期刊
FOOD CHEMISTRY
卷 245, 期 -, 页码 346-352出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2017.10.110
关键词
Aqueous biphasic systems; Ionic liquids; Polyethylene glycol; L-phenylalanine
资金
- National Natural Science Foundation of China [21676125]
- National Key Research and Development Program of China [2016YFD0400705-04, 2017YFD0400903-01]
- Special Fund of Jiangsu Province for the Transformation of Scientific and Technological Achievements [BA2016169]
- Policy Guidance Program (Research Cooperation) of Jiangsu [BY2016072-03]
- Social Development Program (General Project) of Jiangsu [BE2016779]
Polyethylene glycol (PEG) is widely used in the polymer-salt systems. However, the low polarity of the PEG-rich phase limits the application of aqueous biphasic systems (ABS). To overcome this disadvantage, a small quantity of ionic liquid (IL) was used as an adjuvant in ABS to enlarge the polarity range. Therefore, an innovative study involving addition of 4 wt% imidazolium-based ILs to the PEG 600/NaH2PO4 ABS, aiming at controlling the phase behavior and extraction ability, was carried out. The phase diagrams, the tie-lines and the partitioning behavior of L-phenylalanine and ILs were studied in these systems. The results reveal that L-phenylalanine preferentially partitions for the PEG-rich phase. The addition of 4 wt% IL to ABS controls the partitioning behavior of L-phenylalanine, which depends on the type of IL employed. Moreover, it is verified that increasing temperature lead to a decrease in the partition coefficient of L-phenylalanine.
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