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https://hdl.handle.net/1822/37134
Título: | Cation effect on the (PEG 8000 + sodium sulfate) and (PEG 8000 + magnesium sulfate) aqueous two-phase system: Relative hydrophobicity of the equilibrium phases |
Autor(es): | Wysoczanska, Kamila Silvério, Sara C. Teixeira, J. A. Macedo, Eugénia A. |
Palavras-chave: | ATPS DNP amino acids Partitioning PEG Salts |
Data: | Dez-2015 |
Editora: | Elsevier 1 |
Revista: | Journal of Chemical Thermodynamics |
Citação: | Wysoczanska, Kamila; Silvério, S.; Teixeira, J. A.; Macedo, Eugénia A., Cation Effect on the (PEG 8000 + sodium sulfate and PEG 8000 + magnesium sulfate) aqueous two-phase system: Relative hydrophobicity of the equilibrium phases. Journal of Chemical Thermodynamics, 91, 321-326, 2015 |
Resumo(s): | The partitioning of four dinitrophenylated (DNP-) amino acids in aqueous two-phase systems of polyethylene glycol (PEG)-8000sodium sulfate and polyethylene glycol (PEG)-8000magnesium sulfate in five different tie-lines was experimentally determined at 298.15 K. The Gibbs free 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 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. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/37134 |
DOI: | 10.1016/j.jct.2015.08.012 |
ISSN: | 0021-9614 |
e-ISSN: | 1096-3626 |
Versão da editora: | http://www.sciencedirect.com/science/article/pii/S0021961415002943 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
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document_22344_1.pdf | 415,71 kB | Adobe PDF | Ver/Abrir |