Gibbs free energy of transfer of a methylene group in buffer plus ionic liquid biphasic systems
authors Rodriguez, O; Madeira, PP; Macedo, EA
nationality International
journal INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
keywords GREEN SOLVENTS; BIOCATALYSIS; TECHNOLOGY; CATALYSIS; STABILITY
abstract Partitioning experiments for a series of dinitrophenylated (DNP) amino-acids have been conducted in three (ionic liquid + sodium phosphate buffer) biphasic systems at 23 degrees C. The ionic liquids used were 1-hexyl-3-methylimidazolium tetrafluoroborate ([C(6)mim][BF4]), 1-octyl-3-methylimidazolium tetrafluoroborate ([C(8)mim][BF4]), and 1-decyl-3-methylimidazolium tetrafluoroborate ([C(10)mim][13174]). The pH of the initial aqueous solution has been fixed at 7.4, using a sodium phosphate buffer. DNP-amino acids distribute preferentially to the ionic liquid phase, and this partition increases with the length of the alkyl chain of the amino acid. The Gibbs free energy of transfer for a methylene group is calculated from the partition coefficients of the solutes. This provides a measurement for the relative hydrophobicity of the conjugated phases, and the obtained values are compared to those of other biphasic systems used in biotechnology (e.g., polymer-polymer and polymer-salt aqueous two-phase systems).
publisher AMER CHEMICAL SOC
issn 0888-5885
year published 2008
volume 47
issue 15
beginning page 5165
ending page 5168
digital object identifier (doi) 10.1021/ie0714293
web of science category Engineering, Chemical
subject category Engineering
unique article identifier WOS:000258075500022
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journal impact factor 3.573
5 year journal impact factor 3.684
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