Journal
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
Volume 939, Issue -, Pages 1-9Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jchromb.2013.09.006
Keywords
Aqueous two-phase systems; Cationic surfactant; Ionic liquids; Additives; Partitioning
Funding
- National Natural Science Foundation of China
- Shandong Province [21073081, 21001061, ZR2012BQ013]
- Program for Scientific research innovation team in colleges and universities of Shandong Province and Experimental Technology and Teaching Research Project of Liaocheng University
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Aqueous two-phase systems (ATPS) were obtained in the aqueous mixtures of a cationic surfactant and a series of ionic liquids (ILs). The effects of IL structure, temperature and additives on the phase separation were systematically investigated. The microstructures of some ATPS were observed by freeze-fracture replication technique. Lyotropic liquid crystal was found in the bottom phase besides micelles under different conditions. Remarkably, both IL structure and additives profoundly affected the formation and properties of the ATPSs. The phase separation can be attributed to the existence of different aggregates and the cation-pi interactions of the cationic surfactant with the ILs, which has a significant role in the formation of ATPS. The extraction capacity of the studied ATPS was also evaluated through their application in the extraction of two biosubstances. The results indicate that the ILs with BF4- as anion show much better extraction efficiencies than the corresponding ILs with Br- as anion do under the same conditions. L-Tryptophan was mainly distributed into the NPTAB-rich phase, while methylene blue and capsochrome were mainly in the IL-rich phase. (C) 2013 Elsevier B.V. All rights reserved.
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