This paper aims at investigating the hygroscopic behavior and the thermodynamic characterization of the dandelion (Taraxacum officinale) leaves and root during moisture sorption phenomena. This study has been conducted by using the saturated salt solutions at different temperatures 30 °C, 40 °C and 50 °C. The obtained isotherms curves of all samples were of sigmoidal Type II. The optimal water activity was determined. Moreover, thirteen models are fitted and compared in order to choose the most suitable model that perfectly represents the relationship between moisture sorption content and water activity. The comparison of these models has been based on the coefficient of correlation as well as the standard error of estimate. Furthermore, several equations are used to determine the net isosteric heat of sorption, the sorption differential entropy, the spreading pressure, the specific surface area of sorption, and the enthalpy-entropy compensation theory. All these thermodynamic properties allow us to analyze the thermodynamic behavior of the leaves and the dandelion root during the sorption processes.

本文旨在研究蒲公英（蒲公英）的吸湿性和热力学特性。）叶和根在吸湿期间的现象。本研究是通过在30°C，40°C和50°C不同温度下使用饱和盐溶液进行的。得到的所有样品的等温线曲线均为S型。确定了最佳水活度。此外，拟合并比较了十三种模型，以选择最合适的模型，该模型完美地表示了水分吸收量和水分活度之间的关系。这些模型的比较是基于相关系数以及估计的标准误差。此外，使用几个方程式来确定吸附的净等距热量，吸附的微分熵，扩散压力，吸附的比表面积以及焓-熵补偿理论。