Two drying methods were studied: freeze drying was conducted at -40 °C for 14 hr and the three conditions for tray drying were 50 °C for 5.5 hr, 60 °C for 4.5 hr and 70 °C for 2 hr.
Two dryingmethods were studied: freeze drying was conducted at -40 °C for 14 hr and the three conditions fortray drying were 50 °C for 5.5 hr, 60 °C for 4.5 hr and 70 °C for 2 hr.