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Ciogli A, Pierri G, Kotoni D, Cavazzini A, Botta L, Villani C, Kocergin J, Gasparrini F. Toward enantioselective nano ultrahigh-performance liquid chromatography with Whelk-O1 chiral stationary phase. Electrophoresis 2014; 35:2819-23. [DOI: 10.1002/elps.201400240] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 06/25/2014] [Accepted: 06/30/2014] [Indexed: 12/23/2022]
Affiliation(s)
- Alessia Ciogli
- Department of Drug Chemistry and Technology; “Sapienza” University of Rome; Rome Italy
| | - Giuseppe Pierri
- Department of Drug Chemistry and Technology; “Sapienza” University of Rome; Rome Italy
| | - Dorina Kotoni
- Department of Drug Chemistry and Technology; “Sapienza” University of Rome; Rome Italy
| | - Alberto Cavazzini
- Department of Chemistry and Pharmaceutical Sciences; University of Ferrara; Ferrara Italy
| | - Lorenzo Botta
- Department of Pharmacy; University of Naples Federico II; Naples Italy
| | - Claudio Villani
- Department of Drug Chemistry and Technology; “Sapienza” University of Rome; Rome Italy
| | | | - Francesco Gasparrini
- Department of Drug Chemistry and Technology; “Sapienza” University of Rome; Rome Italy
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2
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Enantioseparation of basic chiral compounds on a clindamycin phosphate-silica/zirconia hybrid monolith by capillary electrochromatography. J Chromatogr A 2014; 1356:289-93. [DOI: 10.1016/j.chroma.2014.06.089] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 06/26/2014] [Accepted: 06/26/2014] [Indexed: 11/24/2022]
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3
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Bragg W, Shamsi SA. High Throughput Analysis of Chiral Compounds Using Capillary Electrochromatography (CEC) and CEC-Mass Spectrometry with Cellulose Based Stationary Phases. SEP SCI TECHNOL 2013; 48:2589-2599. [PMID: 25264392 DOI: 10.1080/01496395.2012.719984] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
To fulfill the ever growing demand for rapid chiral analysis, this research presents an approach for highthroughput enantiomeric separations and sensitive detection of model chiral analytes using capillary electrochromatography (CEC) with UV and MS detection. This was achieved utilizing a short 7 cm CEC columns packed with cellulose tris (3,5-dimethyl-phenylcarbamate) (CDMPC) or sulfonated cellulose tris (3,5-dimethylphenylcarbamate) (CDMPC-SO3) chiral stationary phases (CSPs) applying outlet side injections in CEC-UV. The separation performance was compared between CDMPC and CDMPC-SO3 CSPs for rapid enantio-separation in CEC-UV mode. In addition, using a high sensitivity UV-flow cell in combination with outlet side injections, the S/N and hence the limit of detection of chiral drug could be improved. The 7-cm packed column was also used with traditional inlet injections for CEC coupled to a low-cost single-quadrupole MS. While outlet side injection was not possible in CEC-MS due to instrumentation constraints, the combined use of a short 7 cm column packed with CDMPC-SO3 CSP provided several fold higher throughput. Both CEC-UV and CEC-MS with short packed bed has the potential for a simple, sensitive and cost-effective method for enantiomeric drug profiling in biological samples.
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Affiliation(s)
- William Bragg
- Department of Chemistry, Center for Biotechnology and Drug Design, Georgia State University, Atlanta, GA, USA
| | - Shahab A Shamsi
- Department of Chemistry, Center for Biotechnology and Drug Design, Georgia State University, Atlanta, GA, USA
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4
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Pecularities of determining the content of 3-substituted 4-hydroxycoumarins in disinfectants and drugs. Pharm Chem J 2013. [DOI: 10.1007/s11094-013-0906-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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5
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Fernandes C, Palmeira A, Santos A, Tiritan ME, Afonso C, Pinto MM. Enantioresolution of chiral derivatives of xanthones on (S,S)-Whelk-O1 and L-phenylglycine stationary phases and chiral recognition mechanism by docking approach for (S,S)-Whelk-O1. Chirality 2012; 25:89-100. [PMID: 23229954 DOI: 10.1002/chir.22112] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2012] [Accepted: 08/04/2012] [Indexed: 01/28/2023]
Abstract
The resolution of seven enantiomeric pairs of chiral derivatives of xanthones (CDXs) on (S,S)-Whelk-O1 and L-phenylglycine chiral stationary phases (CSPs) was systematically investigated using multimodal elution conditions (normal-phase, polar-organic, and reversed-phase). The (S,S)-Whelk-O1 CSP, under polar-organic conditions, demonstrated a very good power of resolution for the CDXs possessing an aromatic moiety linked to the stereogenic center with separation factor and resolution factor ranging from 1.91 to 7.55 and from 6.71 to 24.16, respectively. The chiral recognition mechanisms were also investigated for (S,S)-Whelk-O1 CSP by molecular docking technique. Data regarding the CSP-CDX molecular conformations and interactions were retrieved. These results were in accordance with the experimental chromatographic parameters regarding enantioselectivity and enantiomer elution order. The results of the present study fulfilled the initial objectives of enantioselective studies of CDXs and elucidation of intermolecular CSP-CDX interactions.
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Affiliation(s)
- Carla Fernandes
- Centro de Química Medicinal da, Universidade do Porto (CEQUIMED-UP), Porto, Portugal
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6
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The adsorption of Naproxen enantiomers on the chiral stationary phase Whelk-O1 under reversed-phase conditions: The effect of buffer composition. J Chromatogr A 2010; 1217:7055-64. [DOI: 10.1016/j.chroma.2010.08.073] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2010] [Revised: 07/29/2010] [Accepted: 08/26/2010] [Indexed: 11/24/2022]
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7
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The adsorption of Naproxen enantiomers on the chiral stationary phase ()-Whelk-O1 under reversed-phase conditions: The effect of mobile phase composition. J Chromatogr A 2010; 1217:2871-8. [DOI: 10.1016/j.chroma.2010.02.066] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2009] [Revised: 02/16/2010] [Accepted: 02/24/2010] [Indexed: 11/21/2022]
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8
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On the enantioselectivity of the mass transfer kinetics and the adsorption equilibrium of Naproxen on the chiral stationary phase ()-Whelk-O1 under reversed-phase conditions. J Chromatogr A 2010; 1217:1320-31. [DOI: 10.1016/j.chroma.2009.12.066] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2009] [Revised: 12/16/2009] [Accepted: 12/21/2009] [Indexed: 11/18/2022]
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9
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Asnin L, Gritti F, Kaczmarski K, Guiochon G. Features of the adsorption of Naproxen on the chiral stationary phase (S,S)-Whelk-O1 under reversed-phase conditions. J Chromatogr A 2010; 1217:264-75. [DOI: 10.1016/j.chroma.2009.11.039] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2009] [Revised: 11/09/2009] [Accepted: 11/13/2009] [Indexed: 11/30/2022]
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10
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Bragg W, Norton D, Shamsi SA. Optimized separation of beta-blockers with multiple chiral centers using capillary electrochromatography-mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2009; 875:304-16. [PMID: 18619928 DOI: 10.1016/j.jchromb.2008.06.028] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2008] [Revised: 06/06/2008] [Accepted: 06/17/2008] [Indexed: 10/21/2022]
Abstract
This work focuses on the simultaneous analysis of beta-blockers with multiple stereogenic centers using capillary electrochromatography-mass spectrometry (CEC-MS) with a vancomycin stationary phase. The critical mobile phase variables (composition of organic solvents, acid/base ratios) as well as column temperature and electric field strength, effecting enantioresolution and analysis time were first optimized sequentially. Next, to achieve global optimum a multivariate D-optimal design was used. Although multivariate approach did not improve enantioresolution any further, analysis time was significantly reduced. Under optimum CEC-MS conditions, all stereoisomers were resolved with resolution in the range 1.0-3.1 in less than 60 min with an average signal-to-noise (S/N) greater than 1000. The developed CEC-MS method has the potential to emerge as a screening method for analysis of multiple chiral compounds using a single protocol using the same column and mobile phase conditions, thus reducing the operation time and cost.
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Affiliation(s)
- William Bragg
- Department of Chemistry, Center of Biotechnology and Drug Design, Georgia State University, Atlanta, GA 30303, USA
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11
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Zheng J, Bragg W, Hou J, Lin N, Chandrasekaran S, Shamsi SA. Sulfated and sulfonated polysaccharide as chiral stationary phases for capillary electrochromatography and capillary electrochromatography-mass spectrometry. J Chromatogr A 2009; 1216:857-72. [PMID: 19108837 PMCID: PMC2752677 DOI: 10.1016/j.chroma.2008.11.082] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2008] [Revised: 11/16/2008] [Accepted: 11/18/2008] [Indexed: 11/21/2022]
Abstract
The applications of polysaccharide phenyl carbamate derivatives as chiral stationary phases (CSPs) for capillary electrochromatography (CEC) are often hindered by longer retention times, especially using a normal-phase (NP) eluent due to very low electroosmotic flow (EOF). Therefore, in this study, we propose an approach for the aforementioned problems by introducing two new types of negatively charged sulfate and sulfonated groups for polysaccharide CSPs. These CSPs were utilized to pack CEC columns for enantioseparation with a NP eluent. Compared to conventional cellulose tris(3,5-dimethylphenyl carbamate) or CDMPC CSPs, the sulfated CDMPC CSP (sulfur content 4.25%, w/w) shortened the analysis time up to 50% but with a significant loss of enantiomeric resolution (approximately 60%). On the other hand, the sulfonated CDMPC CSP (sulfur content 1.76%, w/w) not only provided fast throughput but also maintained excellent resolving power. In addition, its synthesis is much more straightforward than the sulfated one. Furthermore, we studied several stationary phase parameters (CSP loading and silica gel pore size) and mobile phase parameters (including type of mobile phase and its composition) to evaluate the throughput and enantioselectivity. Using the optimized conditions, a chiral pool containing 66 analytes was screened to evaluate the enantioselectivity under three different mobile phase modes (i.e., NP, polar organic phase (POP) and reversed-phase (RP) eluents). Among these mobile phase modes, the RP mode showed the highest success rate, whereas some degree of complementary enantioselectivity was observed with NP and POP. Finally, the feasibility of applying this CSP for CEC-MS enantioseparation using internal tapered column was evaluated with NP, POP and RP eluents. In particular, the NP-CEC-MS provided significantly enhanced sensitivity when methanol was replaced with isopropanol in the sheath liquid. Using aminoglutethimide as model chiral analyte, all three modes of CEC-MS demonstrated excellent durability as well as excellent reproducibility of retention time and enantioselectivity.
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Affiliation(s)
- Jie Zheng
- Department of Chemistry, Center of Biotechnology and Drug Design, Georgia State University, Atlanta, GA 30303, USA
- Abbott Laboratories, North Chicago, IL 60064, USA
| | - William Bragg
- Department of Chemistry, Center of Biotechnology and Drug Design, Georgia State University, Atlanta, GA 30303, USA
| | - Jingguo Hou
- Department of Clinical Sciences and Administration, College of Pharmacy, University of Houston, Texas Medical Center, Houston, TX 77030, USA
| | - Na Lin
- Department of Human Genetics, Division of Medical Genetics, Emory University, Decatur, GA 30033, USA
| | - Sekar Chandrasekaran
- Department of Chemistry, Center of Biotechnology and Drug Design, Georgia State University, Atlanta, GA 30303, USA
| | - Shahab A. Shamsi
- Department of Chemistry, Center of Biotechnology and Drug Design, Georgia State University, Atlanta, GA 30303, USA
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12
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Ding GS, Tang AN. Capillary electrochromatographic separation of racemates on a norvancomycin-bonded monolithic column under reversed-phase conditions. J Chromatogr A 2008; 1208:232-8. [DOI: 10.1016/j.chroma.2008.08.075] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2008] [Revised: 08/21/2008] [Accepted: 08/21/2008] [Indexed: 11/30/2022]
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13
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Qu Q, Zhang X, Shen M, Liu Y, Hu X, Yang G, Wang C, Zhang Y, Yan C. Open-tubular capillary electrochromatography using a capillary coated with octadecylamine-capped gold nanoparticles. Electrophoresis 2008; 29:901-9. [DOI: 10.1002/elps.200700409] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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14
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Preinerstorfer B, Lämmerhofer M. Recent accomplishments in the field of enantiomer separation by CEC. Electrophoresis 2007; 28:2527-65. [PMID: 17607806 DOI: 10.1002/elps.200700070] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The present review intends to summarize recent developments in the field of enantioselective separations and analysis by CEC. It covers studies published in English language in common peer-reviewed journals within the period between 2003 and 2006. Both, methods making use of chiral mobile phase additives as well as chiral stationary phases for electrochromatographic enantiomer separations, are reviewed. Achievements that have been made on the various column technologies, such as open-tubular, particle-packed, inorganic, organic and particle-fixed (hybrid-type) monolithic as well as molecularly imprinted polymer phases, are discussed.
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Affiliation(s)
- Beatrix Preinerstorfer
- Christian Doppler Laboratory for Molecular Recognition Materials, Institute of Analytical Chemistry and Food Chemistry, University of Vienna, Vienna, Austria
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15
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Zheng J, Shamsi SA. Simultaneous enantioseparation and sensitive detection of eight beta-blockers using capillary electrochromatography-electrospray ionization-mass spectrometry. Electrophoresis 2006; 27:2139-51. [PMID: 16645981 DOI: 10.1002/elps.200500874] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The feasibility of using vancomycin chiral stationary phase (CSP) and polar organic eluent is investigated for simultaneous enantioseparation of eight beta-blockers using CEC coupled to ESI mass spectrometric detection (ESI-MS). The internally tapered capillaries were utilized to pack CEC-MS columns. As compared to externally tapered columns, the use of internally tapered columns demonstrated enhanced stability, durability, and reproducibility. A mixture containing methanol/ACN/acetic acid/triethylamine at 70:30:1.6:0.2 v/v/v/v was considered as optimum mobile phase since it provided a good compromise between resolution and analysis time. As expected, sheath liquid and ESI-MS parameters mainly influenced the detection sensitivity. Interestingly, structural information of beta-blockers was available by varying the MS fragmentor voltage using in-house CID in the scan mode. In order to maximize the chiral/achiral resolution, various column-coupling approaches using teicoplanin as complementary CSP to vancomycin were tested. Several changes in the elution order of beta-blockers were observed using multimodal CSPs with some improvement in chiral or achiral resolution. The quantitative aspects of the CEC-MS method were demonstrated using R- and S-talinolol as internal standards. The calibration curves of beta-blockers showed good linearity in the range of 3-600 microM. The enantiomer of beta-blockers at a concentration of 30 nM was detectable. Furthermore, both 0.1 and 1% of the S-enantiomer could be precisely quantified in the presence of 99.9 and 99% of the R-isomer of beta-blocker.
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Affiliation(s)
- Jack Zheng
- Department of Chemistry, Center of Biotechnology and Drug Design, Georgia State University, Atlanta, 30302, USA
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16
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Liu H, Yu A, Liu F, Shi Y, Han L, Chen Y. Chiral separation of cefadroxil by capillary electrochromatography. J Pharm Biomed Anal 2006; 41:1376-9. [PMID: 16600557 DOI: 10.1016/j.jpba.2006.02.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2005] [Revised: 02/09/2006] [Accepted: 02/15/2006] [Indexed: 10/24/2022]
Abstract
In this paper, the chiral separation of cefadroxil was studied by capillary electrochromatography. Monolithic capillary column was prepared for the separation of cefadroxil enantiomers. The optimum buffer contained 28.5 mmol/L sodium acetate, 0.95% (v/v) acetic acid, 19 mmol/L beta-cyclodextrin (beta-CD) and 5% (v/v) isopropanol in formamide solution (pH 7.0), with the running voltage of 12 kV, the UV detector wavelength of 254 nm, the sample injected time of 8s and the temperature of 25 degrees C. Under these conditions, the column efficiency of cefadroxil enantiomers were N1=5324 and N2=23,768 with a selectivity factor (alpha) of 1.056 and resolution (Rs) of 0.978. The effect of buffer pH value, beta-CD concentration, organic modifier (isopropanol) concentration and voltage was also investigated for the separation by CEC.
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Affiliation(s)
- Haixing Liu
- Department of Chemistry, Weifang University, Weifang 261061, China.
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17
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Mangelings D, Maftouh M, Vander Heyden Y. Capillary electrochromatographic chiral separations with potential for pharmaceutical analysis. J Sep Sci 2005; 28:691-709. [PMID: 15938179 DOI: 10.1002/jssc.200400077] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The use of capillary electrochromatography as a chiral separation technique for pharmaceutical applications is reviewed. Publications of the past 10 years that provide a potential practical application in pharmaceutical analysis are considered. Method development or validation, separation strategies, and potential routine analysis by the methods/applications cited are the main subjects on which we focused our attention. The indirect chiral separation method was only used once in CEC mode. In the direct chiral separations, the use of chiral stationary phases was obviously preferred over the use of chiral mobile phases with non-chiral stationary phases. Amongst the chiral stationary phases, those based on macrocyclic antibiotics and polysaccharide selectors were the most frequently used. Monolithic stationary phases also have several applications, but not so extended as those with packed capillary electrochromatography. The considered papers not only describe the applicability of the technique for relatively large sets of chiral analytes, they also showed that various types of stationary phases can be produced in-house in a simple manner. However, to survive as a mature separation technique, considerable time and effort are still needed to solve some disadvantages currently characterizing capillary electrochromatography.
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Affiliation(s)
- Debby Mangelings
- Department of Pharmaceutical and Biomedical Analysis, Pharmaceutical Institute, Vrije Universiteit Brussel-VUB, Laarbeeklaan 103, B-1090 Brussels, Belgium
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18
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Mangelings D, Tanret I, Matthijs N, Maftouh M, Massart DL, Vander Heyden Y. Separation strategy for acidic chiral pharmaceuticals with capillary electrochromatography on polysaccharide stationary phases. Electrophoresis 2005; 26:818-832. [PMID: 15714567 DOI: 10.1002/elps.200410190] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The effect of five factors on the capillary electrochromatographic enantioseparation of acidic compounds was studied using an experimental design. The studied factors were pH, acetonitrile content in the mobile phase, temperature, buffer concentration, and applied voltage. These experiments allowed defining a generic separation strategy applicable on acidic compounds with chemical and structural diversity. The starting screening conditions consist of a 45 mM ammonium formate electrolyte at pH 2.9 mixed with 65% acetonitrile, an applied voltage of 15 kV, and a temperature of 25 degrees C. The screening phase occasionally can be followed by an optimization procedure. Evaluation of the proposed strategy pointed out that it allows achieving baseline resolution within a relatively short time when a beginning of separation is obtained at the starting conditions. This strategy revealed enantioselectivity for 11 compounds out of 15, of which 10 could be baseline-separated after the proposed optimization steps.
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Affiliation(s)
- Debby Mangelings
- Department of Pharmaceutical and Biomedical Analysis, Pharmaceutical Institute, Vrije Universiteit Brussel-VUB, Brussels, Belgium
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Zheng J, Jann MW, Hon YY, Shamsi SA. Development of capillary zone electrophoresis-electrospray ionization-mass spectrometry for the determination of lamotrigine in human plasma. Electrophoresis 2005; 25:2033-2043. [PMID: 15237404 DOI: 10.1002/elps.200305823] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A method of coupling capillary zone electrophoresis (CZE) with electrospray ionization-mass spectrometry (ESI-MS) detection has been developed for monitoring an antiepileptic drug, lamotrigine (LTG) in human plasma. The CZE-MS was developed in three stages: (i) CZE separation and ESI-MS detection of LTG and tyramine (TRM, internal standard) were simultaneously optimized by studying the influence of CZE background electrolyte (BGE) pH, BGE ionic strength, and nebulizer pressure of the MS sprayer; (ii) sheath liquid parameters, such as pH, ionic strength, organic modifier content, and flow rate of the sheath liquid, were systematically varied under optimum CZE-MS conditions developed in the first stage; (iii) MS sprayer chamber parameters (drying gas temperature and drying gas flow rate) were varied for the best MS detection of LTG. The developed assay was finally applied for the determination of LTG in plasma samples. The linear range of LTG in plasma sample assay was between 0.1-5.0 microg/mL with a limit of detection as low as 0.05 microg/mL and run time less than 6 min. Finally, the concentration-time profile of LTG in human plasma sample was found to correlate well when CZE-ESI-MS was compared to a more established method of high-performance liquid chromatography with ultraviolet detection.
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Affiliation(s)
- Jack Zheng
- Department of Chemistry, Center of Biotechnology and Drug Design, Georgia State University, Atlanta, GA, USA
| | - Michael W Jann
- Department of Clinical and Administrative Science, Mercer University, Southern School of Pharmacy, Atlanta, GA, USA
| | - Yuen Yi Hon
- Clinical Pharmacokinetics, Research Laboratory, Clinical Center Pharmacy Department, National Institutes of Health, Bethesda, MA, USA
| | - Shahab A Shamsi
- Department of Chemistry, Center of Biotechnology and Drug Design, Georgia State University, Atlanta, GA, USA
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Vander Heyden Y, Mangelings D, Matthijs N, Perrin C. 18 Chiral separations. SEP SCI TECHNOL 2005. [DOI: 10.1016/s0149-6395(05)80062-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Zheng J, Shamsi SA. Combination of chiral capillary electrochromatography with electrospray ionization mass spectrometry: method development and assay of warfarin enantiomers in human plasma. Anal Chem 2004; 75:6295-305. [PMID: 14616014 DOI: 10.1021/ac030193j] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The hyphenation of chiral capillary electrochromatography (CEC) with electrospray ionization mass spectrometry (ESI-MS) is very challenging but promising due to the fact that it combines sensitivity with high specificity and selectivity. In this work, CEC capillaries packed with (3R,4S)-Whelk-O1 chiral stationary phase were used for simultaneous enantioseparation of (+/-)-warfarin and its internal standard, (+/-)-coumachlor. Furthermore, both the chiral CEC separation and MS detection parameters were examined in detail. First, the influence of different column fabrication was investigated. Second, enantioseparation was optimized by varying CEC parameters, including acetonitrile concentration, buffer pH, and ionic strength. Under the optimum chiral CEC conditions, ESI-MS parameters such as sheath liquid pH and composition, sheath liquid flow rate, drying gas flow rate, drying gas temperature, nebulizer pressure, and fragmentor voltage were investigated to achieve maximum MS signals of the separated enantiomers. Finally, using solid-phase extraction as sample preparation method, (+/-)-warfarin spiked in 100-microL human plasma samples were analyzed. The calibration curves showed good linearity for both (R)-warfarin (R = 0.9979) and (S)-warfarin (R = 0.9978) enantiomers. The experimental limit of detection was approximately 25 ng/mL for both enantiomers. Even though the data are still preliminary, we can state with confidence that chiral CEC-ESI-MS has the potential to establish itself as a very powerful technique for the determination of enantiomeric ratios in human body fluid.
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Affiliation(s)
- Jack Zheng
- Department of Chemistry, Center of Biotechnology and Drug Design, Georgia State University, Atlanta, Georgia 30303, USA
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