Cation effect on the (PEG 8000+sodium sulfate) and (PEG 8000+magnesium sulfate) aqueous two-phase system: Relative hydrophobicity of the equilibrium phases

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Kamila Wysoczanska (Author) FEUP; Sara C. Silvério (Author) Other; José A. Teixeira (Author) Other; Eugénia A. Macedo (Author) FEUP

Journal

Title: Journal of Chemical Thermodynamics

Vol. 91

Pages: 321-326

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 6 Citations

ISI Web of Science

Scopus - 9 Citations

INSPEC

Scientific classification

CORDIS: Technological sciences

FOS: Engineering and technology

Associated Projects

LSRE-LCM - Laboratório de Processos de Separação e Reação - Laboratório de Catálise e Materiais

Other information

Authenticus ID: P-00G-JG2

DOI: 10.1016/j.jct.2015.08.012

Abstract (EN): The partitioning of four dinitrophenylated (DNP-) amino acids in aqueous two-phase systems of (polyethylene glycol (PEG)-8000 + sodium sulfate) and (polyethylene glycol (PEG)-8000 + magnesium sulfate) in five different tie-lines was experimentally determined at T = 298.15 K. The Gibbs energy of transfer of a methylene group between the two phases was calculated from the measured partition coefficients. This characterizes the relative hydrophobicity of the equilibrium phases. Values of Delta G*(CH2) were in range from (-0.674 to -1.012) kJ.mol(-1). A comparison of both systems was carried out. The results show that the cation type has a strong influence on the amino acids partitioning process. The largest relative hydrophobicity was noted for the ATPS system formed by sodium sulfate. This showed to be a better system for the separation.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6