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Title: Solubility and preferential solvation of some n-alkyl-parabens in methanol + water mixtures at 298.15 K
Author: Cárdenas, Zaira J.
Jiménez, Daniel M.
Delgado, Daniel Ricardo
Almanza Montero, Ovidio Amado
Jouyban, Abolghasem
Martínez, Fleming
Acree Jr, William Eugene
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Issue Date: 9-Jan-2017
Advisor / Validator: Delgado, Daniel Ricardo
Keywords: Parabens Solubility Methanol + water mixtures Jouyban-Acree model Inverse Kirkwood-Buff integrals Preferential solvation
Resume: Articulo Científico
Abstract: Methyl, ethyl and propyl parabens equilibrium solubility was determined in (methanol + water) binary mixtures at 298.15K. The mole fraction solubility of these compounds increased in 503 (from 2.40 10 4 to 0.121), 1377 (from 9.86 10 5 to 0.136) and 4597 (from 3.73 10 5 to 0.171) times when passing from neat water to neat methanol, for methyl, ethyl and propyl parabens, respectively. All these solubility values were correlated with the Jouyban-Acree model. Preferential solvation parameters by methanol (dx1,3) of these parabens were derived from their thermodynamic solution properties using the inverse Kirkwood-Buff integrals (IKBI) method. For all compounds dx1,3 values are negative in water-rich mixtures but positive in mixtures with methanol mole fraction greater than 0.32. It is conjec- turable that in the former case the hydrophobic hydration around non-polar groups of parabens plays a relevant role in the solvation. Besides, the preferential solvation of these solutes by methanol in mixtures of similar co-solvent compositions and in methanol-rich mixtures could be explained in terms of the higher basic behaviour of methanol.
Table Of Contents: 1. Introduction, 2. Experimental, 3. Results and discussion, 4. Conclusions, References
Program: Ingeniería Industrial
Headquarters: Neiva
Type: Artículo
CC Licence: Licencia CC
Citation: Zaira J. Cárdenas, Daniel M. Jiménez, Daniel R. Delgado, Ovidio A. Almanza, Abolghasem Jouyban, Fleming Martínez, William E. Acree Jr. Solubility and preferential solvation of some n-alkyl-parabens in methanol + water mixtures at 298.15 K. J. Chem. Thermodynamics 108 (2017) 26–37
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