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Repassy L, Juvancz Z, Bodane-Kendrovics R, Kaleta Z, Hunyadi C, Riszter G. Structure-Chiral Selectivity Relationships of Various Mandelic Acid Derivatives on Octakis 2,3-di-O-acetyl-6-O-tert-butyldimethylsilyl-gamma-cyclodextrin Containing Gas Chromatographic Stationary. Int J Mol Sci 2023; 24:15051. [PMID: 37894730 PMCID: PMC10606619 DOI: 10.3390/ijms242015051] [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: 08/17/2023] [Revised: 09/12/2023] [Accepted: 10/05/2023] [Indexed: 10/29/2023] Open
Abstract
Frequently, a good chiral separation is the result of long trial and error processes. The three-point interaction mechanisms require the fair geometrical fitting and functional group compatibility of the interacting groups. Structure-chiral selectivity correlations are guidelines that can be established via trough systematic studies using model compounds. The enantiorecognition of the test compounds was studied on an octakis 2,3-Di-O-acetyl-6-O-tert-butyldimethylsilyl-gamma-cyclodextrin (TBDMSDAGCD) chiral selector. In our work, mandelic acid and its variously substituted compounds were used as model compounds to establish adaptable rules for other enantiomeric pairs. The mandelic acid and its modified compounds were altered at both their carboxyl and hydroxyl positions to test the key interaction forces of the chiral recognition processes. Ring- and alkyl-substituted mandelic acid derivatives were also used in our experiments. The chiral selectivity values of 20 test compounds were measured and extrapolated to 100 °C. The hydrogen donor abilities of test compounds improved their chiral selectivities. The inclusion phenomenon also played a role in chiral recognition processes in several cases. Enantiomer elution reversals were observed for different derivatives of hydroxyl groups, providing evidence for the multimodal character of the selector. The results of our research can serve as guidelines to achieve appropriate chiral separation for other enantiomeric pairs.
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Affiliation(s)
- Levente Repassy
- Rejtő Sándor Faculty of Light Industry and Environmental Engineering, Institute of Environmental Engineering and Natural Science, Óbuda University, Doberdó út 6, H-1034 Budapest, Hungary; (L.R.); (R.B.-K.)
| | - Zoltan Juvancz
- Rejtő Sándor Faculty of Light Industry and Environmental Engineering, Institute of Environmental Engineering and Natural Science, Óbuda University, Doberdó út 6, H-1034 Budapest, Hungary; (L.R.); (R.B.-K.)
| | - Rita Bodane-Kendrovics
- Rejtő Sándor Faculty of Light Industry and Environmental Engineering, Institute of Environmental Engineering and Natural Science, Óbuda University, Doberdó út 6, H-1034 Budapest, Hungary; (L.R.); (R.B.-K.)
| | - Zoltan Kaleta
- Department of Organic Chemistry, Semmelweis University, Hőgyes Endre Street 7, H-1092 Budapest, Hungary;
- Pro-Research Laboratory, Progressio Engineering Bureau Ltd., Muhar Street 54, H-1028 Budapest, Hungary;
| | - Csaba Hunyadi
- Pro-Research Laboratory, Progressio Engineering Bureau Ltd., Muhar Street 54, H-1028 Budapest, Hungary;
- Higher Education and Industrial Cooperation Centre, Institute of Chemistry, University of Miskolc, Egyetem út 1, H-3515 Miskolc, Hungary
| | - Gergo Riszter
- Department of Organic Chemistry, Semmelweis University, Hőgyes Endre Street 7, H-1092 Budapest, Hungary;
- Pro-Research Laboratory, Progressio Engineering Bureau Ltd., Muhar Street 54, H-1028 Budapest, Hungary;
- Artificial Transporters Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Magyar Tudósok körútja 2, H-1117 Budapest, Hungary
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2
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Porrà, Quaglia MG, Fanali S. Determination of fenfluramine enantiomers in pharmaceutical formulations by capillary zone electrophoresis. Chromatographia 2014. [DOI: 10.1007/bf02688055] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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3
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Elbashir AA, Aboul-Enein HY. Capillary Electrophoresis and Molecular Modeling as a Complementary Technique for Chiral Recognition Mechanism. Crit Rev Anal Chem 2013. [DOI: 10.1080/10408347.2013.803358] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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4
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Zhou LM, Nie MY, Wang QH, Zhu DQ, Shen HQ. Enthalpy-entropy compensation effect in gas chromatographic enantiomeric separation. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.19990170409] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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5
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Deñola NL, Quiming NS, Catabay AP, Saito Y, Jinno K. Optimization of capillary electrophoretic enantioseparation for basic drugs with native β-CD as a chiral selector. Electrophoresis 2006; 27:2367-75. [PMID: 16718718 DOI: 10.1002/elps.200500943] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This study presents the advantages of the 20 microm inner diameter (id) capillary for the enantioseparation of ten basic drugs with native beta-CD as the chiral selector. The apparent binding constants of each enantiomeric pair were determined to calculate the optimum beta-CD concentration ([beta-CD]opt) and the optimization was subsequently carried out. Comparison of the 20 microm id with 50 microm id were made in terms of the results obtained in the optimization and detection limits. Applying the optimum conditions for each compound, reproducible results (RSD from 0-3; n>5) were obtained for the 20 microm id capillary. Although the sensitivity is lower in the 20 microm id capillary, the LOD determined using this capillary is still found to be acceptable for the ten basic drugs studied. Enhanced resolution and faster analysis times were the main advantages observed with the use of this capillary in enantioseparation.
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Affiliation(s)
- Nerissa L Deñola
- School of Materials Science, Toyohashi University of Technology, Toyohashi, Japan
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6
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Bicchi C, Brunelli C, Cravotto G, Rubiolo P, Galli M, Mendicuti F. Cyclodextrin derivatives in enantiomer GC separation of volatiles. Part XXI: Complexation of some terpenoids with 2-O-acetyl-3-O-methyl- and 2-O-methyl-3-O-acetyl-6-O-t-hexyldimethylsilyl-γ-cyclodextrins: Molecular Mechanics and Molecular Dynamics. J Sep Sci 2003. [DOI: 10.1002/jssc.200301560] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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7
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Ramos MDCKV, Teixeira LHP, de Aquino Neto FR, Barreiro EJ, Rodrigues CR, Fraga CAM. Chiral separation of gamma-butyrolactone derivatives by gas chromatography on 2,3-di-O-methyl-6-O-tert.-butyldimethylsilyl-beta-cyclodextrin. J Chromatogr A 2003; 985:321-31. [PMID: 12580500 DOI: 10.1016/s0021-9673(02)01824-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The chiral GC separation of 2-alkyl-2-keto-gamma-butyrolactone derivatives and their alcohol analogs using 2,3-di-O-methyl-6-O-tert.-butyldimethylsilyl-beta-cyclodextrin (DIMETBCD) as chiral selector was discussed. The results, supported by the ketone preliminary molecular modelling calculations, suggest that the chiral recognition for DIMETBCD depends more on the geometry than on the polarity of the alkyl substituents on the butyrolactones. Hydrogen bonds and alkyl group steric effects should be an important function of the alcohol chiral recognition for DIMETBCD. Comparison of the retention times of the alcohol derivatives, in achiral and chiral stationary phases, suggests a specific structural effect for the cyclodextrin selctor.
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Affiliation(s)
- Maria da Conceição K V Ramos
- Laboratório de Desenvolvimento Tecnológico (LADETEC), Centro de Tecnologia, Bloco A. Sala 607, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21949-900, Brazil.
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8
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Bicchi C, Brunelli C, Cravotto G, Rubiolo P, Galli M. Cyclodextrin derivatives in GC separation of racemates of different volatility Part XVIII: 2-methyl-3-acetyl- and 2-acetyl-3-methyl-6-O-t-hexyldimethylsilyl-γ-cyclodextrin derivatives. J Sep Sci 2002. [DOI: 10.1002/1615-9314(20020201)25:3<125::aid-jssc125>3.0.co;2-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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9
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Seino M, Oishi M, Imae I, Kawakami Y. Formation of Poly(silsesquioxane) Gel Containing Optically Active 1,3-Dimethyl-1,3-diphenyldisiloxane as a Connecting Unit. Polym J 2002. [DOI: 10.1295/polymj.34.43] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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10
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Gas chromatographic enantiomer separation on single and mixed cyclodextrin derivative chiral stationary phases. Chromatographia 2000. [DOI: 10.1007/bf02505413] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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12
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Bucaille N, Vaton-Chanvrier L, Combret Y, Combret JC. Cyclocholates as Chiral Selectors for Capillary Gas Chromatography - Effect of Temperature Conditioning on the Chromatographic Behavior of the Stationary Phase. ACTA ACUST UNITED AC 1999. [DOI: 10.1002/(sici)1521-4168(19991201)22:12<671::aid-jhrc671>3.0.co;2-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Zhu X, Lin B, Jakob A, Epperlein U, Koppenhoefer B. Optimization and Parameter Study for Chiral Separation by Capillary Electrophoresis. ACTA ACUST UNITED AC 1999. [DOI: 10.1002/(sici)1521-4168(19990801)22:8<449::aid-jhrc449>3.0.co;2-k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Bicchi C, Cravotto G, D'amato A, Rubiolo P, Galli A, Galli M. Cyclodextrin derivatives in gas chromatographic separation of racemates with different volatility. Part XV: 6-O-t-butyldimethylsilyl- versus 6-O-t-hexyldimethylsilyl-? and -? derivatives. ACTA ACUST UNITED AC 1999. [DOI: 10.1002/(sici)1520-667x(1999)11:7<487::aid-mcs1>3.0.co;2-b] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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Experimental design methodologies to optimize the CE separation of epinephrine enantiomers. Chromatographia 1998. [DOI: 10.1007/bf02467710] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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16
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Beier T, Höltje HD. Modified cyclodextrins as chiral selectors: molecular modelling investigations on the enantioselective binding properties of heptakis(2,3-di-O-methyl-6-O-tert.-butyldimethylsilyl)-beta-cyclodextri n. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1998; 708:1-20. [PMID: 9653941 DOI: 10.1016/s0378-4347(97)00636-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Molecular modelling methods have been used to investigate the enantioselective binding properties of chiral dihydrofuranones on heptakis(2,3-di-O-methyl-6-O-tert.-butyldimethylsilyl)-beta-cyclod extrin in capillary gas chromatography. A conformational analysis of the modified beta-cyclodextrin was performed using annealed molecular dynamics. With the program GRID the molecular interaction potential for each of the received energetically reasonable structures of the beta-cyclodextrin and the dihydrofuranones was evaluated using different probe groups. The results of these computations have been used as starting points for constructing geometrically reasonable host-guest complexes between the beta-cyclodextrin and the dihydrofuranones. The subsequently performed molecular dynamics simulations yielded different complex states reflecting the conformational flexibility of the diastereomeric complexes. Considering the evaluated interaction energy between the beta-cyclodextrin and the dihydrofuranones as a measure of complex stability the results are in close agreement with the experimentally determined elution sequences. The methodology for the construction of the interaction model used in this study is capable of simulating the experimental data. We believe that it may serve as a basis for predictions of hitherto unknown elution sequences at modified cyclodextrins.
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Affiliation(s)
- T Beier
- Institute of Pharmacy, Free University of Berlin, Germany
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17
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Miranda E, Sánchez F, Sanz J, Jiménez MI, Martínez-Castro I. 2,3-Di-O-pentyl-6-O-tert-butyldimethylsilyl-β-cyclodextrin as a Chiral Stationary Phase in Capillary Gas Chromatography. ACTA ACUST UNITED AC 1998. [DOI: 10.1002/(sici)1521-4168(19980401)21:4<225::aid-jhrc225>3.0.co;2-z] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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Enantioselective Separations. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0301-4770(08)60303-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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19
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Benick� E, Tak�?ov� D, Krup?�k J, Ska?�ni I, Onuska F, Terry K. Gas chromatographic separation of PCB atropisomers on cyclodextrin stationary phases. Chirality 1998. [DOI: 10.1002/(sici)1520-636x(1998)10:6<540::aid-chir7>3.0.co;2-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Guillaume YC, Guinchard C. New Statistical Approach to a Gas Chromatography Retention Model: Application to Dichlorophenol Isomers. J Phys Chem B 1997. [DOI: 10.1021/jp971037h] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yves Claude Guillaume
- Laboratoire de Chimie Analytique, Faculté de Médecine et Pharmacie, Place St. Jacques, 25030 Besancon, Cedex, France
| | - Christiane Guinchard
- Laboratoire de Chimie Analytique, Faculté de Médecine et Pharmacie, Place St. Jacques, 25030 Besancon, Cedex, France
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21
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Desiderio C, Polcaro C, Padiglioni P, Fanali S. Enantiomeric separation of acidic herbicides by capillary electrophoresis using vancomycin as chiral selector. J Chromatogr A 1997. [DOI: 10.1016/s0021-9673(97)00586-4] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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22
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Computerized optimization of selectivity for direct capillary gas chromatographic multicomponent separations of enantiomers. J Chromatogr A 1997. [DOI: 10.1016/s0021-9673(97)00409-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Kim BE, Lee KP, Park KS, Lee SH, Park JH. Enantioselectivity of 6-O-alkyldimethylsilyl-2,3-di-O-methyl-β-cyclodextrins as chiral stationary phases in capillary GC. Chromatographia 1997. [DOI: 10.1007/bf02495325] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Kim BE, Lee KP, Park KS, Lee (deceased) SH, Park JH. Comparison of different heptakis(6-O-alkyldimethylsilyl-2-3-di-O-ethyl)-β-cyclodextrins as chiral stationary phases in capillary GC. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/jhrc.1240200808] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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25
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Kim BE, Lee (deceased) SH, Park KS, Lee KP, Park JH. Enantiomer separations by capillary GC on modified gyclodextrins. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/jhrc.1240200405] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Rotthaus O, Krüger D, Demuth M, Schaffner K. Reductions of keto esters with baker's yeast in organic solvents - a comparison with the results in water. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(96)01067-8] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Consequence of diluting modified β-cyclodextrins in a side-chain crown ether polysiloxane and in a side-chain liquid-crystalline polysiloxane-containing crown ether as stationary phases in capillary gas chromatography. Chromatographia 1996. [DOI: 10.1007/bf02293008] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Bicchi C, D'Amato A, Manzin V, Galli A, Galli M. Cyclodextrin derivatives in the gas chromatographic separation of racemic mixtures of volatile compounds X. 2,3-Di-O-ethyl-6-O-tert.-butyldimethylsilyl-β- and −γ-cyclodextrins. J Chromatogr A 1996. [DOI: 10.1016/0021-9673(96)00254-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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Affiliation(s)
- Gary A. Eiceman
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003
| | - Herbert H. Hill
- Department of Chemistry, Washington State University, Pullman, Washington 99164
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30
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Abstract
Separation of optical isomers of compounds of pharmaceutical interest by capillary electrophoretic techniques is reviewed. The direct and indirect separation method, as well as the main resolution mechanisms and the parameters influencing the stereoselectivity are discussed considering capillary zone electrophoresis, micellar electrokinetic chromatography, isotachophoresis and electrochromatography. Several chiral selectors have been successfully used in CE for chiral separation, including cyclodextrins and their derivatives, modified crown-ethers, proteins, antibiotics, linear saccharides and chiral surfactants. Only applications in the pharmaceutical field with the most important experimental conditions are summarised in the Tables reported in this paper. The chiral analyses of drugs in real samples like biological fluids or pharmaceutical formulations are also reported.
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Affiliation(s)
- S Fanali
- Istituto di Cromatografia del C.N.R., Area della Ricerca di Roma, Italy
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31
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Dönnecke J, Paul C, König WA, Svensson LA, Gyllenhaal O, Vessman J. Immobilization of heptakis 6-O-tert-butyldimethylsilyl-2,3-di-O-methyl)-β-cyclodextrin for capillary gas chromatography and SFC and micro-liquid chromatography. ACTA ACUST UNITED AC 1996. [DOI: 10.1002/(sici)1520-667x(1996)8:7<495::aid-mcs6>3.0.co;2-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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32
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33
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Desiderio C, Fanali S. Use of negatively charged sulfobutyl ether-β-cyclodextrin for enantiomeric separation by capillary electrophoresis. J Chromatogr A 1995. [DOI: 10.1016/0021-9673(95)00550-7] [Citation(s) in RCA: 116] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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34
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Porrà R, Quaglia MG, Fanali S. Determination of fenfluramine enantiomers in pharmaceutical formulations by capillary zone electrophoresis. Chromatographia 1995. [DOI: 10.1007/bf02318609] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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35
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Bicchi C, D'Amato A, Manzin V, Galli A, Galli M. Cyclodextrin derivatives in GC separation of racemic mixtures of volatiles. Part IX. The influence of the different polysiloxanes as diluting phase for 2,3-di-O-acetyl-6-O-t-butyldimethylsilyl-β-cyclodextrin on the separation of some racemates. ACTA ACUST UNITED AC 1995. [DOI: 10.1002/mcs.1220070405] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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36
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Bicchi C, D'amato A, Manzin V, Galli A, Galli M. Cyclodextrin derivatives for GC separation of racemic mixtures of volatile compounds. Part VIII: 2,6-di-O-methyl-3-O-pentyl-γ-cyclodextrin and 2,6-di-O-methyl-3-O-(4-oxo-pentyl)- and 2,6-di-O-pentyl-3-O-(4-oxo-pentyl)-β-and -γ-cyclodextrins. ACTA ACUST UNITED AC 1995. [DOI: 10.1002/jhrc.1240180506] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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37
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Jaques K, Buda WM, Venema A, Sandra P. Enantioselective separations by capillary gas chromatography on derivatized cyclodextrins. Part IV: Enantioselective interaction model of 2,2-dialkyl-4-alkoxycarbonyl-1,3-dioxolane derivatives on some substituted cyclodextrins. ACTA ACUST UNITED AC 1995. [DOI: 10.1002/mcs.1220070208] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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38
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Maas B, Dietrich A, Beck T, Börner S, Mosandl A. Di-tert-butyldimethylsilylated cyclodextrins as chiral stationary phases: Thermodynamic investigations. ACTA ACUST UNITED AC 1995. [DOI: 10.1002/mcs.1220070110] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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39
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Zhang T, Francotte E. Chromatographic properties of composite chiral stationary phases based on cellulose derivatives. Chirality 1995. [DOI: 10.1002/chir.530070607] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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40
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Use of esterified and unesterified dipentylated γ-, β- and α-cyclodextrins as gas chromatographic stationary phases to indicate the structure of monoterpenoid constituents of volatile oils. J Chromatogr A 1994. [DOI: 10.1016/0021-9673(94)80615-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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