The solubilities of l-glutamine in mixed solvents (ethanol + water, acetone + water) were determined at
temperatures between 278 K and 313 K. The solubilities of l-glutamine in mixed solvents (water + ethanol,
water + acetone) are a function of temperature, increasing with an increase in temperature. Pure water has
a high dissolving power. The experimental data were correlated with the Apelblat model. The calculated
values of Apelblat model were found to show a fine representation of the experimental data. Then the
dissolution enthalpy and entropy of l-glutamine were predicted from the solubility data using van’t Hoff
equation. The dissolution enthalpy and entropy of l-glutamine in water predicted from the solubility
data is less than that in mixed solvents.