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Title: Solution thermodynamics and preferential solvation of sulfamethazine in (methanol + water) mixtures
Author: Delgado, Daniel Ricardo
Almanza, Ovidio A.
Martínez, Fleming
Peña, María A.
Jouyban, Abolghasem
Acree Jr, William E.
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Issue Date: 8-Feb-2016
Advisor / Validator: Delgado, Daniel Ricardo
Keywords: Sulfamethazine;Methanol;Solubility;Jouyban–Acree model;Activity coefficient;Solution thermodynamic quantities;Preferential solvation
Description: Artículo de investigación
Abstract: The solubility of sulfamethazine (SMT) in {methanol (1) + water (2)} co-solvent mixtures was determined at five different temperatures from (293.15 to 313.15) K. The sulfonamide exhibited its highest mole frac- tion solubility in pure methanol (d1 = 29.6 MPa1/2) and its lowest mole fraction solubility in water (d2 = 47.8 MPa1/2) at each of the five temperatures studied. The Jouyban–Acree model was used to corre- late/predict the solubility values. The respective apparent thermodynamic functions Gibbs energy, enthalpy, and entropy of solution were obtained from the solubility data through the van’t Hoff and Gibbs equations. Apparent thermodynamic quantities of mixing were also calculated for this drug using values of the ideal solubility reported in the literature. A non-linear enthalpy–entropy relationship was noted for SMT in plots of both the enthalpy vs. Gibbs energy of mixing and the enthalpy vs. entropy of mixing. These plots suggest two different trends according to the slopes obtained when the composition of the mixtures changes. Accordingly, the mechanism for SMT transfer processes in water-rich mixtures from water to the mixture with 0.70 in mass fraction of methanol is entropy driven. Conversely, the mechanism is enthalpy driven in mixtures whenever the methanol composition exceeds 0.70 mol frac- tion. An inverse Kirkwood–Buff integral analysis of the preferential solvation of SMT indicated that the drug is preferentially solvated by water in water-rich mixtures but is preferentially solvated by methanol in methanol-rich mixtures.
Table Of Contents: 1. Introduction. 2. Experimental. 2.1. Reagents. 2.2. Preparation of solvent mixtures. 2.3. Solubility determinations. 2.4. Calorimetric study. 2.5. X-ray diffraction analysis. 3. Results and discussion. 3.1. Equilibrium solubility of SMT. 3.2. Log-linear model of Yalkowsky. 3.3. Jouyban–Acree model. 3.4. Activity coefficients of SMT. 3.5. Apparent thermodynamic quantities of SMT dissolution. 3.6. Apparent thermodynamic quantities of SMT mixing. 3.7. Enthalpy–entropy compensation analysis of SMT. 3.8. Preferential solvation of SMT. 4. Conclusions. Acknowledgments. References.
Program: Ingeniería Industrial
Headquarters: Neiva
Publisher: Universidad Cooperativa de Colombia, Facultad de Ingenierías, Programa de Ingeniería Industrial, Neiva, Colombia, 00000
Type: Artículo
CC Licence: Licencia CC
Citation: Daniel R. Delgado, Ovidio A. Almanza , Fleming Martínez, María A. Peña, Abolghasem Jouyban, William E. Acree Jr. Solution thermodynamics and preferential solvation of sulfamethazine in (methanol + water) mixtures. J. Chem. Thermodynamics 97 (2016) 264–276
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Appears in Collections:Ingeniería Industrial

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