Separation selectivity of aqueous polyethylene glycol-based separation systems: DSC, LC and aqueous two-phase extraction studies
| Autor: | Takayuki Baba, Ryosaku Sakamoto, Shingo Saito, Masami Shibukawa, Koichi Oguma, Ryoichi Ichikawa |
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| Rok vydání: | 2008 |
| Předmět: |
Aqueous solution
Chromatography Polymers and Plastics Ethylene oxide Chemistry Organic Chemistry Extraction (chemistry) technology industry and agriculture Aqueous two-phase system macromolecular substances Polyethylene glycol aqueous two-phase system separation selectivity chemistry.chemical_compound Differential scanning calorimetry Liquid–liquid extraction polyethylene glycol PEG ratio Materials Chemistry |
| Zdroj: | Polymer. 49:4168-4173 |
| ISSN: | 0032-3861 |
| Popis: | The distribution behavior of n-alcohols, ketones and nitroalkanes in aqueous liquid chromatography with a column packed with polyethylene glycol (PEG) gel, TSKgel Ether-250, was compared with that in aqueous two-phase systems (ATPSs) formed from PEG and Na2SO4 or (NH4)(2)SO4. The plots of the distribution data obtained for the PEG gel system against those for the ATPS reveal that the separation selectivities exerted by the PEG gel system and the PEG-based ATPS are approximately the same. Differential scanning calorimetry studies on aqueous PEG solutions suggest that PEG polymer forms a hydration structure of which the composition is 50% (w/w) PEG or the hydration number per ethylene oxide is 2.4 and the separation selectivity of the PEG-water systems can be attributed to partition of solute compounds into the hydrated PEG polymer structure. (C) 2008 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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