PREFERENTIAL SOLVATION OF L-ARABINOSE AND DL-MALIC ACID IN ETHANOL + WATER MIXTURES

By using the inverse Kirkwood-Buff integrals (IKBI) method, the differences between the local, around the solute and the bulk mole fractions of both solvents in saturated solutions of L-arabinose (compound 3) and DL-malic acid (compound 3) in ethanol (compound 1) + water (compound 2) binary mixtures were derived from their thermodynamic properties. Accordingly, it is found that these compounds are sensitive to preferential solvation effects; in this way, the preferential solvation parameter (dx1,3) for L-arabinose is slightly positive in water-rich mixtures but negative in those beyond 0.25 in ethanol mole fraction. In different way, the dx1,3 values of DL-malic acid are negative in almost all the compositions. The highest solvation by ethanol observed in water-rich mixtures for L-arabinose could be due mainly to polarity effects. Otherwise, the preference of these compounds for water in ethanol-rich mixtures could be explained in terms of the higher acidic behavior of water interacting with hydrogen-acceptor hydroxyl groups in L-arabinose and DL-malic acid.

• Autores: Cárdenas, Zaira J.; Jiménez, Daniel M.; Martínez, Fleming
• Tipo de recurso: Article of journal
• Fecha de publicación: 2017
• Institución: Universidad Nacional de Colombia
• Repositorio: Universidad Nacional de Colombia
• Idioma: spa
• OAI Identifier: oai:repositorio.unal.edu.co:unal/67333
• Acceso en línea: https://repositorio.unal.edu.co/handle/unal/67333; http://bdigital.unal.edu.co/68362/
• Palabra clave: 53 Física / Physics; 5 Ciencias naturales y matemáticas / Science; L-arabinose; DL-malic acid; ethanol; solubility; IKBI; preferential solvation.; L-arabinosa; ácido DL-málico; etanol; solubilidad; IKBI; solvatación preferencial.
• Rights: openAccess
• License: Atribución-NoComercial 4.0 Internacional