The combined method consists of a triple combination of the main drying techniques. Thus, in first stage the samples were dried in hot air convection at 60 °C, 180 min, followed by hot air ventilation at 40 °C simultaneous with microwave at different powers (105 W – 30 min, 210 W – 15 min and 315 W – 9 min). From the starting of the drying the change in the sample weight was recorded at the time intervals of 30 min for hot air drying and 3 min for microwave drying. The drying method labels for these set are (60 °C/C40 °C + MW105 W), (60 °C/C40 °C + MW1210 W), (60 °C/C40 °C + MW315 W).