Moisture adsorption isotherm potentials and energy models of Gongronema latifolium leaf grits were investigated. Fresh leaves were dried in sun; passive solar dryer and hot air oven, while proximate composition of the dried and fresh leaves were determined using standard laboratory procedure. Equilibrium moisture content (EMC) of the leaf grits was measured using gravimetric static method. Selected mathematical and statistical models were applied on the experimental data to evaluate data fitting. Energy calculations were done based on the mathematical models. The EMCs of the leaf grits directly increased with water activity (a_W) at specific temperatures. Adsorption data was better represented by GAB model than others while differential enthalpy decreased as the EMC of the oven sample increased. Differential entropy of all the samples decreased as the EMC increased. The safest monolayer moisture content varied between 7.1036 and 8.0164 gH₂O/100 g solid, below 40°C, within relative humidity of 10%–50%. Sun and oven leaf grits adsorbed more moisture than solar sample. Proximate contents of the dried leaves showed higher values for protein and ash. Overall results indicated that the leaf grits when properly packaged could be used as spice or tea powder to manage household nutrient security in addition to the use as therapeutic foods.

中文翻译：

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不同环境下干燥的贡格罗玛叶的水分吸附潜力和能量模型

研究了Gongronema latifolium叶砂的水分吸附等温势和能量模型。新鲜的叶子在阳光下晒干；被动式太阳能干燥机和热风炉，而干燥和新鲜叶子的近似成分是使用标准实验室程序确定的。使用重量静态法测量叶粒的平衡水分含量（EMC）。将选定的数学和统计模型应用于实验数据以评估数据拟合。能量计算是根据数学模型进行的。在特定温度下，叶粒的 EMC 随水分活度 (a _W ) 直接增加。GAB 模型比其他模型更好地表示了吸附数据，而微分焓随着烘箱样品的 EMC 增加而降低。所有样品的微分熵随着 EMC 的增加而减少。最安全的单层水分含量在 7.1036 至 8.0164 gH ₂ O/100 g 固体之间变化，温度低于 40°C，相对湿度为 10%–50%。阳光和烤箱叶粒比阳光样品吸收更多的水分。干叶的近似含量显示出较高的蛋白质和灰分值。总体结果表明，正确包装的叶渣除了用作治疗食品外，还可以用作香料或茶粉，以管理家庭营养安全。