Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/8250

TitleΔG(CH2) in PEG-Salt and Ucon-Salt Aqueous Two-Phase Systems
Author(s)Silvério, Sara C.
Madeira, Pedro
Rodríguez, Oscar
Teixeira, J. A.
Macedo, Eugénia
Issue dateJul-2008
PublisherAmerican Chemical Society
JournalJournal of Chemical & Engineering Data
Citation"Journal of Chemical & Engineering Data". Issn 0021-9568. 53:7 (july 2008) 1622-1625.
Abstract(s)Three new phase diagrams for polymer−salt aqueous two-phase systems (ATPS) at 23 °C are presented. Then, partition coefficients for a series of five dinitrophenylated amino acids were obtained experimentally in five polymer−salt ATPS. The ATPS were obtained combining a polymer, polyethylene glycol (PEG) or Ucon (a random copolymer of 50 % ethylene oxide and 50 % propylene oxide), and a salt (Na2SO4, (NH4)2SO4, or Li2SO4). The series of amino acids allowed the calculation of the free energy of transfer of a methylene group, which is used as a measure of the relative hydrophobicity of the equilibrium phases. Ucon-rich phases proved to have a higher affinity for methylene groups than PEG which suggests a more efficient biphasic separation system with lower cross-contamination.
TypeArticle
URIhttp://hdl.handle.net/1822/8250
DOI10.1021/je800154y
ISSN0021-9568
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

Files in This Item:
File Description SizeFormat 
Silverio_JCED[1].pdf89,2 kBAdobe PDFView/Open

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu ORCID