Gibbs free energy of transfer of a methylene group in buffer plus ionic liquid biphasic systems

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Oscar Rodríguez (Autor) FEUP; Pedro P. Madeira (Autor) FEUP; Eugénia A. Macedo (Autor) FEUP

Revista

Título: Industrial & Engineering Chemistry Research

Vol. 47

Páginas: 5165-5168

ISSN: 0888-5885

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 11 Citações

ISI Web of Science

Scopus - 12 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

Outras Informações

ID Authenticus: P-003-X36

DOI: 10.1021/ie0714293

Abstract (EN): Partitioning experiments for a series of dinitrophenylated (DNP) amino-acids have been conducted in three (ionic liquid + sodium phosphate buffer) biphasic systems at 23 degrees C. The ionic liquids used were 1-hexyl-3-methylimidazolium tetrafluoroborate ([C(6)mim][BF4]), 1-octyl-3-methylimidazolium tetrafluoroborate ([C(8)mim][BF4]), and 1-decyl-3-methylimidazolium tetrafluoroborate ([C(10)mim][13174]). 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).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4