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Description
One promising solution for the development of greener chemical processes is the utilization of reversible CO2- switchable hydrophilicity solvents (CO2-SHSs) that offer an energy-friendly alternative to solvents with fixed solvation properties. CO2-SHS have been used in microfluidic platforms for the enrichment of nonsteroidal antiinflammatory drugs in water, in liquid-liquid microextractions for the determination of flavonoids in food samples, to cite some exemples. [1] [2] [3] All these utilisations include porous materials where the use of CO2-SHS is of great interest. The use of these solvents needs efficient interactions between the solvent and the trigger as mass transfer issues can significantly affect efficiency. In this study, a novel approach for fast investigation of SHS performances is proposed by employing 2-2-dibutylaminoethanol (DBAE) as a known CO2-SHS within a continuous microfluidic device made of poly(dimethylsiloxane) (PDMS), which can be assimilated to a pore.
The method proposed allowed the examination of mass transport in the phase change reaction and a considerable reduction of the time required for the phenomenon to occur to subminute time scales.
A proof of concept is presented for the extraction of soybean oil from a soybean oil/DBAE mixture, which paves the way for the development of continuous microfluidic liquid−liquid extraction processes from porous matrices. In addition to this study, spectroscopic analyses conducted on DBAE under a CO2 atmosphere also revealed that water is unnecessary for initiating the switch of DBAE into a hydrophilic compound, implying the existence of an additional reaction pathway. This finding could extend the potential applications of DBAE as an SHS to hydrophilic solvents other than water. [4]
Bibliographie
[1] X. Di, X. Zhao et X. Guo, «Dispersive micro-solid phase extraction combined with switchable hydrophilicity solvent-based homogeneous liquid-liquid microextraction for enrichment of non-steroidal anti- inflammatory drugs in environmental water samples.,» J. Chromatogr. A 2020, 1634, 46, vol. 1634, p. 461677, 2020.
[2] M. Hassan, F. Uzcan, N. S. Shah, U. Alshana et M. Soylak, «Switchable-hydrophilicity solvent liquid-liquid microextraction for sample cleanup prior to dispersive magnetic solid-phase micro- extraction for spectrophotometric determination of quercetin in food samples.,» Sustainable Chem. Pharm. , vol. 22, p. 100480, 2021.
[3] U. Alshana, M. Hassan, M. Al-Nidawi, E. Yilmaz et M. Soylak, «Switchable-hydrophilicity solvent liquid−liquid microextraction com- bined with smartphone digital image colorimetry for the determination of palladium in catalytic converters.,» Trends Anal. Chem., vol. 131, n° %1116025, 2020.
[4] M. Zollo, T. Tassaing. J.-B. S.almon Y. Medina.-Gonzalez, «Toward Liquid−Liquid Extraction Using Switchable Hydrophilicity Solvents in Microfluidic Poly(dimethylsiloxane) Chips,» ACS sust. Chem. and Engineering. , vol. 12, pp. 15491-15501, 2024.
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