The solubility of
itraconazole hydroxy isobutyltriazolone
(IHI) in four commonly used binary solvent mixtures of N,N-dimethylformamide (DMF) + water, DMF + ethanol,
tetrahydrofuran (THF) + water, and THF + ethanol was determined with
gravimetric method at temperatures ranging from 283.15 to 323.15 K
under atmospheric pressure. The solubility of IHI in all selected
solvents increases with the increase of temperature. The maximum solubility
of IHI exists in the solvent of DMF + ethanol (0.06523 mol·mol–1, x
2
0 = 0.7, T = 323.15 K), while
the minimum solubility exists in DMF + water (0.0003723 mol·mol–1, x
2
0 = 0.3, T = 283.15 K). There
is a co-solvency phenomenon in the mixed solvents of DMF+ ethanol,
THF + water, and THF + ethanol. Four thermodynamic models, including
the modified Apelblat model, the Yaws model, the Sun model, and the
modified Jouyban–Acree model, were selected to fit the solubility
data of IHI. All the RAD values are less than 0.0484,
and RMSD values are not more than 0.001319. The Yaws
model and the modified Apelblat model fit the solubility data of IHI
better than the other two models. All the selected four models can
fit the solubility data of IHI well.