Solvent extraction studies on Th(IV) and U(VI) using PolyEthylene Glycol (PEG) based aqueous biphasic system (ABS) with 18-crown-6

Various studies on the complexation between crown ethers and biomolecules bearing primary amino groups have been conducted. In the present study, extraction of amino compounds based on the complexation with a crown ether in Li 2 SO 4 /PEG aqueous two-phase system has been examined. In the series of crown ethers and their analogues, only dicyclohexano-18-crown-6 (DCH18C6) functioned as a ligand for enhancing the extraction of amino compounds into the PEG-rich phase. The number of primary amino groups of the guest molecules as well as their hydrophobicity is dominant for enhancing the extraction based on the complexation with DCH18C6. From the results of slope analysis, the number of DCH18C6 molecules complexing with an amino compound agreed with the number of primary amino groups.

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“…18-crown-6 and 15-crown-5 [12][13][14]. For instance, the stoichiometry of the complex between PuO 2 2+ and…”

Section: Solvent Extraction Research and Development Japan Vol 17mentioning

confidence: 99%

Enhanced Extraction of Amino Compounds Using Dicyclohexyl-18-crown-6 as a Ligand in an Aqueous Two-phase System

Kai

Oshima

Baba

2010

SERDJ

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“…2 Further, the components of many ABSs are generally nonvolatile, nontoxic, and considered environmentally benign, thus making ABSs attractive as potentially "green" media for separations. [4][5][6][7][11][12][13][14][15] Several biological applications of ABSs have been reported using these systems, owing to the gentle and nondenaturing character of their phases. [16][17][18][19] Separations of metal ions, organic molecules, radiochemicals, nanoparticulate matter, and minerals have been previously demonstrated in ABSs.…”

Section: Introductionmentioning

confidence: 99%

“…ABSs are particularly attractive as separating media because both of the phases are mainly composed of water . Further, the components of many ABSs are generally nonvolatile, nontoxic, and considered environmentally benign, thus making ABSs attractive as potentially “green” media for separations. − ,− Several biological applications of ABSs have been reported using these systems, owing to the gentle and nondenaturing character of their phases. − Separations of metal ions, organic molecules, radiochemicals, nanoparticulate matter, and minerals have been previously demonstrated in ABSs. − However, to gain wider acceptance in industry, the fundamental parameters governing partitioning in these systems need to be further understood. This work investigates one such parameter, temperature, and the differences in its effect on poly(ethylene glycol) (PEG) versus poly(ethylene oxide)−poly(propylene oxide) (EO−PO) random copolymer ABSs.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Temperature Effects on the Salting Out of Poly(ethylene glycol) versus Poly(ethylene oxide)−Poly(propylene oxide) Random Copolymer

Dilip

Griffin

Spear

et al. 2010

Ind. Eng. Chem. Res.

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In common with many poly(ethylene glycol)s (PEGs), a poly(ethylene oxide)−poly(propylene oxide) random copolymer (EO−PO, with EO/PO = 1:1.3) of molecular weight 3320 g·mol−1, known as Sunbright-3320 (SB-3320), can be salted out of aqueous solution using kosmotropic salts such as (NH4)2SO4 to form aqueous biphasic systems (ABSs) comprising upper polymer-rich and lower salt-rich aqueous phases. The effects of temperature on these liquid/liquid ABSs and related solid/liquid resin-based systems, where one end of the polymer has been covalently attached to a solid support, have been studied. Distribution ratios of NH4 99TcO4 were determined radiometrically at various polymer and salt concentrations and temperatures. SB-3320-grafted poly(styrene) resins exhibit opposite effects of variable-temperature partitioning compared to the SB-3320-based ABS. However, the results are complicated because of the conformational changes that are possible for the SB-3320 polymer. Enthalpy and entropy changes were found to be temperature-dependent. The differences observed between the distribution of 99TcO4 − in EO−PO-based systems versus PEG-based systems can be attributed to the lower cloud point temperatures and probable conformational changes for the EO−PO systems.

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Extraction and separation of a lysine-rich protein by formation of supramolecule between crown ether and protein in aqueous two-phase system

Oshima

Suetsugu

Baba

2010

Analytica Chimica Acta

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Solvent extraction studies on Th(IV) and U(VI) using PolyEthylene Glycol (PEG) based aqueous biphasic system (ABS) with 18-crown-6

Abstract: SummaryExtraction of Th(IV) and U(VI) using PEG-2000/(NH

Cited by 3 publications

References 8 publications

Enhanced Extraction of Amino Compounds Using Dicyclohexyl-18-crown-6 as a Ligand in an Aqueous Two-phase System

Enhanced Extraction of Amino Compounds Using Dicyclohexyl-18-crown-6 as a Ligand in an Aqueous Two-phase System

Comparison of Temperature Effects on the Salting Out of Poly(ethylene glycol) versus Poly(ethylene oxide)−Poly(propylene oxide) Random Copolymer

Extraction and separation of a lysine-rich protein by formation of supramolecule between crown ether and protein in aqueous two-phase system

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