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Aredes RS, Lima IDP, Faillace AP, Madriaga VGC, Lima TDM, Vaz FAS, Marques FFDC, Duarte LM. From capillaries to microchips, green electrophoretic features for enantiomeric separations: A decade review (2013-2022). Electrophoresis 2023; 44:1471-1518. [PMID: 37667860 DOI: 10.1002/elps.202200178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 06/28/2023] [Accepted: 07/12/2023] [Indexed: 09/06/2023]
Abstract
Enantioseparation by the electromigration-based method is well-established and widely discussed in the literature. Electrophoretic strategies have been used to baseline resolve complex enantiomeric mixtures, typically using a selector substance into the background electrolyte (BGE) from capillaries to microchips. Along with developing new materials/substances for enantioseparations, it is the concern about the green analytical chemistry (GAC) principles for method development and application. This review article brings a last decade's update on the publications involving enantioseparation by electrophoresis for capillary and microchip systems. It also brings a critical discussion on GAC principles and new green metrics in the context of developing an enantioseparation method. Chemical and green features of native and modified cyclodextrins are discussed. Still, given the employment of greener substances, ionic liquids and deep-eutectic solvents are highlighted, and some new selectors are proposed. For all the mentioned selectors, green features about their production, application, and disposal are considered. Sample preparation and BGE composition in GAC perspective, as well as greener derivatization possibilities, were also addressed. Therefore, one of the goals of this review is to aid the electrophoretic researchers to look where they have not.
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Affiliation(s)
- Rafaella S Aredes
- Programa, de Pós-Graduação em Química, Departamento de Química Analítica, Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil
| | - Isabela de P Lima
- Programa, de Pós-Graduação em Química, Departamento de Química Analítica, Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil
| | - Amanda P Faillace
- Programa, de Pós-Graduação em Química, Departamento de Química Analítica, Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil
| | - Vinicius G C Madriaga
- Programa, de Pós-Graduação em Química, Departamento de Química Analítica, Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil
| | - Thiago de M Lima
- Programa, de Pós-Graduação em Química, Departamento de Química Analítica, Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil
| | - Fernando A S Vaz
- Programa, de Pós-Graduação em Química, Departamento de Química Analítica, Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil
| | - Flávia F de C Marques
- Programa, de Pós-Graduação em Química, Departamento de Química Analítica, Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil
| | - Lucas M Duarte
- Programa, de Pós-Graduação em Química, Departamento de Química Analítica, Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil
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Ioannou KA, Ioannou GD, Christou A, Stavrou IJ, Schmid MG, Kapnissi-Christodoulou CP. The potential of the use of deep eutectic solvents and amino acid-based ionic liquids to enhance the chiral discrimination ability of different chiral selectors in capillary electrophoresis. J Chromatogr A 2023; 1705:464152. [PMID: 37327715 DOI: 10.1016/j.chroma.2023.464152] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 06/08/2023] [Accepted: 06/11/2023] [Indexed: 06/18/2023]
Abstract
The effect of the combined use of amino acid-based ionic liquids (AAILs) and deep eutectic solvents (DESs) with either cyclodextrin- (CD) or cyclofructan- (CF) based chiral selectors for the chiral separation of amphetamine derivatives was investigated in the present study. A non-significant improvement in enantiomeric separation of target analytes was observed when AAILs were combined with either CF or CD. On the other side, a markedly improved chiral separation of enantiomers was obtained using the dual carboxymethyl-β-cyclodextrin/DES system, highlighting the existence of a synergistic effect. After the addition of 0.5% v/v of choline chloride-ethylene glycol, the resolution of the enantiomers of amphetamine, methamphetamine and 3-fluorethamphetamine, increased from 1.4, 1.1, 1.0 to 1.8, 1.8, and 1.5 min, and the analysis times increased from 19.54, 20.48, 18.71 to 35.71, 35.78 and 32.90 min, respectively. This was not the case for the CF/DES dual system, in which the separation of amphetamines worsened, indicating an antagonistic effect. In conclusion, DESs are a very promising additive in capillary electrophoresis that can improve the separation of chiral molecules in combination with CDs but not CFs.
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Affiliation(s)
| | | | | | - Ioannis J Stavrou
- Department of Life Sciences, European University Cyprus, 2404 Nicosia, Cyprus
| | - Martin G Schmid
- Department of Pharmaceutical Chemistry, Institute of Pharmaceutical Sciences, University of Graz, 8010 Graz, Austria
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3
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Ángeles García M, Jiménez-Jiménez S, Marina ML. STEREOSELECTIVE SEPARATION OF DIMETHENAMID BY CYCLODEXTRIN ELECTROKINETIC CHROMATOGRAPHY USING DEEP EUTECTIC SOLVENTS. J Chromatogr A 2022; 1673:463114. [DOI: 10.1016/j.chroma.2022.463114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 04/29/2022] [Accepted: 05/02/2022] [Indexed: 11/29/2022]
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4
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Effect of ionic liquids and deep eutectic solvents on the enantiomeric separation of clopidogrel by cyclodextrin-electrokinetic chromatography. Quantitative analysis in pharmaceutical formulations using tetrabutylammonium l-aspartic acid combined with carboxymethyl-γ-cyclodextrin. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106815] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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5
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Christou A, Stavrou IJ, Kapnissi-Christodoulou CP. Continuous and pulsed ultrasound-assisted extraction of carob's antioxidants: Processing parameters optimization and identification of polyphenolic composition. ULTRASONICS SONOCHEMISTRY 2021; 76:105630. [PMID: 34146974 PMCID: PMC8220390 DOI: 10.1016/j.ultsonch.2021.105630] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/27/2021] [Accepted: 06/10/2021] [Indexed: 05/19/2023]
Abstract
Polyphenols in carobs have recently attracted great attention due to their wide range of biological and health promoting effects. A comprehensive study was conducted to find an optimum method for the extraction, purification and characterization of these valuable bioactive substances. Under this framework, the ultrasound-assisted extraction (UAE) of polyphenols from carob pulp was optimized by the maximization of the yield in total phenolics using response surface methodology. In particular, the effects of solid-solvent ratio, solvent concentration, extraction time, sonication amplitude, and sonication mode were investigated and optimized using a complete experimental design. In comparison to conventional extraction techniques, UAE offered a higher yield of antioxidants and a shorter processing time. Solid-phase extraction was evaluated as a clean-up strategy prior to the electrophoretic analysis of extracts. The results from the analysis of real samples revealed the predominance of gallic acid and highlighted the great influence of the ripening stage on carobs composition.
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Affiliation(s)
| | - Ioannis J Stavrou
- Department of Life Sciences, European University Cyprus, 2404 Nicosia, Cyprus
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Christou A, Stavrou IJ, Kapnissi-Christodoulou CP. Combined use of β-cyclodextrin and ionic liquid as electrolyte additives in EKC for separation and determination of carob's phenolics-A study of the synergistic effect. Electrophoresis 2021; 42:1945-1955. [PMID: 34240758 DOI: 10.1002/elps.202100085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 06/25/2021] [Accepted: 06/29/2021] [Indexed: 11/11/2022]
Abstract
In this work, a simple, reliable, and fast capillary electrophoretic method was developed and validated for the simultaneous determination of 12 polyphenolic compounds, the most frequently found in carob's pulp and seeds. The present work deals with the development of a novel dual electrophoretic system based on the combined use of β-CD and ionic liquid (IL) as buffer additives. A baseline separation of the target analytes was achieved in less than 10 min by using a BGE consisting of 35 mM borate along with 15 mM β-CD and 3 mM l-alanine tert butyl ester lactate (l-AlaC4 Lac) IL as buffer additives at pH 9.5, a temperature of 25°C, and an applied voltage of 30 kV. The application of the developed electrophoretic method to real samples enabled the identification and quantification of the main phenolic constituents of both ripe and unripe carob pulp extracts. The results revealed the predominance of gallic acid in both ripe (183.92 μg/g carob pulp) and unripe (205.10 μg/g carob pulp) carob pulp and highlighted the great influence of the ripening stage on carobs polyphenolic composition, with unripe pods being more enriched in polyphenols (total phenolics detected: 912.58 and 283.13 μg/g unripe and ripe carob pulp).
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Affiliation(s)
| | - Ioannis J Stavrou
- Department of Life Sciences, European University Cyprus, Nicosia, Cyprus
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Effects of amino acid-derived chiral ionic liquids on cyclodextrin-mediated capillary electrophoresis enantioseparations of dipeptides. J Chromatogr A 2021; 1652:462342. [PMID: 34174715 DOI: 10.1016/j.chroma.2021.462342] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 06/03/2021] [Accepted: 06/08/2021] [Indexed: 11/20/2022]
Abstract
The synergistic effect of chiral ionic liquids composed of tetraalkylammonium ions and the amino acids Asn, Asp or Pro on the enantioseparations of dipeptides mediated by β-cyclodextrin and 2-hydroxypropyl-β-cyclodextrin in capillary electrophoresis was studied. Addition of a chiral ionic liquid resulted in a concentration-dependent increase in the enantioresolutions compared to the sole presence of a cyclodextrin in the background electrolyte. The extent varied with the tetraalkylammonium cation (tetramethylammonium versus tetrabutylammonium) as well as the amino acid component of the ionic liquid. The presence of a chiral ionic liquid did not counteract the pH-dependent reversal of the enantiomer migration order of the dipeptides Ala-Phe, Ala-Tyr and Phe-Phe when increasing the pH of the background electrolyte from 2.5 to 3.5. Comparing the effect of a chiral ionic liquid based on Asp with the addition of equimolar concentrations of the individual components of the ionic liquid, a diverse picture was observed. In some cases, higher resolution values were obtained with the chiral ionic liquid, while for other cases superior enantioseparations were obtained upon separate addition of the amino acid component and a tetraalkylammonium chloride. With regard to the stereochemistry of the amino acid, a superior effect was typically observed using the l-configured amino acid, but in some cases higher resolution values were found in the presence of d-Asp. The rationale for the diverse observations is not obvious and may be due to the zwitterionic nature of analytes as well as the amino acid component of the chiral ionic liquid.
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Wu D, Ma C, Fan GC, Pan F, Tao Y, Kong Y. Recent advances of the ionic chiral selectors for chiral resolution by chromatography, spectroscopy and electrochemistry. J Sep Sci 2021; 45:325-337. [PMID: 34117714 DOI: 10.1002/jssc.202100334] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/08/2021] [Accepted: 06/08/2021] [Indexed: 01/06/2023]
Abstract
Ionic chiral selectors have been received much attention in the field of asymmetric catalysis, chiral recognition, and preparative separation. It has been shown that the addition of ionic chiral selectors can enhance the recognition efficiency dramatically due to the presence of multiple intermolecular interactions, including hydrogen bond, π-π interaction, van der Waals force, electrostatic ion-pairing interaction, and ionic-hydrogen bond. In the initial research stage of the ionic chiral selectors, most of work center on the application in chromatographic separation (capillary electrophoresis, high-performance liquid chromatography, and gas chromatography). Differently, more and more attention has been paid on the spectroscopy (nuclear magnetic resonance, fluorescence, ultraviolet and visible absorption spectrum, and circular dichroism spectrum) and electrochemistry in recent years. In this tutorial review as regards the ionic chiral selectors, we discuss in detail the structural features, properties, and their application in chromatography, spectroscopy, and electrochemistry.
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Affiliation(s)
- Datong Wu
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, P. R. China
| | - Cong Ma
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, P. R. China
| | - Gao-Chao Fan
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, Shandong Key Laboratory of Biochemical Analysis, Qingdao University of Science and Technology, Qingdao, P. R. China
| | - Fei Pan
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, P. R. China
| | - Yongxin Tao
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, P. R. China
| | - Yong Kong
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, P. R. China
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El Deeb S, Silva CF, Junior CSN, Hanafi RS, Borges KB. Chiral Capillary Electrokinetic Chromatography: Principle and Applications, Detection and Identification, Design of Experiment, and Exploration of Chiral Recognition Using Molecular Modeling. Molecules 2021; 26:2841. [PMID: 34064769 PMCID: PMC8151978 DOI: 10.3390/molecules26102841] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/04/2021] [Accepted: 05/07/2021] [Indexed: 12/19/2022] Open
Abstract
This work reviews the literature of chiral capillary electrokinetic chromatography from January 2016 to March 2021. This is done to explore the state-of-the-art approach and recent developments carried out in this field. The separation principle of the technique is described and supported with simple graphical illustrations, showing migration under normal and reversed polarity modes of the separation voltage. The most relevant applications of the technique for enantioseparation of drugs and other enantiomeric molecules in different fields using chiral selectors in single, dual, or multiple systems are highlighted. Measures to improve the detection sensitivity of chiral capillary electrokinetic chromatography with UV detector are discussed, and the alternative aspects are explored, besides special emphases to hyphenation compatibility to mass spectrometry. Partial filling and counter migration techniques are described. Indirect identification of the separated enantiomers and the determination of enantiomeric migration order are mentioned. The application of Quality by Design principles to facilitate method development, optimization, and validation is presented. The elucidation and explanation of chiral recognition in molecular bases are discussed with special focus on the role of molecular modeling.
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Affiliation(s)
- Sami El Deeb
- Institute of Medicinal and Pharmaceutical Chemistry, Technische Universität Braunschweig, 38106 Braunschweig, Germany
| | - Camilla Fonseca Silva
- Departamento de Ciências Naturais, Campus Dom Bosco, Universidade Federal de São João del-Rei (UFSJ), Praça Dom Helvécio 74, Fábricas, São João del-Rei 36301-160, Minas Gerais, Brazil; (C.F.S.); (C.S.N.J.); (K.B.B.)
| | - Clebio Soares Nascimento Junior
- Departamento de Ciências Naturais, Campus Dom Bosco, Universidade Federal de São João del-Rei (UFSJ), Praça Dom Helvécio 74, Fábricas, São João del-Rei 36301-160, Minas Gerais, Brazil; (C.F.S.); (C.S.N.J.); (K.B.B.)
| | - Rasha Sayed Hanafi
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, German University in Cairo, Cairo 11835, Egypt;
| | - Keyller Bastos Borges
- Departamento de Ciências Naturais, Campus Dom Bosco, Universidade Federal de São João del-Rei (UFSJ), Praça Dom Helvécio 74, Fábricas, São João del-Rei 36301-160, Minas Gerais, Brazil; (C.F.S.); (C.S.N.J.); (K.B.B.)
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Mező E, Páger C, Makszin L, Kilár F. Capillary zone electrophoresis of proteins applying ionic liquids for dynamic coating and as background electrolyte component. Electrophoresis 2020; 41:2083-2091. [PMID: 33022798 DOI: 10.1002/elps.202000204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 09/22/2020] [Accepted: 09/24/2020] [Indexed: 11/07/2022]
Abstract
The use of ionic liquids in capillary electrophoresis, either as coating material or as components of the background electrolyte needs systematic standardization to set up optimal conditions. Excellent separation of the proteins was achieved using 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4 ]) or 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4 ]) ionic liquids using the properly made ionic-liquid-water binary mixtures for the experiments. The binary mixture has a distinctly stable and well perceptible low pH, which depends on the concentration of the ionic liquid, and on the preparation time of the mixture. Optimal conditions for the electrophoretic separation were obtained upon a multivariate analysis of the experimental parameters (applied voltage, migration time, concentration, and type of the ionic liquid). The standardized condition provides a low electroendosmotic flow toward the anode, which, however, did not hinder the proteins to migrate toward the cathode. The migration of cytochrome c, lysozyme, myoglobin, trypsin, and apo-transferrin at a pH around 2, far below the isoelectric points of the proteins, showed RSD values of the migration times less than 7.5% and less than 6.5% when using [emim][BF4 ] or [bmim][BF4 ], respectively, either in run-to-run or day-to-day experiments. The determination of the extent of the EOF is not possible with the commonly used EOF markers, due to interaction with the ionic-liquid constituents. The interaction of the ionic liquids with the proteins influences the migration order in zone electrophoresis. This method has been applied successfully for the analyses of real biological samples such as proteins from egg whites and human tears.
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Affiliation(s)
- Emerencia Mező
- Institute of Bioanalysis, Medical School, and Szentágothai Research Center, University of Pécs, Pécs, Hungary
| | - Csilla Páger
- Institute of Bioanalysis, Medical School, and Szentágothai Research Center, University of Pécs, Pécs, Hungary
- Department of Analytical and Environmental Chemistry, Faculty of Sciences, University of Pécs, Pécs, Hungary
| | - Lilla Makszin
- Institute of Bioanalysis, Medical School, and Szentágothai Research Center, University of Pécs, Pécs, Hungary
| | - Ferenc Kilár
- Institute of Bioanalysis, Medical School, and Szentágothai Research Center, University of Pécs, Pécs, Hungary
- Department of Bioengineering, Sapientia Hungarian University of Transylvania, Miercurea Ciuc, Romania
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Nie L, Yohannes A, Yao S. Recent advances in the enantioseparation promoted by ionic liquids and their resolution mechanisms. J Chromatogr A 2020; 1626:461384. [PMID: 32797857 DOI: 10.1016/j.chroma.2020.461384] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 06/28/2020] [Accepted: 06/30/2020] [Indexed: 12/16/2022]
Abstract
More and more various chemical media are being applied in enantioseparation; among them, ionic liquids (ILs) have attracted the long-term attention in this decade as green designable solvents. This paper provides comprehensive overview for the applications of ILs in chiral extraction, gas chromatography, liquid chromatography, capillary electrophoresis and other techniques for enantioseparation. Additionally, the important resolution mechanisms based on ILs have also been summarized and discussed. This review focuses on the latest development of enantioseparation methods by using ILs in various modes, leading to meaningful and valuable information to related fields and thus promotes further research and application of reported methods.
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Affiliation(s)
- Lirong Nie
- School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China
| | - Alula Yohannes
- School of Chemical Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu 610065, China
| | - Shun Yao
- School of Chemical Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu 610065, China.
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Flieger J, Feder-Kubis J, Tatarczak-Michalewska M. Chiral Ionic Liquids: Structural Diversity, Properties and Applications in Selected Separation Techniques. Int J Mol Sci 2020; 21:E4253. [PMID: 32549300 PMCID: PMC7352568 DOI: 10.3390/ijms21124253] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 06/10/2020] [Accepted: 06/12/2020] [Indexed: 12/21/2022] Open
Abstract
Ionic liquids (ILs) are chemical compounds composed of ions with melting points below 100 °C exhibiting a design feature. ILs are commonly used as the so-called green solvents, reagents or highly efficient catalysts in varied chemical processes. The huge application potential of ionic liquids (IL) justifies the growing interest in these compounds. In the last decade, increasing attention has been devoted to the development of new methods in the synthesis of stable chiral ionic liquids (CILs) and their application in various separation techniques. The beginnings of the successful use of CILs to separate enantiomers date back to the 1990 s. Most chiral ILs are based on chiral cations or chiral anions. There is also a limited number of CILs possessing both a chiral cation and a chiral anion. Due to the high molecular diversity of both ions, of which at least one has a chiral center, we have the possibility to design a large variety of optically active structures, thus expanding the range of CIL applications. Research utilizing chiral ionic liquids only recently has become more popular. However, it is the area that still has great potential for future development. This review aimed to describe the diversity of structures, properties and examples of applications of chiral ionic liquids as new chiral solid materials and chiral components of the anisotropic environment, providing chiral recognition of enantiomeric analytes, which is useful in liquid chromatography, countercurrent chromatography and other various CIL-based extraction techniques including aqueous biphasic (ABS) extraction systems, solid-liquid two-phase systems, liquid-liquid extraction systems with hydrophilic CILs, liquid-liquid extraction systems with hydrophobic CILs, solid-phase extraction and induced-precipitation techniques developed in the recent years. The growing demand for pure enantiomers in the pharmaceutical and food industries sparks further development in the field of extraction and separation systems modified with CILs highlighting them as affordable and environmentally friendly both chiral selectors and solvents.
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Affiliation(s)
- Jolanta Flieger
- Department of Analytical Chemistry, Medical University of Lublin, 20-093 Lublin, Poland;
| | - Joanna Feder-Kubis
- Department of Process Engineering and Technology of Polymer and Carbon Materials, Faculty of Chemistry, Wrocław University of Science and Technology, 50-370 Wrocław, Poland;
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Ma X, Du Y, Zhu X, Yang J. Visual chiral recognition of aromatic amino acids with (S)-mandelic acid-based ionic liquids via complexation. Talanta 2020; 217:121083. [PMID: 32498868 DOI: 10.1016/j.talanta.2020.121083] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Revised: 04/21/2020] [Accepted: 04/22/2020] [Indexed: 01/04/2023]
Abstract
Recently, chiral ionic liquids have attracted increasing attention in analytical chemistry. However, only a few papers focus on the application of them in visual chiral recognition. Herein, two functionalized chiral ionic liquids derived from (S)-mandelic acid (1-butyl-3-methylimidazolium mandelate, CIL1 and N-butyl-N-methylpyrrolidinium mandelate, CIL2) were prepared for visual chiral recognition of aromatic amino acids for the first time. In the presence of Cu(II) and appropriate solvents, visual enantiomeric responses of phenylalanine, tryptophane, tyrosine and phenylglycine were observed. Relying on solubility or color differences, all chiral recognition could be finished within 5 min. The potential mechanism was investigated by means of infrared spectroscopy, ultraviolet spectroscopy, thermal gravity analysis, elemental analysis and scanning electron microscope. Results revealed that CuSO4 interacted with CIL1 and D-tryptophane in the ratio of 1:1.96:0.43 in relevant precipitate, and the different stability of complex was responsible for the chiral recognition. In addition, resolution of racemic tryptophane was performed, which offered excellent enantiomeric excess values (94.2% for CIL1 and 95.1% for CIL2 in solid phase). The proposed ionic liquids had strong enantioselectivity for aromatic amino acids and great potential in visual chiral recognition.
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Affiliation(s)
- Xiaofei Ma
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education), China Pharmaceutical University, Nanjing, 210009, PR China; State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, PR China
| | - Yingxiang Du
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education), China Pharmaceutical University, Nanjing, 210009, PR China; State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, PR China.
| | - Xinqi Zhu
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education), China Pharmaceutical University, Nanjing, 210009, PR China; State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, PR China
| | - Jiangxia Yang
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education), China Pharmaceutical University, Nanjing, 210009, PR China; State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, PR China
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Xu H, Du Y, Feng Z, Sun X, Liu J. Synthesis of a chiral ionic liquid, cholinium-clindamycin phosphate, as sole chiral selector in capillary electrophoresis. J Chromatogr A 2020; 1615:460721. [DOI: 10.1016/j.chroma.2019.460721] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 11/13/2019] [Accepted: 11/16/2019] [Indexed: 12/21/2022]
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15
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Synthesis and application of tetramethylammonium-carboxymethylated-β-cyclodextrin: A novel ionic liquid in capillary electrophoresis enantioseparation. J Pharm Biomed Anal 2020; 180:113030. [DOI: 10.1016/j.jpba.2019.113030] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 11/28/2019] [Accepted: 12/04/2019] [Indexed: 12/25/2022]
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16
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Xu H, Feng Z, Du Y. Synthesis, application and molecular modeling study of ionic liquid functionalized lactobionic acid, 3-methyl-1-(3-sulfopropyl)-1H-imidazol-3-ium lactobionate, as a chiral selector in capillary electrophoresis. Analyst 2020; 145:1025-1032. [DOI: 10.1039/c9an02009h] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Ionic liquid MSI-LA was used as the sole chiral selector, both cation and anion contribute in forming interactions with enantiomers.
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Affiliation(s)
- Hui Xu
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education)
- China Pharmaceutical University
- Nanjing 210009
- P. R. China
- State Key Laboratory of Natural Medicines
| | - Zijie Feng
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education)
- China Pharmaceutical University
- Nanjing 210009
- P. R. China
- State Key Laboratory of Natural Medicines
| | - Yingxiang Du
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education)
- China Pharmaceutical University
- Nanjing 210009
- P. R. China
- State Key Laboratory of Natural Medicines
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17
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Xue S, Ren S, Wang L, Zhang Q. Evaluation of tetraalkylammonium amino acid ionic liquids as chiral ligands in ligand-exchange capillary electrophoresis. J Chromatogr A 2020; 1611:460579. [DOI: 10.1016/j.chroma.2019.460579] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 09/02/2019] [Accepted: 09/29/2019] [Indexed: 12/22/2022]
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18
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Ma X, Du Y, Sun X, Liu J, Huang Z. Synthesis and application of amino alcohol-derived chiral ionic liquids, as additives for enantioseparation in capillary electrophoresis. J Chromatogr A 2019; 1601:340-349. [DOI: 10.1016/j.chroma.2019.04.040] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Revised: 04/12/2019] [Accepted: 04/14/2019] [Indexed: 12/20/2022]
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19
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Liu J, Du Y, Sun X, Feng Z, Ma X, Li J. Synthesis and application of amino triazolium-modified lactobionic acid as chiral selector in capillary electrophoresis. J Chromatogr A 2019; 1594:199-207. [DOI: 10.1016/j.chroma.2019.02.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 01/28/2019] [Accepted: 02/03/2019] [Indexed: 02/07/2023]
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20
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Greño M, Salgado A, Castro‐Puyana M, Marina ML. Nuclear magnetic resonance to study the interactions acting in the enantiomeric separation of homocysteine by capillary electrophoresis with a dual system of γ‐cyclodextrin and the chiral ionic liquid EtCholNTf2. Electrophoresis 2019; 40:1913-1920. [DOI: 10.1002/elps.201800483] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 03/15/2019] [Accepted: 03/18/2019] [Indexed: 12/22/2022]
Affiliation(s)
- Maider Greño
- Departamento de Química AnalíticaQuímica Física e Ingeniería Química. Facultad de CienciasUniversidad de Alcalá. Ctra. Alcalá de Henares Madrid Spain
| | - Antonio Salgado
- Centro de Espectroscopía de Resonancia Magnética Nuclear (CERMN)Centro de Apoyo a la Investigación en QuímicaUniversidad de Alcalá Ctra. Madrid Spain
| | - María Castro‐Puyana
- Departamento de Química AnalíticaQuímica Física e Ingeniería Química. Facultad de CienciasUniversidad de Alcalá. Ctra. Alcalá de Henares Madrid Spain
- Instituto de Investigación Química Andrés M. del Río. Universidad de Alcalá. Ctra. Madrid‐Barcelona Alcalá de Henares Madrid Spain
| | - María Luisa Marina
- Departamento de Química AnalíticaQuímica Física e Ingeniería Química. Facultad de CienciasUniversidad de Alcalá. Ctra. Alcalá de Henares Madrid Spain
- Instituto de Investigación Química Andrés M. del Río. Universidad de Alcalá. Ctra. Madrid‐Barcelona Alcalá de Henares Madrid Spain
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21
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Sun X, Liu K, Du Y, Liu J, Ma X. Investigation of the enantioselectivity of tetramethylammonium-lactobionate chiral ionic liquid based dual selector systems toward basic drugs in capillary electrophoresis. Electrophoresis 2019; 40:1921-1930. [DOI: 10.1002/elps.201800422] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 01/15/2019] [Accepted: 01/15/2019] [Indexed: 01/03/2023]
Affiliation(s)
- Xiaodong Sun
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
| | - Kang Liu
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
| | - Yingxiang Du
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education); China Pharmaceutical University; Nanjing P. R. China
- State Key Laboratory of Natural Medicines; China Pharmaceutical University; Nanjing P. R. China
| | - Jie Liu
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
| | - Xiaofei Ma
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
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22
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Hussain A, AlAjmi MF, Hussain I, Ali I. Future of Ionic Liquids for Chiral Separations in High-Performance Liquid Chromatography and Capillary Electrophoresis. Crit Rev Anal Chem 2018; 49:289-305. [DOI: 10.1080/10408347.2018.1523706] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Afzal Hussain
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Mohamed F. AlAjmi
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Iqbal Hussain
- Department of General Studies, Jubail Industrial College, Jubail Industrial City, Saudi Arabia
| | - Imran Ali
- Department of Chemistry, College of Sciences, Taibah University, Al-Medina, Al-Munawara, Saudi Arabia
- Department of Chemistry, Jamia Millia Islamia (Central University), New Delhi, India
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23
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Nicolaou AG, Mavroudi MC, Stavrou IJ, Weatherly CA, Kapnissi-Christodoulou CP. Synergistic enantioseparation systems with either cyclodextrins or cyclofructans and L-alanine Tert butyl ester lactate. Electrophoresis 2018; 40:539-546. [PMID: 30450594 DOI: 10.1002/elps.201800257] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 10/18/2018] [Accepted: 11/13/2018] [Indexed: 11/06/2022]
Abstract
The combined use of chiral ionic liquids (CILs) and conventional chiral selectors (CSs) in CE, to establish a synergistic system, has proven to be an effective approach for the separation of enantiomeric pairs. In this study, a new CE method was developed, employing a binary system of a CS, either a cyclodextrin (CD) or a cyclofructan (CF), and a chiral amino acid ester-based ionic liquid (AAIL), for the chiral separation of four basic, acidic and zwitterionic drug compounds. In particular, the enantioseparation of two anticoagulants, warfarin (WAR) and coumachlor (COU), a non-opioid analgesic, nefopam (NEF) and a third-generation antihistamine, fexofenadine (FXD), was examined, by supporting the BGE with a CS and the chiral AAIL L-alanine tert butyl ester lactate (L-AlaC4 Lac). Parameters, such as the type of the CS, the concentration of both the CS and L-AlaC4 Lac, and the BGE pH, were methodically examined in order to optimize the chiral separation of each analyte. It was observed that, in some cases, the addition of the AAIL into the BGE improved both resolution (Rs ) and efficiency (N) significantly. In other cases, the synergistic effect enabled baseline separation of analyte enantiomers, at a much lower concentration of the CS. Finally, after optimization of separation conditions, baseline separations (Rs >1.5) of all four analytes were achieved in less than 5 min.
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24
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Zhang Q, Zhang J, Xue S, Rui M, Gao B, Li A, Bai J, yin Z, Anochie EM. Enhanced enantioselectivity of native α-cyclodextrins by the synergy of chiral ionic liquids in capillary electrophoresis. J Sep Sci 2018; 41:4525-4532. [DOI: 10.1002/jssc.201800792] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Revised: 09/30/2018] [Accepted: 10/08/2018] [Indexed: 01/12/2023]
Affiliation(s)
- Qi Zhang
- School of Pharmacy; Jiangsu University; Zhenjiang 212013 P. R. China
| | - Jian Zhang
- School of Pharmacy; Jiangsu University; Zhenjiang 212013 P. R. China
| | - Song Xue
- Department of Pharmacy; Affiliated Hospital of Jiangsu University; Zhenjiang 212013 P. R. China
| | - Mengjie Rui
- School of Pharmacy; Jiangsu University; Zhenjiang 212013 P. R. China
| | - Bin Gao
- School of Pharmacy; Jiangsu University; Zhenjiang 212013 P. R. China
| | - Ang Li
- School of Pharmacy; Jiangsu University; Zhenjiang 212013 P. R. China
| | - Jiashuai Bai
- School of Pharmacy; Jiangsu University; Zhenjiang 212013 P. R. China
| | - Zhichao yin
- School of Pharmacy; Jiangsu University; Zhenjiang 212013 P. R. China
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25
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Chalavi S, Fakhari AR, Nojavan S, Mirzaei P. Evaluation of the synergistic effect with amino acids for enantioseparation of basic drugs using capillary electrophoresis. Electrophoresis 2018; 39:2202-2209. [DOI: 10.1002/elps.201800128] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 05/19/2018] [Accepted: 05/31/2018] [Indexed: 12/24/2022]
Affiliation(s)
- Soheila Chalavi
- Faculty of Chemistry; Shahid Beheshti University; Tehran I. R. Iran
| | - Ali Reza Fakhari
- Faculty of Chemistry; Shahid Beheshti University; Tehran I. R. Iran
| | - Saeed Nojavan
- Faculty of Chemistry; Shahid Beheshti University; Tehran I. R. Iran
| | - Peyman Mirzaei
- Faculty of Chemistry; Shahid Beheshti University; Tehran I. R. Iran
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26
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Wang Z, Guo H, Chen M, Zhang G, Chang R, Chen A. Separation and determination of corynoxine and corynoxine B using chiral ionic liquid and hydroxypropyl-β-cyclodextrin as additives by field-amplified sample stacking in capillary electrophoresis. Electrophoresis 2018; 39:2195-2201. [PMID: 29947080 DOI: 10.1002/elps.201800129] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 05/17/2018] [Accepted: 05/20/2018] [Indexed: 02/03/2023]
Abstract
A sensitive, fast, and effective method, field-amplified sample stacking (FASS) in capillary electrophoresis, has been established for the separation and determination of corynoxine and corynoxine B. Hydroxypropyl-β-CD (HP-β-CD) and tetrabutylammonium-L-glutamic acid (TBA-L-Glu) were used as additives in the separation system. Electrokinetic injection was chosen to introduce sample from inlet at 10 kV for 50 s after a water plug (0.5 psi, 4 s) was injected to permit FASS. The running buffer (pH 6.1) was composed of 40 mM sodium dihydrogen phosphate solution, 130 mM HP-β-CD, and 10 mM TBA-L-Glu and the separation voltage was 20 kV. Under the optimum conditions, corynoxine and corynoxine B were successfully enriched and separated within 12 min and the sensitivity was improved approximately by 700-900 folds. Calibration curves were in a good linear relationship within the range of 62.5-5.00 × 103 ng/mL for both corynoxine and corynoxine B. The limits of detection (S/N = 3) and quantitation (S/N = 10) were 14.9, 45.2 ng/mL for corynoxine and 11.2, 34.5 ng/mL for corynoxine B, respectively. Finally, this method was successfully applied for the determination of corynoxine and corynoxine B in the stems with hooks of Uncaria rhynchophylla and its formulations.
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Affiliation(s)
- Zhiying Wang
- College of Pharmacy, Shanxi Medical University, Taiyuan, P. R. China
| | - Haitao Guo
- College of Pharmacy, Shanxi Medical University, Taiyuan, P. R. China
| | - Meng Chen
- College of Pharmacy, Shanxi Medical University, Taiyuan, P. R. China
| | - Guangbin Zhang
- College of Pharmacy, Shanxi Medical University, Taiyuan, P. R. China
| | - Ruimiao Chang
- College of Pharmacy, Shanxi Medical University, Taiyuan, P. R. China
| | - Anjia Chen
- College of Pharmacy, Shanxi Medical University, Taiyuan, P. R. China
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27
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Greño M, Marina ML, Castro-Puyana M. Enantioseparation by Capillary Electrophoresis Using Ionic Liquids as Chiral Selectors. Crit Rev Anal Chem 2018; 48:429-446. [PMID: 29641220 DOI: 10.1080/10408347.2018.1439365] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Capillary electrophoresis (CE) is one of the most widely employed analytical techniques to achieve enantiomeric separations. In spite of the fact that there are many chiral selectors commercially available to perform enantioseparations by CE, one of the most relevant topics in this field is the search for new selectors capable of providing high enantiomeric resolutions. Chiral ionic liquids (CILs) have interesting characteristics conferring them a high potential in chiral separations although only some of them are commercially available. The aim of this article is to review all the works published on the use of CILs as chiral selectors in the development of enantioselective methodologies by CE, covering the period from 2006 (when the first research work on this topic was published) to 2017. The use of CILs as sole chiral selectors, as chiral selectors in dual systems or as chiral ligands will be considered. This review also provides detailed analytical information on the experimental conditions used to carry out enantioseparations in different fields as well as on the separation mechanism involved.
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Affiliation(s)
- Maider Greño
- a Departamento de Química Analítica , Química Física e Ingeniería Química, Universidad de Alcalá , Alcalá de Henares, Madrid , Spain
| | - María Luisa Marina
- a Departamento de Química Analítica , Química Física e Ingeniería Química, Universidad de Alcalá , Alcalá de Henares, Madrid , Spain.,b Instituto de Investigación Química Andrés M. del Río, Universidad de Alcalá , Alcalá de Henares, Madrid , Spain
| | - María Castro-Puyana
- a Departamento de Química Analítica , Química Física e Ingeniería Química, Universidad de Alcalá , Alcalá de Henares, Madrid , Spain.,b Instituto de Investigación Química Andrés M. del Río, Universidad de Alcalá , Alcalá de Henares, Madrid , Spain
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29
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Capillary electrophoresis separation of phenethylamine enantiomers using amino acid based ionic liquids. J Pharm Biomed Anal 2017; 148:245-250. [PMID: 29059613 DOI: 10.1016/j.jpba.2017.10.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 10/10/2017] [Accepted: 10/12/2017] [Indexed: 01/08/2023]
Abstract
In recent years increasing interest was drawn towards ionic liquids in analytical separation science, such as capillary electrophoresis. Ionic liquids combining tetrabutylammonium cations with chiral amino acid based anions were prepared and investigated as capillary electrophoresis background electrolyte additives for the enantioseparation of ephedrine, pseudoephedrine, and methylephedrine isomers. For the optimization of buffer pH and ionic liquid concentration a design of experiments approach was performed. The best results for the separation of all enantiomers were achieved using 125mmol/L tetrabutylammonium l-argininate in a 75mmol/L phosphate buffer pH 1.5 containing 30mmol/L β-cyclodextrin.
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30
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Chen J, Du Y, Sun X. Investigation of maltodextrin-based synergistic system with amino acid chiral ionic liquid as additive for enantioseparation in capillary electrophoresis. Chirality 2017; 29:824-835. [PMID: 28971527 DOI: 10.1002/chir.22751] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 07/26/2017] [Accepted: 07/30/2017] [Indexed: 12/25/2022]
Abstract
The combined use of chiral ionic liquids (ILs) and chiral selectors in capillary electrophoresis (CE) to establish a synergistic system has proven to be an effective approach for enantioseparation. In this article, tetramethylammonium-L-arginine, a kind of amino acid chiral IL, was applied to investigate its potential synergistic effect with maltodextrin in CE enantioseparation. The established maltodextrin-based synergistic system showed markedly improved enantioseparations compared with the single maltodextrin system. Parameters such as the chiral IL concentration, maltodextrin concentration, buffer pH, applied voltage, and capillary temperature were optimized. Satisfactory enantioseparation of the five studied drugs, including nefopam, duloxetine, ketoconazole, cetirizine, and citalopram was achieved in 50 mM Tris-H3 PO4 buffer solution (pH 3.0) containing 7.0% (m/v) maltodextrin and 60 mM tetramethylammonium-L-arginine. In addition, the chiral configuration of tetramethylammonium-L-arginine was also investigated to demonstrate the existence of a synergistic effect between chiral ILs and maltodextrin.
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Affiliation(s)
- Jiaquan Chen
- Department of Analytical Chemistry, China Pharmaceutical University, Nanjing, China
| | - Yingxiang Du
- Department of Analytical Chemistry, China Pharmaceutical University, Nanjing, China.,Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education), China Pharmaceutical University, Nanjing, China.,State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China
| | - Xiaodong Sun
- Department of Analytical Chemistry, China Pharmaceutical University, Nanjing, China
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31
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Stavrou IJ, Agathokleous EA, Kapnissi-Christodoulou CP. Chiral selectors in CE: Recent development and applications (mid-2014 to mid-2016). Electrophoresis 2017; 38:786-819. [DOI: 10.1002/elps.201600322] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 11/22/2016] [Accepted: 11/23/2016] [Indexed: 11/05/2022]
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32
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Zhang Q, Qi X, Feng C, Tong S, Rui M. Three chiral ionic liquids as additives for enantioseparation in capillary electrophoresis and their comparison with conventional modifiers. J Chromatogr A 2016; 1462:146-52. [DOI: 10.1016/j.chroma.2016.07.066] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 07/18/2016] [Accepted: 07/25/2016] [Indexed: 11/28/2022]
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33
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Evaluation of synergistic enantioseparation systems with chiral spirocyclic ionic liquids as additives by capillary electrophoresis. Anal Bioanal Chem 2016; 408:2543-55. [DOI: 10.1007/s00216-016-9356-8] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 01/16/2016] [Accepted: 01/22/2016] [Indexed: 10/22/2022]
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34
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Kartsova LA, Bessonova EA, Kolobova EA. Ionic Liquids as Modifiers of Chromatographic and Electrophoretic Systems. JOURNAL OF ANALYTICAL CHEMISTRY 2016. [DOI: 10.1134/s1061934816020064] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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35
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Elfassy E, Basel Y, Mastai Y. Crystallization of amino acids at the chiral ionic liquid/water interface. CrystEngComm 2016. [DOI: 10.1039/c6ce01726f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Recently, a great interest was drawn toward ionic liquids (ILs) in analytical separation techniques. ILs possess many properties making them excellent additives in capillary electrophoresis (CE) background electrolytes (BGE). The most important property is the charge of the dissolved ions in BGE enabling the cations to interact with deprotonated silanol groups on the capillary surface and thereby modifying the electroosmotic flow (EOF). Ionic and/or proton donor-acceptor interactions between analyte and IL are possible interactions facilitating new kinds of separation mechanisms in CE. Further advantages of ILs are the high conductivity, the environmentally friendliness, and the good solubility for organic and inorganic compounds. The most commonly used ILs in capillary electrophoresis are dialkylimidazolium-based ILs, whereas for enantioseparation a lot of innovative chiral cations and anions were investigated.ILs are reported to be additives to a normal CE background electrolyte or the sole electrolyte in CE, nonaqueous CE (NACE), micellar electrokinetic chromatography (MEKC), and in enantioseparation. An overview of applications and separation mechanisms reported in the literature is given here, in addition to the enantioseparation of pseudoephedrine using tetrabutylammonium chloride (TBAC) as IL additive to an ammonium formate buffer containing β-cyclodextrin (β-CD).
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Affiliation(s)
- Ulrike Holzgrabe
- Institut für Pharmazie und Lebensmittelchemie, Universität Würzburg, Am Hubland, Würzburg, 97074, Germany.
| | - Joachim Wahl
- Institut für Pharmazie und Lebensmittelchemie, Universität Würzburg, Am Hubland, Würzburg, 97074, Germany
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37
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Stavrou IJ, Breitbach ZS, Kapnissi-Christodoulou CP. Combined use of cyclofructans and an amino acid ester-based ionic liquid for the enantioseparation of huperzine A and coumarin derivatives in CE. Electrophoresis 2015; 36:3061-8. [DOI: 10.1002/elps.201500367] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 08/27/2015] [Accepted: 08/28/2015] [Indexed: 01/03/2023]
Affiliation(s)
| | - Zachary S. Breitbach
- Department of Chemistry and Biochemistry; University of Texas at Arlington; Arlington USA
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38
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Mavroudi MC, Kapnissi-Christodoulou CP. Combined use ofl-alanine tert butyl ester lactate and trimethyl-β-cyclodextrin for the enantiomeric separations of 2-arylpropionic acids nonsteroidal anti-inflammatory drugs. Electrophoresis 2015; 36:2442-50. [DOI: 10.1002/elps.201500143] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 05/21/2015] [Accepted: 05/21/2015] [Indexed: 11/07/2022]
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39
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Zhang Q, Du Y, Du S, Zhang J, Feng Z, Zhang Y, Li X. Tetramethylammonium-lactobionate: A novel ionic liquid chiral selector based on saccharides in capillary electrophoresis. Electrophoresis 2015; 36:1216-23. [DOI: 10.1002/elps.201400358] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 02/09/2015] [Accepted: 02/24/2015] [Indexed: 01/15/2023]
Affiliation(s)
- Qi Zhang
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
| | - Yingxiang Du
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education); China Pharmaceutical University; Nanjing P. R. China
- State Key Laboratory of Natural Medicines; China Pharmaceutical University; Nanjing P. R. China
| | - Shuaijing Du
- College of Chemistry and Molecular Engineering; Peking University; Beijing P. R. China
| | - Jinjing Zhang
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
| | - Zijie Feng
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
| | - Yanjie Zhang
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
| | - Xiaoqi Li
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
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40
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Su Y, Mu X, Qi L. Development of a capillary electrophoresis system with Mn(ii) complexes and β-cyclodextrin as the dual chiral selectors for enantioseparation of dansyl amino acids and its application in screening enzyme inhibitors. RSC Adv 2015. [DOI: 10.1039/c5ra02744f] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel CLE-CE system with Mn(ii)–[BMIm][l-Ala] complexes and β-CD as the dual chiral selectors based on the synergistic effect was successfully constructed for enantioseparation of Dns-d,l-AAs and applied in screening the tyrosinase inhibitors.
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Affiliation(s)
- Yuan Su
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Analytical Chemistry for Living Biosystems
- Institute of Chemistry
- Chinese Academy of Sciences
- 100190 Beijing
| | - Xiaoyu Mu
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Analytical Chemistry for Living Biosystems
- Institute of Chemistry
- Chinese Academy of Sciences
- 100190 Beijing
| | - Li Qi
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Analytical Chemistry for Living Biosystems
- Institute of Chemistry
- Chinese Academy of Sciences
- 100190 Beijing
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41
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Chiral selectors in CE: Recent developments and applications (2012-mid 2014). Electrophoresis 2014; 36:101-23. [DOI: 10.1002/elps.201400310] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 09/25/2014] [Accepted: 09/26/2014] [Indexed: 12/19/2022]
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42
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Zhang Y, Yu H, Wu Y, Zhao W, Yang M, Jing H, Chen A. Combined use of [TBA][L-ASP] and hydroxypropyl-β-cyclodextrin as selectors for separation of Cinchona alkaloids by capillary electrophoresis. Anal Biochem 2014; 462:13-8. [DOI: 10.1016/j.ab.2014.06.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Revised: 06/10/2014] [Accepted: 06/11/2014] [Indexed: 01/07/2023]
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43
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Kapnissi-Christodoulou CP, Stavrou IJ, Mavroudi MC. Chiral ionic liquids in chromatographic and electrophoretic separations. J Chromatogr A 2014; 1363:2-10. [DOI: 10.1016/j.chroma.2014.05.059] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Revised: 05/17/2014] [Accepted: 05/20/2014] [Indexed: 02/07/2023]
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44
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Mavroudi MC, Kapnissi-Christodoulou CP. Evaluation of amino acid ester-based ionic liquids as buffer additives in CE for the separation of 2-arylpropionic acids nonsteroidal anti-inflammatory drugs. Electrophoresis 2014; 35:2573-8. [DOI: 10.1002/elps.201400165] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Revised: 05/16/2014] [Accepted: 05/16/2014] [Indexed: 11/10/2022]
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45
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Zhang Q, Du Y, Du S. Evaluation of ionic liquids-coated carbon nanotubes modified chiral separation system with chondroitin sulfate E as chiral selector in capillary electrophoresis. J Chromatogr A 2014; 1339:185-91. [DOI: 10.1016/j.chroma.2014.02.003] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 02/01/2014] [Accepted: 02/03/2014] [Indexed: 11/16/2022]
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