Analytical Applications of Ionic Liquid‐Based Surfactants in Separation Science

Trujillo−Rodríguez, María J.; González‐Hernández, Providencia; Pino, Verónica

doi:10.1002/9781118854501.ch23

Cited by 5 publications

(2 citation statements)

References 72 publications

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“…Therefore, the term "IL-based surfactants" was introduced to describe them better [33]. In general, the sensitivity enhancement by these IL-based surfactants at nonmicellar concentrations in some cases was shown to be better than conventional conventional cationic surfactants.…”

Section: Il-based Surfactants At Nonmicellar Concentrationsmentioning

confidence: 99%

“…This boundary can be created by changes in conductivity (as in field-amplified sample stacking and isotachophoresis), or changes in pH (as in dynamic pH junction), or inclusion of a pseudostationary phase (as in sweeping and micelle collapse) [22][23][24][25]. A series of biannual reviews, first published in Electrophoresis in 2007 [26] and continued in 2009 [27], 2011 [28], 2013 [29], and 2015 [30] To the best of our knowledge, some reviews and book chapters on IL-based surfactants cover the use of ILs in CE [32,33], but in the present work, for the first time, we described the applications resulted from implementing ILs in enhancing the sensitivity of CE. Figure 2 shows a chart summarizing the different modes based on ILs in enhancing the sensitivity of CE.…”

Section: Introductionmentioning

confidence: 99%

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Ionic liquids in enhancing the sensitivity of capillary electrophoresis: Off‐line and on‐line sample preconcentration techniques

2016

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The popularity of ionic liquids (ILs) has grown during the last decade in enhancing the sensitivity of CE through different off-line or on-line sample preconcentration techniques. Water-insoluble ILs were commonly used in IL-based liquid phase microextraction, in all its variants, as off-line sample preconcentration techniques combined with CE. Water-soluble ILs were rarely used in IL-based aqueous two phase system (IL-ATPS) as an off-line sample preconcentration approach combined with CE in spite of IL-ATPS predicted features such as more compatibility with CE sample injection due to its relatively low viscosity and more compatibility with CE running buffers avoid, in some cases, anion exchange precipitation. Therefore, the attentions for the key parameters affecting the performance of IL-ATPSs were generally presented and discussed. On-line CE preconcentration techniques containing IL-based surfactants at nonmicellar or micellar concentrations have become another interesting area to improve CE sensitivity and it is likely to remain a focus of the field in the endeavor because of their numerous to create rapid, simple and sensitive systems. In this article, significant contributions of ILs in enhancing the sensitivity of CE are described, and a specific overview of the relevant examples of their applications is also given.

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Section: Il-based Surfactants At Nonmicellar Concentrationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ionic liquids in enhancing the sensitivity of capillary electrophoresis: Off‐line and on‐line sample preconcentration techniques

2016

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Analytical Applications of Ionic Liquids in Chromatographic and Electrophoretic Separation Techniques

Trujillo−Rodríguez

Afonso

Pino

2015

Green Chemistry and Sustainable Technology

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Salt-induced ionic liquid-based microextraction using a low cytotoxic guanidinium ionic liquid and liquid chromatography with fluorescence detection to determine monohydroxylated polycyclic aromatic hydrocarbons in urine

et al. 2018

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A novel ionic liquid (IL)-based microextraction method has been developed for the determination of four hydroxylated polycyclic aromatic hydrocarbons (OHPAHs) in urine samples. The water soluble IL-based surfactant selected as extraction solvent is decylguanidinium chloride (CGu-Cl), the cytotoxicity and micellar behavior of which were evaluated. The proposed salt-induced IL-based preconcentration method simply consists in adding NaClO to the aqueous medium containing the IL to promote its water insolubility. The entire method was optimized, requiring the use of only 20 μL of CGu-Cl for 10 mL of diluted urine sample (1:10) without any pH adjustment, followed by the addition of NaClO to ensure a 5% (w/v) content. A cloudy solution was observed immediately, and after the application of 4 min of vortex and 8 min of centrifugation, the droplet was diluted up to 60 μL with a mixture of acetonitrile:water (30:70) and injected into the liquid chromatograph with fluorescence detection. The method was validated using both synthetic urine and human urine as matrix for the determination of the four OHPAHs. The following analytical features were obtained: detection limits down to 1 ng·L in real urine; inter-day reproducibility (as RSD in %) always lower than 17% when dealing with real urine samples spiked at 80 ng·L; and average relative recoveries of 102% in real urine samples at such low spiked levels. Despite the simplicity of the proposed method, it performed successfully with complex urine samples. Graphical abstract Salt-induced IL-based microextraction using a low cytotoxic IL for mono-OHPAHs in urine.

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Analytical Applications of Ionic Liquid‐Based Surfactants in Separation Science

Cited by 5 publications

References 72 publications

Ionic liquids in enhancing the sensitivity of capillary electrophoresis: Off‐line and on‐line sample preconcentration techniques

Ionic liquids in enhancing the sensitivity of capillary electrophoresis: Off‐line and on‐line sample preconcentration techniques

Analytical Applications of Ionic Liquids in Chromatographic and Electrophoretic Separation Techniques

Salt-induced ionic liquid-based microextraction using a low cytotoxic guanidinium ionic liquid and liquid chromatography with fluorescence detection to determine monohydroxylated polycyclic aromatic hydrocarbons in urine

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