Rehydration kinetics of thin layer-dried red Amaranth (Amaranthus tricolor L.) leaves

The rehydration behaviour of a thin layer dried red Amaranth leaves were studied at various temperatures 38 0C, 50 0C, 60 0C and 80 0C. Three types of pretreated samples were used for this rehydration process: normal, chlorinated and processed. Pretreated samples were dried at 50 0C, 60 0C and 80 0C temperature. The rehydration process of the dried red amaranth leaves were satisfactorily described by the Peleg's equation. According to the Peleg's equation rehydration temperature increases from 38 0C to 80 0C, then the rate of rehydration constant K1 significantly decreases and the capacity constant K2 varies with different temperatures of rehydration. The increase in rehydration ratio was significant only as temperature increased from 38 0C to 80 0C.