3.5. Viscosity
Viscosity of the pectin extracted at different microwave energy
levels is shown in Fig. 5. Viscosity of 1 g/100 g pectin solution
ranged from 60.5 to 98.2 mPa s. Viscosity increased significantly
after 15 min of extraction at all the energy levels studied. The increase in viscosity was higher at the microwave energy of 660 W to
1000 W for 20 min. Viscosity of pectin decreased at 25 min at all
energy levels demonstrating the effect of temperature for long
heating periods