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Gärtner A, de Almeida Santos G, Ruff AJ, Schwaneberg U. A Screening Method for P450 BM3 Mutant Libraries Using Multiplexed Capillary Electrophoresis for Detection of Enzymatically Converted Compounds. Methods Mol Biol 2022; 2461:195-210. [PMID: 35727452 DOI: 10.1007/978-1-0716-2152-3_13] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Capillary electrophoresis (CE) is an analytical method in which charged species are separated by attraction or repulsion performed in submillimeter diameter capillaries or micro- and nanofluidic channels through the application of a high voltage electric field. When capillary electrophoresis is assembled in a multicapillary instrument such as 96-well format (multiplexed), it becomes a powerful high-throughput system with the ability to simultaneously screen several types of samples like genetic mutations, metabolomes, kinase inhibitors, or enzymatic activities to name a few. The usage of a 96-multiplexed capillary electrophoresis system (96-MP-CE) represents a new platform for product-specific high-throughput screening of enzyme mutant libraries from directed evolution campaigns providing a comprehensive view on enzyme activity through the detection of all products formed. We describe the application of 96-MP-CE to screen mutant libraries of P450 BM3. MP-CE was used in directed evolution campaigns toward benzo-1,4-dioxane and α-isophorone.
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Affiliation(s)
- Anna Gärtner
- Institute of Biotechnology, RWTH Aachen University, Aachen, Germany
| | | | - Anna Joëlle Ruff
- Institute of Biotechnology, RWTH Aachen University, Aachen, Germany
| | - Ulrich Schwaneberg
- Institute of Biotechnology, RWTH Aachen University, Aachen, Germany.
- DWI-Leibniz Institut für Interaktive Materialien, Aachen, Germany.
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Non-aqueous electrophoresis integrated with electrospray ionization mass spectrometry on a thiol-ene polymer-based microchip device. Anal Bioanal Chem 2021; 413:4195-4205. [PMID: 33954829 DOI: 10.1007/s00216-021-03374-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/20/2021] [Accepted: 04/23/2021] [Indexed: 10/21/2022]
Abstract
Non-aqueous capillary electrophoresis (NACE) on microfluidic chips is still a comparatively little explored area, despite the inherent advantages of this technique and its application potential for, in particular, lipophilic compounds. A main reason is probably the fact that implementation of NACE on microchips largely precluded the use of polymeric substrate materials. Here, we report non-aqueous electrophoresis on a thiol-ene-based microfluidic chip coupled to mass spectrometry via an on-chip ESI interface. Microchips with an integrated ESI emitter were fabricated using a double-molding approach. The durability of thiol-ene, when exposed to different organic solvents, was investigated with respect to swelling and decomposition of the polymer. Thiol-ene exhibited good stability against organic solvents such as methanol, ethanol, N-methylformamide, and formamide, which allows for a wide range of background electrolyte compositions. The integrated ESI emitter provided a stable spray with RSD% of the ESI signal ≤8%. Separation efficiency of the developed microchip electrophoresis system in different non-aqueous buffer solutions was tested with a mixture of several drugs of abuse. Ethanol- and methanol-based buffers provided comparable high theoretical plate numbers (≈ 6.6 × 104-1.6 × 105 m-1) with ethanol exhibiting the best separation efficiency. Direct coupling of non-aqueous electrophoresis to mass spectrometry allowed for fast analysis of hydrophobic compounds in the range of 0.1-5 μg mL-1 and 0.2-10 μg mL-1 and very good sensitivities (LOD ≈ 0.06-0.28 μg mL-1; LOQ ≈ 0.20-0.90 μg mL-1). The novel combination of non-aqueous CE on a microfluidic thiol-ene device and ESI-MS provides a mass-producible and highly versatile system for the analysis of, in particular, lipophilic compounds in a wide range of organic solvents. This offers promising potential for future applications in forensic, clinical, and environmental analysis. Graphical abstract.
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Morani M, Taverna M, Mai TD. A fresh look into background electrolyte selection for capillary electrophoresis‐laser induced fluorescence of peptides and proteins. Electrophoresis 2019; 40:2618-2624. [DOI: 10.1002/elps.201900084] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 05/14/2019] [Accepted: 05/18/2019] [Indexed: 12/29/2022]
Affiliation(s)
- Marco Morani
- Institut Galien Paris Sud, UMR 8612, Protein and Nanotechnology in Analytical Science (PNAS)CNRSUniv. Paris‐SudUniv. Paris‐Saclay Châtenay‐Malabry France
| | - Myriam Taverna
- Institut Galien Paris Sud, UMR 8612, Protein and Nanotechnology in Analytical Science (PNAS)CNRSUniv. Paris‐SudUniv. Paris‐Saclay Châtenay‐Malabry France
| | - Thanh Duc Mai
- Institut Galien Paris Sud, UMR 8612, Protein and Nanotechnology in Analytical Science (PNAS)CNRSUniv. Paris‐SudUniv. Paris‐Saclay Châtenay‐Malabry France
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Letrozole Determination by Capillary Zone Electrophoresis and UV Spectrophotometry Methods. ACTA MEDICA MARISIENSIS 2017. [DOI: 10.1515/amma-2017-0022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Objective: Letrozole is a highly potent oral nonsteroidal aromatase inhibitor triazole derivative. The aim of this study was to quantify letrozole from bulk, pharmaceutical formulation, and spiked urine samples by developing a simple, rapid and cost effective capillary electrophoresis method. Methods: A capillary zone electrophoresis method was optimized and validated. Additionally, an UV spectrophotometry method was used for comparing results. Results:The capillary zone electrophoresis method using a 90 mM sodium tetraborate background electrolyte proved to be an efficient method for determination of letrozole in a very short time, less than 2 minutes, using 20 kV voltage, 50 mbar/2 seconds pressure and 50°C temperature as optimum parameters. Additionally, the UV spectrophotometry method proved to be simple and efficient to quantify letrozole from bulk material and pharmaceutical formulation with linearity of response between 5 to 20 μg·mL-1 concentrations. For both methods, validation parameters, including linearity, detection and quantification limits were determined. Also we proved that our electrophoretic method has potential in analyzing letrozole from biological samples, obtaining encouraging results on estimation of letrozole from spiked urine samples without any special treatment. Conclusions: To quantify letrozole from bulk material, pharmaceutical preparations, and spiked urine samples the capillary zone electrophoresis method using a tetraborate sodium background electrolyte has proven to be simple and appropriate. Also a simple UV spectrophotometric method has been developed and validated for the same purposes.
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Porfírio S, Gomes da Silva MD, Peixe A, Cabrita MJ, Azadi P. Current analytical methods for plant auxin quantification – A review. Anal Chim Acta 2016; 902:8-21. [DOI: 10.1016/j.aca.2015.10.035] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Revised: 10/26/2015] [Accepted: 10/27/2015] [Indexed: 02/06/2023]
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Pallandre A, Korchane S, Le Potier I, Gamby J, Lassus B, Méance S, Chebil S, Plecis A, Xiong B, Ringard-Lefebvre C, Rosilio V, Taverna M, Haghiri-Gosnet AM. Study of Surface Charge Instabilities by EOF Measurements on a Chip: A Real-Time Hysteresis and Peptide Adsorption Based Methodology. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:10318-10325. [PMID: 26317498 DOI: 10.1021/acs.langmuir.5b02413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This paper describes the measurement of the electroosmotic mobility (EOF) in a Wheatstone fluidic bridge (μFWB) as a direct probe of the surface instability. The variation of EOF known as one major contribution of the electrokinetic migration has been determined with a real-time measurement platform after different conditionings on chips. We also scan the pH of the background electrolytes with three different ionic strengths to evaluate the dependencies of the EOF as a function of the pH. A hysteresis methodology has been developed for probing the surface charge instabilities. EOF mobility has been recorded during on-a-chip electrophoresis to estimate the effect of such instability on the analytical performance. As expected, our experimental curves show that a decrease in the ionic strength increases the surface charge stability of the hybrid microchip. This result demonstrates that ionic exchanges between the surface and the fluid are clearly involved in the stability of the surface charge. With this original method based on real-time EOF measurement, the surface state can be characterized after hydrodynamic and electrophoresis sequences to mimic any liquid conditioning and separation steps. Finally, as a demonstrative application, isotherms of the adsorption of insulin have been recorded showing the change in surface charge by unspecific adsorption of this biomolecule onto the microfluidic channel's wall. These methodologies and findings could be particularly relevant to investigating various analytical pathways and to understanding the molecular mechanisms at solid/liquid interfaces.
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Affiliation(s)
- Antoine Pallandre
- Laboratoire de Photonique et Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France
- Univ Parie Sud, Faculté de Pharmacie, 5 rue Jean-Baptiste Clément, 92290 Châtenay-Malabry, France
| | - Sonia Korchane
- Univ Parie Sud, Faculté de Pharmacie, 5 rue Jean-Baptiste Clément, 92290 Châtenay-Malabry, France
- Institut Galien Paris-Sud, CNRS UMR 8612, 5 rue Jean-Baptiste Clément, 92290 Châtenay-Malabry, France
| | - Isabelle Le Potier
- Univ Parie Sud, Faculté de Pharmacie, 5 rue Jean-Baptiste Clément, 92290 Châtenay-Malabry, France
- Institut Galien Paris-Sud, CNRS UMR 8612, 5 rue Jean-Baptiste Clément, 92290 Châtenay-Malabry, France
| | - Jean Gamby
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, 4 place Jussieu, F-75005 Paris, France
| | - Benjamin Lassus
- Laboratoire de Photonique et Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France
| | - Sebastien Méance
- Laboratoire de Photonique et Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France
| | - Syrine Chebil
- Laboratoire de Photonique et Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France
| | - Adrien Plecis
- Elvesys, Pépinière Paris Santé Cochin, 29 rue du Faubourg Saint Jacques, 75014 Paris, France
| | - Bo Xiong
- Institut Galien Paris-Sud, CNRS UMR 8612, 5 rue Jean-Baptiste Clément, 92290 Châtenay-Malabry, France
| | - Catherine Ringard-Lefebvre
- Univ Parie Sud, Faculté de Pharmacie, 5 rue Jean-Baptiste Clément, 92290 Châtenay-Malabry, France
- Institut Galien Paris-Sud, CNRS UMR 8612, 5 rue Jean-Baptiste Clément, 92290 Châtenay-Malabry, France
| | - Véronique Rosilio
- Univ Parie Sud, Faculté de Pharmacie, 5 rue Jean-Baptiste Clément, 92290 Châtenay-Malabry, France
- Institut Galien Paris-Sud, CNRS UMR 8612, 5 rue Jean-Baptiste Clément, 92290 Châtenay-Malabry, France
| | - Myriam Taverna
- Univ Parie Sud, Faculté de Pharmacie, 5 rue Jean-Baptiste Clément, 92290 Châtenay-Malabry, France
- Institut Galien Paris-Sud, CNRS UMR 8612, 5 rue Jean-Baptiste Clément, 92290 Châtenay-Malabry, France
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Al-Ghobashy MA. Electrophoretic behavior of charge regulated zwitter ionic buffers in covalently and dynamically coated fused silica capillaries. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.bfopcu.2014.03.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Stalmach A, Albalat A, Mullen W, Mischak H. Recent advances in capillary electrophoresis coupled to mass spectrometry for clinical proteomic applications. Electrophoresis 2013; 34:1452-64. [DOI: 10.1002/elps.201200708] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Revised: 02/07/2013] [Accepted: 02/14/2013] [Indexed: 12/14/2022]
Affiliation(s)
- Angelique Stalmach
- Department of Proteomics and Systems Medicine; BHF Glasgow Cardiovascular Research Centre; Institute of Cardiovascular and Medical Sciences; College of Medical Veterinary and Life Sciences; University of Glasgow; Glasgow; UK
| | - Amaya Albalat
- Department of Proteomics and Systems Medicine; BHF Glasgow Cardiovascular Research Centre; Institute of Cardiovascular and Medical Sciences; College of Medical Veterinary and Life Sciences; University of Glasgow; Glasgow; UK
| | - William Mullen
- Department of Proteomics and Systems Medicine; BHF Glasgow Cardiovascular Research Centre; Institute of Cardiovascular and Medical Sciences; College of Medical Veterinary and Life Sciences; University of Glasgow; Glasgow; UK
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Xu J, Zhang L, Chen G. Fabrication of a magnet-assisted alignment device for the amperometric detection of capillary electrophoresis using a carbon nanotube/polypropylene composite electrode. Electrophoresis 2013; 34:2017-24. [DOI: 10.1002/elps.201200443] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Revised: 09/03/2012] [Accepted: 09/04/2012] [Indexed: 01/06/2023]
Affiliation(s)
- Junchao Xu
- School of Pharmacy; Fudan University; Shanghai; China
| | - Luyan Zhang
- School of Pharmacy; Fudan University; Shanghai; China
| | - Gang Chen
- School of Pharmacy; Fudan University; Shanghai; China
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A study on the system of nonaqueous microchip electrophoresis with on-line peroxyoxalate chemiluminescence detection. J Sep Sci 2013; 36:713-20. [DOI: 10.1002/jssc.201200832] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2012] [Revised: 10/24/2012] [Accepted: 10/24/2012] [Indexed: 01/16/2023]
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11
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Mojarad N, Krishnan M. Measuring the size and charge of single nanoscale objects in solution using an electrostatic fluidic trap. NATURE NANOTECHNOLOGY 2012; 7:448-452. [PMID: 22728340 DOI: 10.1038/nnano.2012.99] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Accepted: 05/11/2012] [Indexed: 06/01/2023]
Abstract
Measuring the size and charge of objects suspended in solution, such as dispersions of colloids or macromolecules, is a significant challenge. Measurements based on light scattering are inherently biased to larger entities, such as aggregates in the sample, because the intensity of light scattered by a small object scales as the sixth power of its size. Techniques that rely on the collective migration of species in response to external fields (electric or hydrodynamic, for example) are beset with difficulties including low accuracy and dispersion-limited resolution. Here, we show that the size and charge of single nanoscale objects can be directly measured with high throughput by analysing their thermal motion in an array of electrostatic traps. The approach, which is analogous to Millikan's oil drop experiment, could in future be used to detect molecular binding events with high sensitivity or carry out dynamic single-charge resolved measurements at the solid/liquid interface.
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Affiliation(s)
- Nassiredin Mojarad
- Laboratory for Physical Chemistry, ETH Zurich, Wolfgang-Pauli Strasse 10, Zurich, Switzerland
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12
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Miserere S, Mottet G, Taniga V, Descroix S, Viovy JL, Malaquin L. Fabrication of thermoplastics chips through lamination based techniques. LAB ON A CHIP 2012; 12:1849-56. [PMID: 22487893 DOI: 10.1039/c2lc21161k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In this work, we propose a novel strategy for the fabrication of flexible thermoplastic microdevices entirely based on lamination processes. The same low-cost laminator apparatus can be used from master fabrication to microchannel sealing. This process is appropriate for rapid prototyping at laboratory scale, but it can also be easily upscaled to industrial manufacturing. For demonstration, we used here Cycloolefin Copolymer (COC), a thermoplastic polymer that is extensively used for microfluidic applications. COC is a thermoplastic polymer with good chemical resistance to common chemicals used in microfluidics such as acids, bases and most polar solvents. Its optical quality and mechanical resistance make this material suitable for a large range of applications in chemistry or biology. As an example, the electrokinetic separation of pollutants is proposed in the present study.
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13
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Separation of long DNA fragments by inversion field capillary electrophoresis. Anal Bioanal Chem 2011; 401:1661-7. [PMID: 21766216 DOI: 10.1007/s00216-011-5228-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 05/23/2011] [Accepted: 06/30/2011] [Indexed: 10/18/2022]
Abstract
This study reports improved pulsed field capillary electrophoresis (PFCE) for separation of large DNA ladders. Important analytical conditions, including gel polymer concentration, ratio of forward to backward pulse duration, and separation potential, were investigated for their effects on the separation performance of DNA ranging in size from 0.1 to 10.0 kilo base pairs (kbp). Results show that DNA fragments from 0.1 to 8.0 kbp can be resolved with high resolution, simultaneously, in a short time. The ratio of forward to backward pulse duration affects the separation performance for DNA fragments greater than 1.5 kbp, and 3 or 4 is the optimum value of the ratio for separation of DNA up to 10 kbp. Furthermore, the separations that were obtained with 74-19,329 bp λ-DNA restriction fragments clearly demonstrate a dramatic improvement in the separation time and resolution over the conventionally used square-wave PFCE. The inversion field capillary electrophoresis reported here may help enable future DNA analysis studies to be performed quickly and effectively.
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Baños CE, Silva M. A novel clean-up method for urine analysis of low-molecular mass aldehydes by capillary electrophoresis with laser-induced fluorescence detection. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:1412-8. [DOI: 10.1016/j.jchromb.2010.10.033] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2010] [Revised: 09/22/2010] [Accepted: 10/30/2010] [Indexed: 01/11/2023]
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Al-Ghobashy MA, Williams MAK, Laible G, Harding DRK. CZE with On-line Micellar Sample Stacking for Determination of Protein Concentration of Biopharmaceuticals. Chromatographia 2011. [DOI: 10.1007/s10337-011-2003-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Sladkov V, Zhao Y, Mercier-Bion F. Capillary zone electrophoresis for U(VI) and short chain carboxylic acid sorption studies on silica and rutile. Talanta 2011; 83:1595-600. [DOI: 10.1016/j.talanta.2010.11.055] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2010] [Revised: 11/15/2010] [Accepted: 11/22/2010] [Indexed: 10/18/2022]
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de la Guardia M, Armenta S. Multianalyte Determination Versus One-at-a-Time Methodologies. GREEN ANALYTICAL CHEMISTRY 2011. [DOI: 10.1016/b978-0-444-53709-6.00006-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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INOUE D, MITSUSHIMA S, MATSUZAWA K, LEE SY, YASUDA T, WATANABE M, OTA KI. A Mesothermal Fuel Cell using Diethylmethylammonium Trifluoromethanesulfonate Absorbed Membrane with H3PO4 Addition and Various Amount of Electrolyte Loading in Catalyst Layer. ELECTROCHEMISTRY 2011. [DOI: 10.5796/electrochemistry.79.377] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Mass transportation in diethylmethylammonium trifluoromethanesulfonate for fuel cell applications. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.06.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Li Z, Dou X, Ni Y, Sumitomo K, Yamaguchi Y. The influence of polymer concentration, applied voltage, modulation depth and pulse frequency on DNA separation by pulsed field CE. J Sep Sci 2010; 33:2811-7. [DOI: 10.1002/jssc.201000188] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Felhofer JL, Blanes L, Garcia CD. Recent developments in instrumentation for capillary electrophoresis and microchip-capillary electrophoresis. Electrophoresis 2010; 31:2469-86. [PMID: 20665910 PMCID: PMC2928674 DOI: 10.1002/elps.201000203] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Over the last years, there has been an explosion in the number of developments and applications of CE and microchip-CE. In part, this growth has been the direct consequence of recent developments in instrumentation associated with CE. This review, which is focused on the contributions published in the last 5 years, is intended to complement the articles presented in this special issue dedicated to instrumentation and to provide an overview of the general trends and some of the most remarkable developments published in the areas of high-voltage power supplies, detectors, auxiliary components, and compact systems. It also includes a few examples of alternative uses of and modifications to traditional CE instruments.
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Affiliation(s)
- Jessica L. Felhofer
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States of America
| | - Lucas Blanes
- Centre for Forensic Science, University of Technology, Sydney, PO Box 123, Broadway, NSW 2007, Australia
| | - Carlos D. Garcia
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States of America
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Cheng J, Zhang L, Lu Q, Lu M, Chen Z, Chen G. pCEC coupling with ESI-MS for the analysis of β2-agonists and narcotics using a poly-(1-hexadecene-co-TMPTMA) monolithic column. Electrophoresis 2010; 31:1991-7. [DOI: 10.1002/elps.201000088] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Li L, Zhou S, Jin L, Zhang C, Liu W. Enantiomeric separation of organophosphorus pesticides by high-performance liquid chromatography, gas chromatography and capillary electrophoresis and their applications to environmental fate and toxicity assays. J Chromatogr B Analyt Technol Biomed Life Sci 2010; 878:1264-76. [DOI: 10.1016/j.jchromb.2009.10.031] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2009] [Revised: 10/26/2009] [Accepted: 10/29/2009] [Indexed: 11/15/2022]
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Dawod M, Breadmore MC, Guijt RM, Haddad PR. Electrokinetic supercharging-electrospray ionisation-mass spectrometry for separation and on-line preconcentration of hypolipidaemic drugs in water samples. Electrophoresis 2010; 31:1184-1193. [DOI: 10.1002/elps.200900420] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Determination of potassium, sodium, calcium and magnesium in total parenteral nutrition formulations by capillary electrophoresis with contactless conductivity detection. J Pharm Biomed Anal 2010; 53:130-6. [PMID: 20172679 DOI: 10.1016/j.jpba.2010.01.042] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2009] [Revised: 01/25/2010] [Accepted: 01/26/2010] [Indexed: 11/22/2022]
Abstract
A simple method based on capillary electrophoresis with a capacitively coupled contactless conductivity detector (CE-C(4)D) was developed for the determination of potassium, sodium, calcium and magnesium in parenteral nutrition formulations. A hydro-organic mixture, consisting of 100 mM Tris-acetate buffer at pH 4.5 and acetonitrile (80:20, v/v), was selected as the background electrolyte. The applied voltage was 30 kV, and sample injection was performed in hydrodynamic mode. All analyses were carried out in a fused silica capillary with an internal diameter of 50 microm and a total length of 64.5 cm. Under these conditions, complete separation between all cations was achieved in less than 4 min. The CE-C(4)D method was validated, and trueness values between 98.6% and 101.8% were obtained with repeatability and intermediate precision values of 0.4-1.3% and 0.8-1.8%, respectively. Therefore, this method was found to be appropriate for controlling potassium, sodium, calcium and magnesium in parenteral nutrition formulations and successfully applied in daily quality control at the Geneva University Hospitals.
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Valls J, Millán S, Martí MP, Borràs E, Arola L. Advanced separation methods of food anthocyanins, isoflavones and flavanols. J Chromatogr A 2009; 1216:7143-72. [PMID: 19691963 DOI: 10.1016/j.chroma.2009.07.030] [Citation(s) in RCA: 182] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2009] [Revised: 06/15/2009] [Accepted: 07/02/2009] [Indexed: 01/13/2023]
Abstract
In recent years, increasing knowledge of the positive health effects of food polyphenols has prompted the need to develop new separation techniques for their extraction, fractionation and analysis. This article provides an updated and exhaustive review of the application of counter-current chromatography, high performance liquid chromatography, capillary electrophoresis, and their hyphenation with mass spectrometry to the study of food polyphenols. Flavonoids constitute the largest class of polyphenols, widely spread in the plant kingdom and common in human diet which has been the most widely studied with respect to their antioxidant and biological activities. The main subgroups are anthocyanins, catechins, isoflavones, flavonols and flavones. They are reported to exhibit antioxidant, anti-carcinogenic, anti-inflammatory, anti-atherogenic, anti-thrombotic, and immune modulating functions, among others. Since red fruit anthocyanins, soy isoflavones and flavanols from grapes and teas are currently the most used phenolic compounds for producing new nutraceuticals and functional foods, this review is focused on these three flavonoid groups.
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Li MD, Tseng WL, Cheng TL. Ultrasensitive detection of indoleamines by combination of nanoparticle-based extraction with capillary electrophoresis/laser-induced native fluorescence. J Chromatogr A 2009; 1216:6451-8. [DOI: 10.1016/j.chroma.2009.07.034] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Revised: 07/11/2009] [Accepted: 07/17/2009] [Indexed: 11/15/2022]
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29
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Ionic liquids used in and analyzed by capillary and microchip electrophoresis. J Chromatogr A 2009; 1216:4817-23. [DOI: 10.1016/j.chroma.2009.04.024] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2009] [Revised: 04/03/2009] [Accepted: 04/08/2009] [Indexed: 11/18/2022]
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