Abstract
The solubility data of l-Theanine in pure water and three kinds of water+organic solvent mxitures were measured in temperature ranges from (278.15 to 13.15)K by using an equilibrium method. The results show that the solubility of l-Theanine increases with the increasing of temperature in all selected solvents. The modified Apelblat equation and the λ-h model were applied to correlate the solubility data in pure water, while the modified Apelblat equation, the λ-h model, the NRTL model and the Jouyban–Acree model were applied to correlate the solubility data in binary solvent mixtures. Furthermore, the mixing thermodynamic properties of l-Theanine in different solvents were also calculated based on the NRTL model and experimental solubility data.
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