The drying experiments were conducted at 50 c using a hot air drying chamber. The fresh or preheated samples were placed on a rectangular wire mesh fixed at a height of 26 cm in the chamber. The air velocity during was 0.19-0.028 m/s. The drying tests were performed for 5 h. The drying was considered to be complete after 5 h when the weight difference between two successive measurement per 1 h was less than 0.03 mg