Liquid-liquid equilibrium phase diagrams of new aqueous two-phase systems: Ucon 50-HB5100+ammonium sulfate plus water, Ucon 50-HB5100+poly(vinyl alcohol) plus water, Ucon 50-HB5100+hydroxypropyl starch plus water, and poly(ethylene glycol) 8000+poly(vinyl alcohol) plus water
authors Pereira, M; Wu, YT; Madeira, P; Venancio, A; Macedo, E; Teixeira, J
nationality International
journal JOURNAL OF CHEMICAL AND ENGINEERING DATA
keywords ENDO-POLYGALACTURONASE; HYDROXYPROPYL STARCH; ESCHERICHIA-COLI; FORMING POLYMER; SEPARATION; EXTRACTION; PURIFICATION; RECOMBINANT; PARTITION
abstract The phase diagrams of Ucon 50-HB-5100 (Ucon) + ammonium sulfate (NH4)(2)SO4 + water, Ucon 50-HB-5100 + poly(vinyl alcohol) 10000 (PVA 10000) + water, Ucon 50-HB-5100 + hydroxypropyl starch (Reppal PES 100) + water, and poly(ethylene glycol) 8000 (PEG 8000)-PVA 10000 systems were determined at 22 degreesC. Measurements at 30 and 40 degreesC were also done for each Ucon-salt system. A linear regression was used to calculate the slope and standard deviation for each tie line. The standard deviations are in most situations lower than 0.1, and the tie-line slopes for each phase diagram vary within 5.5% around the medium value for all cases with the exception of the Ucon + (NH4)(2)SO4 + water system at 40 degreesC. The phase diagrams of the Ucon + (NH4)(2)SO4 + water system at different temperatures were shown to have a smaller amount of salt and polymer than conventional systems and to be thermoseparating, versatile, and particularly attractive, since phase formation is temperature-dependent. The phase diagrams of Ucon + PVA 10000 + water, Ucon + PES + water, and PEG + PVA 10000 + water systems were very similar, since high polymer concentrations (PES or PVA 10000) are required to form the two phases.
publisher AMER CHEMICAL SOC
issn 0021-9568
year published 2004
volume 49
issue 1
beginning page 43
ending page 47
digital object identifier (doi) 10.1021/je034038d
web of science category Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical
subject category Thermodynamics; Chemistry; Engineering
unique article identifier WOS:000188005400010
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journal impact factor 2.369
5 year journal impact factor 2.503
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