Solubility of bosentan in {propylene glycol + water} mixtures at various temperatures: experimental data and mathematical modelling

ABSTRACT

Solubility measurements were performed for bosentan (BST) in binary mixtures of propylene glycol (PG) and water at atmospheric pressure within the temperature range, T = 293.2 – 313.2 K by employing a shake-flask method. Generated solubility data were correlated with Jouyban-Acree-van’t Hoff model and the accuracies of the predicted solubilities and model performance were illustrated by mean relative deviations (MRD). Furthermore, the apparent thermodynamic properties of BST dissolving in all the mixed solvents were calculated, and the obtained results show that the dissolution process is endothermic. By using the inverse Kirkwood–Buff integrals, it was observed that BST is preferentially solvated by water in water-rich solvent mixtures and preferentially solvated by PG (as a cosolvent) in the composition range of 0.20 < x₁ < 1.00 at 298.2 K.

KEYWORDS:

• Solubility
• bosentan
• propylene glycol
• binary solvent mixture
• Jouyban-Acree-Hoff model
• preferential solvation

Acknowledgements

This report is a part of the results of Monireh Babaei’s Pharm.D thesis submitted to the Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran. Also, Elaheh Rahimpour would like to thank for a post-doctorate grant (1051830) of Tabriz University of Medical Sciences for supporting this work. We also would like to thank Prof. Abbas Kebriaeezadeh, Danesh Pharmaceutical Company (Tehran, Iran) for gifting BST powder.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

Elaheh Rahimpour would like to thank for a post-doctorate grant (1051830) of Tabriz University of Medical Sciences for supporting this work.