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https://hdl.handle.net/1822/8514| Título: | Relative hydrophobicity of (PEG or Ucon)-salt ATPSs |
| Autor(es): | Silvério, Sara C. Madeira, Pedro Rodríguez, Oscar Teixeira, J. A. Macedo, Eugénia |
| Palavras-chave: | Aqueous two-phase systems Partition coefficient Hydrophobicity Aminoacids |
| Data: | Set-2008 |
| Editora: | Universidade do Minho. Departamento de Engenharia Biológica (DEB) |
| Citação: | FERREIRA, E. C.; MOTA, M., ed. lit. – “Chempor 2008 : proceedings of the International Chemical and Biological Engineering Conference, 10, Braga, 2008”. Braga : Departamento de Engenharia Biológica da Universidade do Minho, 2008. ISBN 978-972-97810-4-9. p. 2168-2171. |
| Resumo(s): | Aqueous Two-Phase Systems (ATPSs) are biphasic systems composed mainly by water. ATPSs are obtained upon mixing of two aqueous solutions of certain polymers or a polymer and a salt (above certain critical conditions, e.g. concentration, temperature). These systems are commonly indicated for the extraction of biomolecules. In this work, the partition coefficients for a series of five dinitrophenylated amino-acids (ranging from glycine to amino-caprylic acid) were determined experimentally in five different polymer-salt ATPSs (polymers: PEG or Ucon; salts: Na2SO4, Li2SO4 or (NH4)2SO4) at 23ºC. Values of the free energy of transfer of a methylene group, ΔG(CH2), for the five ATPSs were obtained from the partition coefficients and compared with ΔG(CH2) previously obtained for PEG-Na2SO4 (Rodríguez et al., 2007). Ucon-salt ATPSs presented higher values of ΔG(CH2) than the corresponding PEG-salt systems, witch indicates that the Ucon-rich phase is more hydrophobic than the PEG-rich phase. |
| Tipo: | Artigo em ata de conferência |
| URI: | https://hdl.handle.net/1822/8514 |
| ISBN: | 978-972-97810-3-2 |
| Arbitragem científica: | yes |
| Acesso: | Acesso aberto |
| Aparece nas coleções: |
Ficheiros deste registo:
| Ficheiro | Descrição | Tamanho | Formato | |
|---|---|---|---|---|
| Silverio[1].pdf | 530,82 kB | Adobe PDF | Ver/Abrir |
