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Gibbs free energy of transfer of a methylene group in buffer + ionic liquid biphasic systems / Oscar Rodriguez in Industrial & engineering chemistry research, Vol. 47 n°15 (Août 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5165–5168 Titre : Gibbs free energy of transfer of a methylene group in buffer + ionic liquid biphasic systems Type de document : texte imprimé Auteurs : Oscar Rodriguez, Auteur ; Pedro P. Madeira, Auteur ; Eugénia A. Macedo, Auteur Année de publication : 2008 Article en page(s) : p. 5165–5168 Note générale : Bibliogr. p. 5168 Langues : Anglais (eng) Mots-clés : Dinitrophenylated  amino-acids;  Ionic  liquid  system Résumé : Partitioning experiments for a series of dinitrophenylated (DNP) amino-acids have been conducted in three (ionic liquid + sodium phosphate buffer) biphasic systems at 23 °C. The ionic liquids used were 1-hexyl-3-methylimidazolium tetrafluoroborate ([C6mim][BF4]), 1-octyl-3-methylimidazolium tetrafluoroborate ([C8mim][BF4]), and 1-decyl-3-methylimidazolium tetrafluoroborate ([C10mim][BF4]). The pH of the initial aqueous solution has been fixed at 7.4, using a sodium phosphate buffer. DNP−amino acids distribute preferentially to the ionic liquid phase, and this partition increases with the length of the alkyl chain of the amino acid. The Gibbs free energy of transfer for a methylene group is calculated from the partition coefficients of the solutes. This provides a measurement for the relative hydrophobicity of the conjugated phases, and the obtained values are compared to those of other biphasic systems used in biotechnology (e.g., polymer−polymer and polymer−salt aqueous two-phase systems). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0714293 [article] Gibbs free energy of transfer of a methylene group in buffer + ionic liquid biphasic systems [texte imprimé] / Oscar Rodriguez, Auteur ; Pedro P. Madeira, Auteur ; Eugénia A. Macedo, Auteur . - 2008 . - p. 5165–5168. Bibliogr. p. 5168 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5165–5168 Mots-clés : Dinitrophenylated  amino-acids;  Ionic  liquid  system Résumé : Partitioning experiments for a series of dinitrophenylated (DNP) amino-acids have been conducted in three (ionic liquid + sodium phosphate buffer) biphasic systems at 23 °C. The ionic liquids used were 1-hexyl-3-methylimidazolium tetrafluoroborate ([C6mim][BF4]), 1-octyl-3-methylimidazolium tetrafluoroborate ([C8mim][BF4]), and 1-decyl-3-methylimidazolium tetrafluoroborate ([C10mim][BF4]). The pH of the initial aqueous solution has been fixed at 7.4, using a sodium phosphate buffer. DNP−amino acids distribute preferentially to the ionic liquid phase, and this partition increases with the length of the alkyl chain of the amino acid. The Gibbs free energy of transfer for a methylene group is calculated from the partition coefficients of the solutes. This provides a measurement for the relative hydrophobicity of the conjugated phases, and the obtained values are compared to those of other biphasic systems used in biotechnology (e.g., polymer−polymer and polymer−salt aqueous two-phase systems). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0714293