Sun-drying |
Samples were exposed to sunlight for 1 week |
Shade-drying |
Samples were dried in room temperature at 22–25 °C and humidity levels between 30% and 50% for 1 week |
Microwave-drying |
Samples were put in a microwave dryer (Samsung, Seoul, Korea) at atmospheric pressure and 160 W power (three times, 2 min each time) |
Oven-drying |
Samples were put in an oven (Protech, Selangor, Malaysia) at 50 °C for 24 h |
Freeze-drying |
Samples were frozen at −80 °C for 48 h, and then put in a freeze-dryer (Labconco, Kansas City, MO, USA) for 24 h |