Articles & Issues
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
-
Received August 29, 2022
Revised January 13, 2023
Accepted January 31, 2023
- Acknowledgements
- This investigation was performed within the State Program of Fundamental Scientific Research (No 122040600071-9).
- This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
All issues
Griseofulvin: Thermodynamic insight to solubility, solvation and partition processes
Abstract
The solubility of griseofulvin in buffer solutions (pH 2.0 and 7.4), 1-octanol and hexane was measured in
the temperature range 293.15-313.15 K by the shake flask method. It was found that griseofulvin is poorly soluble in
aqueous buffer solutions (x8.63∙107
), while the best solubility is observed in 1-octanol (x6.56∙104
). The solubility
evaluation in different solvents with the help of Hansen solubility parameters showed the consistency with the experimental data. The solubility was revealed to significantly depend on the dispersion interactions and polar bonds. The
dissolution and solvation thermodynamic functions of the drug were calculated. The Gibbs energy and enthalpy of
drug dissolution in aqueous and organic solvents are positive, which characterizes the dissolution process as hindered
and endothermic. The van’t Hoff and Apelblat equations gave good correlations when used for modeling the experimental solubility results. Based on the data on the solubility and thermophysical parameters of the compound, the temperature dependences of the activity coefficients were determined and the excess thermodynamic functions of
dissolution were calculated. Positive deviation from ideality was observed in all the solvent-solute systems studied. The
partition coefficients of the drug in the 1-octanol/buffer pH 7.4 system were obtained and the transfer thermodynamic
functions were derived. It was established that the drug distribution from the aqueous solution to the octanol phase
was thermodynamically favorable and endothermic.
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