Thermodynamic analysis of the solubility of propranolol-HCl in ethanol + water mixtures

 

Autores
Martínez, Fleming; Delgado, Daniel R.
Tipo de recurso
artículo
Estado
Versión publicada
Año de publicación
2011
País
Argentina
Institución
Universidad Nacional de La Plata
Repositorio
SEDICI (UNLP)
Descripción
Propranolol-HCl (PPN-HCl) is a non selective β-adrenergic blocker widely used in therapeutics. Nevertheless, their physicochemical properties in aqueous media have not been adequately studied. In this context, by using the van't Hoff and Gibbs equations the thermodynamic functions Gibbs energy, enthalpy, and entropy of solution for this drug in ethanol (EtOH) + water (W) cosolvent mixtures, were evaluated from solubility data determined at several temperatures. The solubility was the greatest in the mixtures with 0.60 or 0.70 in mass fraction of EtOH and the lowest in neat W (or neat EtOH, as well) at almost all the temperatures studied. This behavior shows the cosolvent effect present for this electrolyte drug in this solvent system. By means of enthalpy-entropy compensation analysis, non-linear ΔH soln 0-app vs. ΔG soln 0-app plot with negative slope from water up to 0.10 in mass fraction of EtOH and positive slope from 0.10 to 0.60 in mass fraction of EtOH. Accordingly to this result, it follows that the dominant mechanism for the solubility of PPN-HCl in water-rich mixtures is the entropy, probably due to water-structure loosing around the drug's non-polar moieties by EtOH molecules, whereas, between 0.10 and 0.60 in mass fraction of EtOH the dominant mechanism is the enthalpy probably due to drug solvation increase by EtOH molecules. Ultimately, beyond this composition the behavior was more complex, and therefore, the ionic and molecular events involved in the drug dissolution in ethanol-rich mixtures are unclear.
Idioma
inglés
OAI Identifier
oai:sedici.unlp.edu.ar:10915/8105
Enlace del recurso
http://sedici.unlp.edu.ar/handle/10915/8105
http://hdl.handle.net/10915/8105
http://www.latamjpharm.org/resumenes/30/1/LAJOP_30_1_1_13.pdf
Nivel de acceso
Acceso abierto
Materia
Farmacia
Solubilidad
Alcoholes
Termodinámica
cosolvency; ethanol; solubility; solution thermodynamics; propranolol-HCl