using a water bath. The viscometer was
operated between 10 and 100 rpm and the shear stress
readings were obtained directly from the instrument.