Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/16856
Registo completo
Campo DC | Valor | Idioma |
---|---|---|
dc.contributor.author | Ferreira, Luísa A. | - |
dc.contributor.author | Teixeira, J. A. | - |
dc.date.accessioned | 2012-02-07T10:26:32Z | - |
dc.date.available | 2012-02-07T10:26:32Z | - |
dc.date.issued | 2011-07 | - |
dc.identifier | 0021-9614 | por |
dc.identifier | 1096-3626 | por |
dc.identifier.issn | 0021-9614 | por |
dc.identifier.uri | https://hdl.handle.net/1822/16856 | - |
dc.description.abstract | The relative hydrophobicity of the phases of several {polyethylene glycol (PEG) 8000 + sodium sulfate (Na2SO4)} aqueous two-phase systems (ATPSs), all containing 0.01 mol.L-1 sodium phosphate buffer (NaPB, pH 7.4) and increasing concentration of a salt additive, NaCl or KCl, up to 1.0 mol.L-1, was measured by the free energy of transfer of a methylene group between the phases, DG(CH2). The DG(CH2) of the systems was determined by partitioning of a homologous series of five sodium salts of dinitrophenylated (DNP) – amino acids with aliphatic side chains in three different tie-lines of each biphasic system. The relative hydrophobicity of the phases ranged from -0.125 to -0.183 kcal.mol.L-1, being the NaCl salt the one to provide the more effective changes. The results show that, within each system, there is a linear relationship between the DG(CH2) and the tie-line length (TLL), and biphasic systems with high salt additive concentration present the most negative DG(CH2) values. Therefore, the feasibility of establishing a relationship between the relative hydrophobicity of the phases in a given TLL and the ionic strength of the salt additive was investigated and a satisfactory correlation was found for each salt. | por |
dc.description.sponsorship | Luisa A. Ferreira acknowledges the financial support (SFRH/BPD/47607/2008) from Fundacao para a Ciencia e a Tecnologia (Lisboa, Portugal). | por |
dc.language.iso | eng | por |
dc.publisher | Elsevier 1 | por |
dc.rights | openAccess | por |
dc.subject | Aqueous two-phase systems | por |
dc.subject | Salt effect | por |
dc.subject | Relative hydrophobicity | por |
dc.subject | Gibbs free energy of transfer | por |
dc.title | Salt effect on the (polyethylene glycol 8000 + sodium sulfate) aqueoustwo-phase system : relative hydrophobicity of the equilibrium phases | por |
dc.type | article | por |
dc.peerreviewed | yes | por |
sdum.publicationstatus | published | por |
oaire.citationStartPage | 1299 | por |
oaire.citationEndPage | 1304 | por |
oaire.citationIssue | 8 | por |
oaire.citationTitle | Journal of Chemical Thermodynamics | por |
oaire.citationVolume | 43 | por |
dc.identifier.doi | 10.1016/j.jct.2011.03.014 | por |
dc.subject.wos | Science & Technology | por |
sdum.journal | Journal of Chemical Thermodynamics | por |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |