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Solubility and Solution Thermodynamics of Some Sulfonamides in 1-Propanol + Water Mixtures

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Abstract

The solubilities of sulfadiazine (SD), sulfamerazine (SMR) and sulfamethazine (SMT) in some 1-propanol + water co-solvent mixtures were measured at five temperatures from 293.15 to 313.15 K over the polarity range provided by the aqueous solvent mixtures. The mole fraction solubility of all these sulfonamides was maximal in the 0.80 mass fraction of 1-propanol solvent mixture (δ solv = 28.3 MPa1/2) and minimal in water (δ = 47.8 MPa1/2) at all temperatures studied. The apparent thermodynamic functions Gibbs energy, enthalpy, and entropy of solution were obtained from these solubility data by using the van’t Hoff and Gibbs equations. Apparent thermodynamic quantities of mixing were also calculated by using the ideal solubilities reported in the literature. Nonlinear enthalpy–entropy relationships were observed for these drugs in the plots of enthalpy versus Gibbs energy of mixing. The plot of ∆mix H° versus ∆mix G° shows different trends according to the slopes obtained when the mixture compositions change. Accordingly, the mechanism for the solution process of SD and SMT in water-rich mixtures is enthalpy driven, whereas it is entropy driven for SMR. In a different way, in 1-propanol-rich mixtures the mechanism is enthalpy driven for SD and SMR and entropy driven for SMT. Ultimately, in almost all of the intermediate compositions, the mechanism is enthalpy driven. Nevertheless, the molecular events involved in the solution processes remain unclear.

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Acknowledgments

We thank the Department of Pharmacy of the National University of Colombia for facilitating us the equipment and laboratories used.

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  1. Grupo de Investigaciones Farmacéutico-Fisicoquímicas, Departamento de Farmacia, Universidad Nacional de Colombia, A.A. 14490, Bogotá D.C., Colombia

    Daniel R. Delgado & Fleming Martínez

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  1. Daniel R. Delgado
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  2. Fleming Martínez
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Correspondence to Fleming Martínez.

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Delgado, D.R., Martínez, F. Solubility and Solution Thermodynamics of Some Sulfonamides in 1-Propanol + Water Mixtures. J Solution Chem 43, 836–852 (2014). https://doi.org/10.1007/s10953-014-0169-0

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  • DOI: https://doi.org/10.1007/s10953-014-0169-0

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