One-step extraction and concentration of estrogens for an adequate monitoring of wastewater using ionic-liquid-based aqueous biphasic systems

Dinis, Teresa B. V.; Passos, Helena; Lima, Diana L.D.; Esteves, Valdemar I.; Coutinho, João A. P.; Freire, Mara G.

doi:10.1039/c5gc00077g

Cited by 46 publications

(37 citation statements)

References 60 publications

(94 reference statements)

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“…However, recent advances have shown that IL-based ABSs are by far more fascinating than these conventional systems due to the possibility of adapting their phase polarities to maximize the partition and selectivity of target compounds 13. Indeed, ABSs composed of ILs proved to lead to complete extractions of the most diverse compounds, in a single-step, by a proper tuning of their chemical structures 14–16…”

Section: Introductionmentioning

confidence: 99%

Aqueous biphasic systems composed of ionic liquids and polypropylene glycol: insights into their liquid–liquid demixing mechanisms

Neves

Shahriari

Lemus

et al. 2016

Phys. Chem. Chem. Phys.

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Novel ternary phase diagrams of aqueous biphasic systems (ABSs) composed of polypropylene glycol with an average molecular weight of 400 g mol(-1) (PPG-400) and a vast number of ionic liquids (ILs) were determined. The large array of selected ILs allowed us to evaluate their tuneable structural features, namely the effect of the anion nature, cation core and cation alkyl side chain length on the phase behaviour. Additional evidence on the molecular-level mechanisms which rule the phase splitting was obtained by (1)H NMR (Nuclear Magnetic Resonance) spectroscopy and by COSMO-RS (Conductor-like Screening Model for Real Solvents). Some systems, for which the IL-PPG-400 pairs are completely miscible, revealed to be of type "0". All data collected suggest that the formation of PPG-IL-based ABSs is controlled by the interactions established between the IL and PPG, contrarily to previous reports where a "salting-out" phenomenon exerted by the IL over the polymer in aqueous media was proposed as the dominant effect in ABS formation. The influence of temperature on the liquid-liquid demixing was also evaluated. In general, an increase in temperature favours the formation of an ABS in agreement with the lower critical solution temperature (LCST) phase behaviour usually observed in polymer-IL binary mixtures. Partition results of a dye (chloroanilic acid, in its neutral form) further confirm the possibility of tailoring the phases' polarities of IL-PPG-based ABSs.

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Section: Introductionmentioning

confidence: 99%

Aqueous biphasic systems composed of ionic liquids and polypropylene glycol: insights into their liquid–liquid demixing mechanisms

Neves

Shahriari

Lemus

et al. 2016

Phys. Chem. Chem. Phys.

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“…Cloud points and tie-lines of the ternary systems containing ethyl lactate, water and salt (potassium phosphate, potassium hydrogen phosphate and potassium carbonate) are determined at 298.2 K and 313.2 K. In addition, partition coefficients of L-tryptophan, L-phenylalanine and L-tyrosine between ethyl lactaterich and aqueous phases at two temperatures of 298.2 K and 313.2 K are presented. [28][29], [15]. Obtained cloud points were fitted using the equation given by Merchuk et al [30] to obtain solubility curves:…”

Section: Introductionmentioning

confidence: 99%

Partitioning of amino acids in the novel biphasic systems based on environmentally friendly ethyl lactate

Kamalanathan

Canal

Hegarty

et al. 2018

Fluid Phase Equilibria

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For the first time, we report on the performance of biphasic system composed of ethyl lactate, water and inorganic salt (K3PO4, K2HPO4 and K2CO3) for the separation of amino acids (Lphenylalanine, L-tryptophan and L-tyrosine) from their aqueous solutions. Cloud points (solubility curve) and tie-lines for three ternary (ethyl la ctate + water + inorganic salt) systems at 298.2 K and 313.2 K at atmospheric pressure were determined. For certain composition range, these mixture exhibit biphasic systemstop and bottom phases rich in ethyl lactate and salt, respectively. Partition coefficients of amino acids and their extraction efficiencies, as essential parameters for design of any separation process, were measured at two temperatures-298.2 K and 313.2 K. The maximum values of partition coefficients were observed for the system containing K3PO4: 3.5, 3.7 and 11.9 for L-phenylalanine at 313.2 K, L-tyrosine at 298.2 K and L-tryptophan at 313.2 K, respectively. The obtained results clearly showed that the biphasic systems based on ethyl lactate are suitable for the efficient and sustainable recovery of amino acids from solutions with water.

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“…The aqueous biphasic system (ABS) is recognized as an environmentally friendly method, as an alternative to the traditional LLE, since both phases of the ABS are aqueous solutions, and it could be used for organic compounds [1][2][3][4][5] and biological macromolecule [6][7][8][9] extractions without using any volatile organic solvent. Up to now, ABS could be composed of polymer and salt, polymer and polymer, ionic liquid (IL) and polymer, IL and salt, IL and surfactant.…”

Section: Introductionmentioning

confidence: 99%

Extraction of bisphenol A in honey samples using aqueous biphasic systems coupled with high‐performance liquid chromatography

Tian

Bai

2018

Separation Science Plus

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An aqueous biphasic system based on cholinium propanoate and phosphate solution was developed for the fast extraction and determination of bisphenol A in honey samples. The phase diagrams of the aqueous biphasic systems with cholinium propanoate (ionic liquid) and phosphate solutions were investigated, and the biphasic regions of the aqueous biphasic systems decreased with the increase of pH values of the phosphate solutions. The aqueous biphasic system was applied for the analyte extraction. After extraction, the analyte was separated on a C18 column (150 mm × 2.1 mm i. d., 5 μm) using acetonitrile and ammonium acetate as the mobile phase. The parameters, such as the conductivity and viscosity of the ionic liquid solutions, pH values of the phosphate solutions, and extraction efficiency were optimized to achieve the excellent extraction performance. Good linearity was shown for the analyte over the tested concentration range (0.01–10.0 mg/kg) with correlation coefficient higher than 0.991. Three spiked levels (0.01, 0.05, 0.10 mg/kg) were applied for determination of the recoveries of the analyte in honey samples in the range of 78–112% with relative standard deviations of 5.5–10.2%. The limit of detection and limit of quantification for the analyte were 0.003 and 0.01 mg/kg, respectively. The developed method was applied for the determination of the analyte in real samples with high sensitivity.

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One-step extraction and concentration of estrogens for an adequate monitoring of wastewater using ionic-liquid-based aqueous biphasic systems

Cited by 46 publications

References 60 publications

Aqueous biphasic systems composed of ionic liquids and polypropylene glycol: insights into their liquid–liquid demixing mechanisms

Aqueous biphasic systems composed of ionic liquids and polypropylene glycol: insights into their liquid–liquid demixing mechanisms

Partitioning of amino acids in the novel biphasic systems based on environmentally friendly ethyl lactate

Extraction of bisphenol A in honey samples using aqueous biphasic systems coupled with high‐performance liquid chromatography

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