Jian Fuji, Divagar Darsana, Mhaiki Jennifer, Jayas Digvir S, Fields Paul G, White Noel D G
Department of Biosystems Engineering University of Manitoba Winnipeg MB Canada.
Morden Research and Development Centre, Agriculture and Agri-Food Canada c/o Department of Biosystems Engineering University of Manitoba Winnipeg MB Canada.
Food Sci Nutr. 2018 Jul 20;6(6):1629-1640. doi: 10.1002/fsn3.744. eCollection 2018 Sep.
Adsorption and desorption isotherms of hemp seeds with 0%, 5%, 10%, 15%, and 20% of dockage were determined using the salt solution static (SSS) method. The wet hemp seeds with 0% dockage were also dried at 30℃ with 50% RH, 35℃ with 30% and 50% RH, and 40℃ with 30% and 50% RH inside a thin-layer dryer (thin-layer dynamic method). The hemp seeds with different percentages of dockage showed hysteresis, and this hysteresis became more obvious with the decrease of temperature. At the same condition, the equilibrium moisture content of hemp seeds with 0% dockage was approximately 0.5 percent points lower than that of the hemp seeds with dockage. The best equation to fit the equilibrium moisture content data under constant temperature and RH was the modified GAB equation for both adsorption and desorption isotherms. The constant rate period of drying was observed for <0.75 hr when drying air RH was 30% or when drying air temperature was 40℃. The Henderson and Pabis model was the best model to fit the thin-layer drying data. The equilibrium moisture contents measured by the SSS method were lower than those measured by the thin-layer dynamic method when temperature was ≤35℃.
采用盐溶液静态（SSS）法测定了杂质含量分别为0%、5%、10%、15%和20%的大麻籽的吸附和解吸等温线。杂质含量为0%的湿大麻籽还在薄层干燥器内分别于30℃、相对湿度50%，35℃、相对湿度30%和50%，以及40℃、相对湿度30%和50%的条件下进行干燥（薄层动态法）。不同杂质含量的大麻籽表现出滞后现象，且这种滞后现象随温度降低而变得更加明显。在相同条件下，杂质含量为0%的大麻籽的平衡水分含量比含杂质的大麻籽低约0.5个百分点。对于吸附和解吸等温线，拟合恒温恒湿条件下平衡水分含量数据的最佳方程是修正的GAB方程。当干燥空气相对湿度为30%或干燥空气温度为40℃时，干燥的恒速期观察到小于0.75小时。亨德森和帕比斯模型是拟合薄层干燥数据的最佳模型。当温度≤35℃时，用SSS法测得的平衡水分含量低于用薄层动态法测得的平衡水分含量。
