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Kochetkov KA, Bystrova NA, Pavlov PA, Oshchepkov MS, Oshchepkov AS. Microfluidic Asymmetrical Synthesis and Chiral Analysis. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.08.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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2
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Thurmann S, Lotter C, Heiland JJ, Chankvetadze B, Belder D. Chip-Based High-Performance Liquid Chromatography for High-Speed Enantioseparations. Anal Chem 2015; 87:5568-76. [DOI: 10.1021/acs.analchem.5b00210] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Sebastian Thurmann
- Institute
of Analytical Chemistry, University of Leipzig, Linnéstraße 3, 04103 Leipzig, Germany
| | - Carsten Lotter
- Institute
of Analytical Chemistry, University of Leipzig, Linnéstraße 3, 04103 Leipzig, Germany
| | - Josef J. Heiland
- Institute
of Analytical Chemistry, University of Leipzig, Linnéstraße 3, 04103 Leipzig, Germany
| | - Bezhan Chankvetadze
- Department
of Physical and Analytical Chemistry, School of Exact and Natural
Sciences, Tbilisi State University, 0179 Tbilisi, Republic of Georgia
| | - Detlev Belder
- Institute
of Analytical Chemistry, University of Leipzig, Linnéstraße 3, 04103 Leipzig, Germany
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3
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Ali I, Al-Othman ZA, Al-Warthan A, Asnin L, Chudinov A. Advances in chiral separations of small peptides by capillary electrophoresis and chromatography. J Sep Sci 2014; 37:2447-66. [DOI: 10.1002/jssc.201400587] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 06/26/2014] [Accepted: 06/27/2014] [Indexed: 01/27/2023]
Affiliation(s)
- Imran Ali
- Department of Chemistry, Jamia Millia Islamia (Central University); New Delhi India
| | - Zeid A. Al-Othman
- Department of Chemistry, College of Science; King Saud University; Riyadh Kingdom of Saudi Arabia
| | - Abdulrahman Al-Warthan
- Department of Chemistry, College of Science; King Saud University; Riyadh Kingdom of Saudi Arabia
| | - Leonid Asnin
- Perm National Research Polytechnic University; Perm Russia
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Bayat S, Tejo BA, Abdulmalek E, Salleh AB, Normi YM, Abdul Rahman MB. Rational design of mimetic peptides based on aldo-ketoreductase enzyme as asymmetric organocatalysts in aldol reactions. RSC Adv 2014. [DOI: 10.1039/c4ra04866k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Excellent yield (up to 97%), enantioselectivity (up to 99%) and diastereoselectivity (up to 99/1) were obtained using mimetic peptides.
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Affiliation(s)
- Saadi Bayat
- Enzyme and Microbial Technology Research Centre
- Universiti Putra Malaysia
- 43400 Serdang, Malaysia
- Department of Chemistry
- Faculty of Science
| | - Bimo A. Tejo
- Center for Infectious Diseases Research Surya University
- Jl. Scientia
- Tangerang 15810, Indonesia
| | - Emilia Abdulmalek
- Enzyme and Microbial Technology Research Centre
- Universiti Putra Malaysia
- 43400 Serdang, Malaysia
- Department of Chemistry
- Faculty of Science
| | - Abu Bakar Salleh
- Enzyme and Microbial Technology Research Centre
- Universiti Putra Malaysia
- 43400 Serdang, Malaysia
| | - Yahaya M. Normi
- Enzyme and Microbial Technology Research Centre
- Universiti Putra Malaysia
- 43400 Serdang, Malaysia
| | - Mohd Basyaruddin Abdul Rahman
- Enzyme and Microbial Technology Research Centre
- Universiti Putra Malaysia
- 43400 Serdang, Malaysia
- Department of Chemistry
- Faculty of Science
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5
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Dixit S, Park JH. Application of antibiotics as chiral selectors for capillary electrophoretic enantioseparation of pharmaceuticals: a review. Biomed Chromatogr 2013; 28:10-26. [PMID: 23780664 DOI: 10.1002/bmc.2950] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 05/02/2013] [Indexed: 12/27/2022]
Abstract
Recent years have witnessed several new trends in chiral separation, for example, the enantiorecognition ability of several new antibiotics has been explored using capillary electrophoresis (CE) prior to HPLC; antibiotics have been employed as chiral selectors (CSs) in a nonaqueous CE (NACE) mode; and several new detection techniques (namely, capacitively coupled contactless conductivity detection) have been used in combination with CE for quantification of enantiomers. On account of these emerging trends, this article aims to review the application of various classes of antibiotics for CE enantioseparation of pharmaceuticals. A detailed account of the basic factors affecting enantioseparation, certain limitations of antibiotics as CSs and strategies to mitigate them, and advantages of NACE while using antibiotics as CSs has also been presented.
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Affiliation(s)
- Shuchi Dixit
- Department of Chemistry, Yeungnam University, Gyeongsan, 712-749, South Korea
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6
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Wernisch S, Lindner W. Versatility of cinchona-based zwitterionic chiral stationary phases: Enantiomer and diastereomer separations of non-protected oligopeptides utilizing a multi-modal chiral recognition mechanism. J Chromatogr A 2012; 1269:297-307. [DOI: 10.1016/j.chroma.2012.06.094] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Revised: 06/25/2012] [Accepted: 06/27/2012] [Indexed: 12/13/2022]
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Abstract
AbstractCapillary electrophoresis (CE) is an attractive technique in separation science because of its high separation performance, short analysis time and low cost. Electrochemical detection (EC) is a powerful tool for CE because of its high sensitivity. In this review, developments of CE-EC from 2008 to August, 2011 are reviewed. We choose papers of innovative and novel results to demonstrate the newest and most important progress in CE-EC.
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Lima RS, Segato TP, Gobbi AL, Coltro WKT, Carrilho E. Doping of a dielectric layer as a new alternative for increasing sensitivity of the contactless conductivity detection in microchips. LAB ON A CHIP 2011; 11:4148-4151. [PMID: 22045405 DOI: 10.1039/c1lc20757a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This communication describes a new procedure to increase the sensitivity of C(4)D in PDMS/glass microchips. The method consists in doping the insulating layer (PDMS) over the electrodes with nanoparticles of TiO(2), increasing thus its dielectric constant. The experimental protocol is simple, inexpensive, and fast.
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Affiliation(s)
- Renato Sousa Lima
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, Brazil
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Mantim T, Nacapricha D, Wilairat P, Hauser PC. Enantiomeric separation of some common controlled stimulants by capillary electrophoresis with contactless conductivity detection. Electrophoresis 2011; 33:388-94. [PMID: 22170109 DOI: 10.1002/elps.201100370] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2011] [Revised: 08/11/2011] [Accepted: 08/11/2011] [Indexed: 02/01/2023]
Abstract
CE methods with capacitively coupled contactless conductivity detection (C(4)D) were developed for the enantiomeric separation of the following stimulants: amphetamine (AP), methamphetamine (MA), ephedrine (EP), pseudoephedrine (PE), norephedrine (NE) and norpseudoephedrine (NPE). Acetic acid (pH 2.5 and 2.8) was found to be the optimal background electrolyte for the CE-C(4)D system. The chiral selectors, carboxymethyl-β-cyclodextrin (CMBCD), heptakis(2,6-di-O-methyl)-β-cyclodextrin (DMBCD) and chiral crown ether (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid (18C6H(4)), were investigated for their enantioseparation properties in the BGE. The use of either a single or a combination of two chiral selectors was chosen to obtain optimal condition of enantiomeric selectivity. Enantiomeric separation of AP and MA was achieved using the single chiral selector CMBCD and (hydroxypropyl)methyl cellulose (HPMC) as the modifier. A combination of the two chiral selectors, CMBCD and DMBCD and HPMC as the modifier, was required for enantiomeric separation of EP and PE. In addition, a combination of DMBCD and 18C6H(4) was successfully applied for the enantiomeric separation of NE and NPE. The detection limits of the enantiomers were found to be in the range of 2.3-5.7 μmol/L. Good precisions of migration time and peak area were obtained. The developed CE-C(4)D method was successfully applied to urine samples of athletes for the identification of enantiomers of the detected stimulants.
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Affiliation(s)
- Thitirat Mantim
- Flow Innovation-Research for Science and Technology Laboratories (First Labs), Mahidol University, Bangkok, Thailand
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10
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Electrophoretic separation of acidic and basic proteins in the presence of micromolar concentrations of an ionic liquid. Mikrochim Acta 2011. [DOI: 10.1007/s00604-011-0599-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Pormsila W, Morand R, Krähenbühl S, Hauser PC. Capillary electrophoresis with contactless conductivity detection for the determination of carnitine and acylcarnitines in clinical samples. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:921-6. [DOI: 10.1016/j.jchromb.2011.02.046] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Revised: 12/21/2010] [Accepted: 02/25/2011] [Indexed: 02/07/2023]
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12
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Nagl S, Schulze P, Ohla S, Beyreiss R, Gitlin L, Belder D. Microfluidic chips for chirality exploration. Anal Chem 2011; 83:3232-8. [DOI: 10.1021/ac200150w] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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13
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Elbashir AA, Aboul-Enein HY. Applications of capillary electrophoresis with capacitively coupled contactless conductivity detection (CE-C4D) in pharmaceutical and biological analysis. Biomed Chromatogr 2010; 24:1038-44. [DOI: 10.1002/bmc.1417] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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14
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Pormsila W, Gong XY, Hauser PC. Determination of the enantiomers of α-hydroxy- and α-amino acids in capillary electrophoresis with contactless conductivity detection. Electrophoresis 2010; 31:2044-8. [DOI: 10.1002/elps.201000127] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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15
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Allison SA, Pei H, Baek S, Brown J, Lee MY, Nguyen V, Twahir UT, Wu H. The dependence of the electrophoretic mobility of small organic ions on ionic strength and complex formation. Electrophoresis 2010; 31:920-32. [DOI: 10.1002/elps.200900625] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Xia S, Zhang L, Lu M, Qiu B, Chi Y, Chen G. Enantiomeric separation of chiral dipeptides by CE-ESI-MS employing a partial filling technique with chiral crown ether. Electrophoresis 2010; 30:2837-44. [PMID: 19655329 DOI: 10.1002/elps.200800799] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Enantiomer of chiral dipeptides were separated by CE-ESI-MS in a bare fused-silica capillary using (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid (18C6H4) as the chiral selector. As 18C6H4 is a kind of nonvolatile chiral selector, in order to prevent from 18C6H4 into the ion-source of CE-ESI-MS, a partial filling technique was employed in this study. Some dipeptides with one chiral center or two chiral centers, such as DL-Leu-DL-Leu, D-Ala-D-Ala and L-Ala-L-Ala, Gly-D-Phe and Gly-L-Phe were used to evaluate this CE-ESI-MS system. Optimized conditions were achivevd with 2.0 mol/L acetic acid (pH 2.15) as the running electrolyte, 5 mM 18C6H4 in 3.0 mol/L acetic acid (pH 2.00) was injected hydrodynamically (50 mbar for 960 s) before sample injection. In total 7.5 mM acetic acid in 80% v/v methanol-water was used as the sheath liquid, and 20 kV applied voltage was used. Under the optimum conditions, these dipeptides were separated and detected. LODs (defined as S/N=3) of this method were 0.20, 0.10, 0.05 and 0.10 micromol/L for D-Ala-D-Ala, L-Ala-L-Ala, DL-Leu-DL-Leu, Gly-L-Phe and Gly-D-Phe, respectively. The RSDs (n=7) of the method were 0.68-2.08% for migration times and 2.32-5.24% for peak areas. The proposed method was also successfully applied to the enantioselective analysis of these dipeptides in the spiked serum samples with satisfactory results.
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Affiliation(s)
- Shifei Xia
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Department of Chemistry, Fuzhou University, Fuzhou, Fujian, P. R. China
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18
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Sánchez-Hernández L, GarcÃa-Ruiz C, Luisa Marina M, Luis Crego A. Recent approaches for enhancing sensitivity in enantioseparations by CE. Electrophoresis 2010; 31:28-43. [DOI: 10.1002/elps.200900429] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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19
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Chang Guo C, Lei Guang L, Yu Jun S, Yu Ping L. AC impedance characteristics of capacitively coupled contactless conductivity detector cell in capillary electrophoresis. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2009.06.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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20
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Nagl S, Schulze P, Ludwig M, Belder D. Progress in microchip enantioseparations. Electrophoresis 2009; 30:2765-72. [DOI: 10.1002/elps.200900153] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Johns C, Breadmore MC, Macka M, Ryvolová M, Haddad PR. Recent significant developments in detection and method development for the determination of inorganic ions by CE. Electrophoresis 2009; 30 Suppl 1:S53-67. [DOI: 10.1002/elps.200900103] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Scriba GKE. Recent developments in peptide stereoisomer separations by capillary electromigration techniques. Electrophoresis 2009; 30 Suppl 1:S222-8. [DOI: 10.1002/elps.200900023] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Schuchert-Shi A, Hauser PC. Peptic and tryptic digestion of peptides and proteins monitored by capillary electrophoresis with contactless conductivity detection. Anal Biochem 2009; 387:202-7. [PMID: 19454244 DOI: 10.1016/j.ab.2009.01.025] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2008] [Revised: 01/20/2009] [Accepted: 01/21/2009] [Indexed: 10/21/2022]
Abstract
The feasibility of monitoring the peptic and tryptic digestion of peptides and proteins with capillary electrophoresis using contactless conductivity detection was investigated. The peptide minigastrin I and the proteins cytochrome c from bovine heart, human serum albumin (HSA), myoglobin, and bovine serum albumin (BSA) were digested off-line with pepsin, and the resulting peptide and amino acid fragments were successfully separated and detected by conductivity measurement. Cytochrome c and myoglobin were also subjected to off-line cleavage with trypsin. On-line digestion using the electrophoretically mediated microanalysis (EMMA) approach was demonstrated with cytochrome c and apomyoglobin using trypsin.
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Kubáň P, Hauser PC. Ten years of axial capacitively coupled contactless conductivity detection for CZE - a review. Electrophoresis 2009; 30:176-88. [DOI: 10.1002/elps.200800478] [Citation(s) in RCA: 181] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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