The Development of Ginger Drying Using Tray Drying, Heat Pump-Dehumidified Drying, and Mixed-Mode Solar Drying

摘要

Mature ginger was pretreated by soaking in citric acid prior to drying in a single layer in a tray and heat pump dehumidified dryer at three temperatures of 40, SO, and 60° C and in a mixed-mode solar dryer at 62.82°C and a radiation intensity of 678 W/m2. The drying data were applied to the modified Page model. Diffusivities were also determined using the drying data. Quality evaluation by color values, reabsorption, and 6-gingerol content showed best quality for ginger with no predrying treatment and dried at 40° C in a heat pump-dehumidified dryer. At drying temperature of 60 to 62.82° C, no pretreated dried ginger from mixed-mode solar dryer provided the shortest drying time and retained 6-gingerol as high as heat pump-dehumidified dryer.