Commentary concerning “Thermodynamic properties of l-Theanine in different solvents”

Errors are discovered regarding the published equation curve-fit coefficients of Zhou et al. [1] for mathematically describing the solubility of l-Theanine in pure water and three kinds of water + organic solvent mixtures using the modified Apelblat equation and Jouyban-Acree model. The calculated values using the published equation coefficients for the two models do not correctly describe the determined solubility data as stated in the published paper. In addition, the equation parameters were re-analysed based on the reported solubility data.