1
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Begato F, Penasa R, Licini G, Zonta C. Straight from the bottle! Wine and juice dicarboxylic acids as templates for supramolecular cage self-assembly. Chem Commun (Camb) 2021; 57:10019-10022. [PMID: 34505582 DOI: 10.1039/d1cc03804d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Two imine based supramolecular cages are able to self-assemble in the presence of a complex mixture like wine or fruit juices. Taking advantage of templating agents present in these mixtures the systems are able to form and to selectively encapsulate dicarboxylic systems present in the mixtures. This capability has been exploited to develop molecular systems able to report the enantiomeric excess and composition of (a)chiral dicarboxylic acids in fruit juices and wines using 1H-NMR.
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Affiliation(s)
- Federico Begato
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy.
| | - Roberto Penasa
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy.
| | - Giulia Licini
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy.
| | - Cristiano Zonta
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy.
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2
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Enantioseparation of Tartaric and Malic Acids in Wines by Ligand Exchange Capillary Electrophoresis Using Uncoated Fused Silica Capillary. Chromatographia 2016. [DOI: 10.1007/s10337-016-3099-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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3
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Yu Y, Liu W, Ma J, Tao Y, Qin Y, Kong Y. An efficient chiral sensing platform based on graphene quantum dot–tartaric acid hybrids. RSC Adv 2016. [DOI: 10.1039/c6ra18477d] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Hybrids of GQDs-l-(+)–TA and GQDs-d-(−)–TA are used for the construction of a pH-sensitive chiral sensing platform.
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Affiliation(s)
- Yin Yu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- School of Petrochemical Engineering
- Changzhou University
- Changzhou 213164
- China
| | - Wenjie Liu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- School of Petrochemical Engineering
- Changzhou University
- Changzhou 213164
- China
| | - Jianfeng Ma
- School of Environmental & Safety Engineering
- Changzhou University
- Changzhou 213164
- China
| | - Yongxin Tao
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- School of Petrochemical Engineering
- Changzhou University
- Changzhou 213164
- China
| | - Yong Qin
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- School of Petrochemical Engineering
- Changzhou University
- Changzhou 213164
- China
| | - Yong Kong
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- School of Petrochemical Engineering
- Changzhou University
- Changzhou 213164
- China
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4
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Zhao W, Li Y, Zhang Y, Zhang H, Yu H, Chen A. Determination of Cinchona Alkaloids by Capillary Electrophoresis with Novel Complex Formation. ANAL LETT 2015. [DOI: 10.1080/00032719.2015.1089258] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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5
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Aydoğan C, Karakoç V, Denizli A. Chiral ligand-exchange separation and determination of malic acid enantiomers in apple juice by open-tubular capillary electrochromatography. Food Chem 2015; 187:130-4. [DOI: 10.1016/j.foodchem.2015.04.062] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 04/15/2015] [Accepted: 04/17/2015] [Indexed: 10/23/2022]
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6
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Báthori NB, Jacobs A, Mei M, Nassimbeni LR. Resolution of malic acid by (+)-cinchonine and (–)-cinchonidine. CAN J CHEM 2015. [DOI: 10.1139/cjc-2014-0579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
(+)-Cinchonine and (–)-cinchonidine have been employed to resolve rac-malic acid. The resulting salts contain the D-malate anion in both cases. The cinchoninium and cinchonidinium L-malates were also crystallised, and the structures of all four salts were analysed in terms of their nonbonding interactions. All four structures display extensive hydrogen bonding, and it is shown that the D-malate salts are more efficiently packed.
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Affiliation(s)
- Nikoletta B. Báthori
- Crystal Engineering Research Unit, Department of Chemistry, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africa
- Crystal Engineering Research Unit, Department of Chemistry, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africa
| | - Ayesha Jacobs
- Crystal Engineering Research Unit, Department of Chemistry, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africa
- Crystal Engineering Research Unit, Department of Chemistry, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africa
| | - Mawonga Mei
- Crystal Engineering Research Unit, Department of Chemistry, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africa
- Crystal Engineering Research Unit, Department of Chemistry, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africa
| | - Luigi R. Nassimbeni
- Crystal Engineering Research Unit, Department of Chemistry, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africa
- Crystal Engineering Research Unit, Department of Chemistry, Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africa
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7
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Kodama S, Aizawa SI, Taga A, Yamamoto A, Honda Y, Suzuki K, Kemmei T, Hayakawa K. Determination of α-hydroxy acids and their enantiomers in fruit juices by ligand exchange CE with a dual central metal ion system. Electrophoresis 2013; 34:1327-33. [DOI: 10.1002/elps.201200645] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 01/10/2013] [Accepted: 01/11/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Shuji Kodama
- Toyama Institute of Health; Nakataikoyama, Imizu; Toyama; Japan
| | - Sen-ichi Aizawa
- Graduate School of Science and Engineering; University of Toyama; Gofuku; Toyama; Japan
| | - Atsushi Taga
- Faculty of Pharmacy, Kinki University; Higashi-Osaka; Japan
| | - Atsushi Yamamoto
- Department of Biological Chemistry; College of Bioscience and Biotechnology; Chubu University; Kasugai-shi; Aichi; Japan
| | - Yoshitaka Honda
- GL Sciences Inc., Fukushima Factory; Okajima; Fukushima; Japan
| | - Kentaro Suzuki
- GL Sciences Inc., Fukushima Factory; Okajima; Fukushima; Japan
| | - Tomoko Kemmei
- Toyama Institute of Health; Nakataikoyama, Imizu; Toyama; Japan
| | - Kazuichi Hayakawa
- Institute of Medical, Pharmaceutical and Health Sciences; Kanazawa University; Kakuma-machi; Kanazawa; Japan
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8
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Zhang H, Qi L, Mao L, Chen Y. Chiral separation using capillary electromigration techniques based on ligand exchange principle. J Sep Sci 2012; 35:1236-48. [PMID: 22733505 DOI: 10.1002/jssc.201200067] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Over the last couple of decades, researchers have developed diverse chiral separation methods emerged from a few chiral separation principles. This review article is primarily focused on the application of chiral ligand-exchange (CLE) principle in capillary electromigration techniques, such as capillary electrophoresis (CE) and capillary electrochromatography (CEC). First, the most commonly used CLE-CZE separation mode by using different kinds of central ions, such as Cu(II), Zn(II), borate ion, and other metal ions, has been introduced. Meanwhile, several kinds of surfactants have been applied as the micelle-forming agents in the CLE micellar electrokinetic chromatography mode. The highlight of recent research of CLE-CEC is the exploitation of novel columns for chiral separation. Then, two kinds of capillary columns, packed capillary and monolithic capillary column, have been briefly described. Finally, the effective application of these chiral separation methods has been presented, including the application in life science and food analysis area.
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Affiliation(s)
- Haizhi Zhang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
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9
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Kodama S, Yamamoto A, Aizawa SI, Honda Y, Suzuki K, Kemmei T, Taga A. Enantioseparation of α-hydroxy acids by chiral ligand exchange CE with a dual central metal ion system. Electrophoresis 2012; 33:2920-4. [PMID: 22930546 DOI: 10.1002/elps.201200210] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 05/26/2012] [Accepted: 06/18/2012] [Indexed: 11/09/2022]
Abstract
Using two kinds of central metal ions in a background electrolyte, ligand exchange CE was investigated for the simultaneous enantioseparation of dl-malic, dl-tartaric, and dl-isocitric acids. Ligand exchange CE with 100 mM d-quinic acid as a chiral selector ligand and 10 mM Cu(II) ion as a central metal ion could enantioseparate dl-tartaric acid but not dl-malic acid or dl-isocitric acid. A dual central metal ion system containing 0.5 mM Al(III) ion in addition to 10 mM Cu(II) ion in the background electrolyte enabled the simultaneous enantioseparation of the three α-hydroxy acids. These results suggest that the use of a dual central metal ion system can be useful for enantioseparation by ligand exchange CE.
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Affiliation(s)
- Shuji Kodama
- Toyama Institute of Health, Imizu, Toyama, Japan
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10
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Schmid MG. Chiral metal-ion complexes for enantioseparation by capillary electrophoresis and capillary electrochromatography: a selective review. J Chromatogr A 2012; 1267:10-6. [PMID: 22897866 DOI: 10.1016/j.chroma.2012.07.088] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Revised: 07/20/2012] [Accepted: 07/23/2012] [Indexed: 11/30/2022]
Abstract
This review gives an overview about chiral separation by capillary electrophoresis and capillary electrochromatography using different chiral metal-ion complexes. The topic enantioseparation is still of big interest for chiral drugs and natural compounds. Regarding chiral drugs it is often the case that the enantiomers differ in activity. The chiral separation principle of ligand-exchange (LE) can be enabled for liquid chromatography, capillary electrophoresis as well as for capillary electrochromatography. Ligand-exchange can be applied particularly for chiral amino acids, amino alcohols or α-hydroxy acids. Examples and applications are given along with the latest developments.
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Affiliation(s)
- M G Schmid
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Chemistry, Karl-Franzens-University, Graz, Austria.
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11
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The study of solution equilibria in chiral capillary electrophoresis by the ligand-exchange mechanism. Trends Analyt Chem 2012. [DOI: 10.1016/j.trac.2011.09.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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12
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Zhang H, Qi L, Qiao J, Mao L. Determination of sodium benzoate by chiral ligand exchange CE based on its inhibitory activity in d-amino acid oxidase mediated oxidation of d-serine. Anal Chim Acta 2011; 691:103-9. [DOI: 10.1016/j.aca.2011.02.039] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2010] [Revised: 01/20/2011] [Accepted: 02/16/2011] [Indexed: 10/18/2022]
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13
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Lin WC, Tseng YP, Lin CY, Yen YP. Synthesis of alanine-based colorimetric sensors and enantioselective recognition of aspartate and malate anions. Org Biomol Chem 2011; 9:5547-53. [DOI: 10.1039/c1ob05135k] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Kodama S, Taga A, Yamamoto A, Ito Y, Honda Y, Suzuki K, Yamashita T, Kemmei T, Aizawa SI. Enantioseparation of DL-isocitric acid by a chiral ligand exchange CE with Ni(II)-D-quinic acid system. Electrophoresis 2010; 31:3586-91. [DOI: 10.1002/elps.201000320] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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15
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Qi L, Yang G. Enantioseparation of dansyl amino acids by ligand-exchange capillary electrophoresis with zinc(II)-L
-phenylalaninamide complex. J Sep Sci 2009; 32:3209-14. [DOI: 10.1002/jssc.200900328] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Qi L, Qiao J, Yang G, Chen Y. Chiral ligand-exchange CE assays for separation of amino acid enantiomers and determination of enzyme kinetic constant. Electrophoresis 2009; 30:2266-72. [DOI: 10.1002/elps.200800623] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Wijeratne AB, Schug KA. Molecular recognition properties of tartrates and metal-tartrates in solution and gas phase. J Sep Sci 2009; 32:1537-47. [DOI: 10.1002/jssc.200900064] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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Zhang G, Qian C, Xu Y, Feng X, Du W, Liu BF. Open tubular CEC in a microfluidic chip for rapid chiral recognition. J Sep Sci 2009; 32:374-80. [DOI: 10.1002/jssc.200800507] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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19
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Qi L, Chen Y, Xie M, Guo Z, Wang X. Separation of dansylated amino acid enantiomers by chiral ligand-exchange CE with a zinc(II) L-arginine complex as the selecting system. Electrophoresis 2008; 29:4277-83. [DOI: 10.1002/elps.200800064] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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20
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Hödl H, Schmid MG, Gübitz G. Chiral separation of amino acids and glycyl dipeptides by chiral ligand-exchange capillary electrophoresis comparing Cu(II), Co(II), Ni(II) and Zn(II) complexes of three different sugar acids. J Chromatogr A 2008; 1204:210-8. [PMID: 18571185 DOI: 10.1016/j.chroma.2008.05.071] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2007] [Revised: 05/21/2008] [Accepted: 05/23/2008] [Indexed: 10/22/2022]
Abstract
This paper deals with comparative studies on the use of copper(II), cobalt(II), nickel(II) and zinc(II) complexes of d-gluconic acid, d-saccharic acid and l-threonic acid as chiral selectors for the enantioseparation of aromatic amino acids and glycyl dipeptides using the principle of ligand-exchange capillary electrophoresis. Although copper(II) is the most frequently used central ion in ligand-exchange capillary electrophoresis, in the case of d-gluconic acid cobalt(II) was shown to be an alternative for the enantioseparation of amino acids. Glycyl dipeptides, however, were resolved only with copper(II) complexes. Zn(II) as a central ion was not effective in all cases and with Ni(II) only some partial separations were achieved.
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Affiliation(s)
- Heike Hödl
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Chemistry, Karl-Franzens-University, Universitätsplatz 1, A-8010 Graz, Austria
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21
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Qi L, Liu M, Guo Z, Xie M, Qiu C, Chen Y. Assay of aromatic amino acid enantiomers in rice-brewed suspensions by chiral ligand-exchange CE. Electrophoresis 2007; 28:4150-5. [DOI: 10.1002/elps.200700281] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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22
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Hödl H, Krainer A, Holzmüller K, Koidl J, Schmid MG, Gübitz G. Chiral separation of sympathomimetics and β-blockers by ligand-exchange CE using Cu(II) complexes ofL-tartaric acid andL-threonine as chiral selectors. Electrophoresis 2007; 28:2675-82. [PMID: 17597468 DOI: 10.1002/elps.200600825] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This paper deals with the use of Cu(II) complexes of L-tartaric acid or L-threonine as selectors for the chiral separation of drugs containing amino alcohol structure by ligand-exchange CE. Using Cu(II) ions as a complexing agent, a series of sympathomimetics and beta-blockers were resolved. It was found that the resolution strongly depends on selector concentration and pH. The optimum pH for complexation was 12.
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Affiliation(s)
- Heike Hödl
- Department of Pharmaceutical Chemistry, Institute of Pharmaceutical Sciences, Karl-Franzens-University, Graz, Austria
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23
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Qing GY, He YB, Chen ZH, Wu XJ, Meng LZ. Sensitive fluorescent sensors for malate based on calix[4]arene bearing anthracene. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.11.043] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Koidl J, Hödl H, Schmid MG, Pantcheva S, Pajpanova T, Gübitz G. Chiral separation of halogenated amino acids by ligand-exchange capillary electrophoresis. Electrophoresis 2005; 26:3878-83. [PMID: 16217828 DOI: 10.1002/elps.200500130] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The chiral separation of halogenated amino acids by ligand-exchange CE is described. Halogenated amino acids attracted increasing interest in recent years because of their physiological activities. Different chiral selectors, as there are L-4-hydroxyproline, L-histidine, and N-alkyl derivatives of L-4-hydroxyproline in form of their copper(II) complexes, are compared for their chiral recognition ability for halogenated amino acids. The influence of various parameters, such as selector concentration, pH, organic modifier, and field strength, on the resolution was investigated. All halogenated amino acids investigated were baseline-separated under optimized conditions.
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Affiliation(s)
- Julia Koidl
- Department of Pharmaceutical Chemistry, Institute of Pharmaceutical Sciences, Karl-Franzens-University, Graz, Austria
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25
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Castañeda G, Rodríguez-Flores J, Ríos A. Analytical approaches to expanding the use of capillary electrophoresis in routine food analysis. J Sep Sci 2005; 28:915-24. [PMID: 16013817 DOI: 10.1002/jssc.200500036] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Capillary Electrophoresis (CE) is becoming an ever more powerful analytical technique for the separation, identification, and quantification of a wide variety of compounds of interest in many application fields. Particularly in food analysis this technique can offer interesting advantages over chromatographic techniques because of its greater simplicity and efficiency. Nevertheless, CE needs to advance with regard to compatibility with sample matrices, sensitivity, and robustness of the methodologies in order to gain even wider acceptance in food analysis laboratories, specially for routine work. This article presents various approaches to expanding the analytical usefulness of CE in food analysis, discussing their advantages over conventional CE. These approaches focus on sample screening, automated sample preparation with on-line CE arrangements, and the automatic integration of calibration in routine analytical work with CE.
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Affiliation(s)
- Gregorio Castañeda
- Department of Analytical Chemistry and Food Technology, Faculty of Chemistry, University of Castilla--La Mancha, Avda. Camilo José Cela, 10, E-13004 Ciudad Real, Spain
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26
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Gübitz G, Schmid MG. Recent advances in chiral separation principles in capillary electrophoresis and capillary electrochromatography. Electrophoresis 2005; 25:3981-96. [PMID: 15597419 DOI: 10.1002/elps.200406173] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This review summarizes recent developments in chiral separation in capillary zone electrophoresis (CZE), electrokinetic chromatography (EKC), and capillary electrochromatography (CEC) covering literature published since the year 2000. New chiral selectors and innovative approaches for CE and CEC are introduced. Recent progress in column technology for CEC is highlighted and the development of new chiral stationary phases is discussed. This review is not dedicated to list applications but will focus on new developments.
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Affiliation(s)
- Gerald Gübitz
- Institute of Pharmaceutical Sciences, Dept. of Pharm. Chemistry, Karl-Franzens-University, Graz, Austria.
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27
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Zheng ZX, Wei Y, Lin JM. Chiral separation based on ligand-exchange capillary electrophoresis using a copper(II)-L-ornithine ternary complex as selector. Electrophoresis 2005; 26:1007-1012. [PMID: 15714579 DOI: 10.1002/elps.200406133] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A ligand-exchange capillary electrophoresis was explored, with L-ornithine as the ligand and copper(II) as the central ion. Its applicability was demonstrated with underivatized and dansyl amino acids, a dipeptide, and drugs with amino alcohol structure. The enantioselectivity was found to be strongly dependent on pH and copper(II)-L-Orn complex concentration. Due to the adsorption of the positively charged species onto the capillary inner walls, the chiral separation selectivity is very high while the efficiency is relatively low. Permanent 1,3-propanediamine-coated capillaries show an improved separation efficiency and theoretical plate numbers increasing from 10(4) to 10(5). Similar phenomena were observed when sodium dodecyl sulfate (SDS) micelles were added to the copper(II) complex solution. The poor separation efficiency of chiral compounds in uncoated capillaries may result from the low rate of the ligand-exchange reactions, and the high enantioselectivity may derive from the complexing process in the adsorbed phase.
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Affiliation(s)
- Zhi-Xia Zheng
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
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28
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Lin Z, Wu M, Wolfbeis OS. Time-resolved fluorescent chirality sensing and imaging of malate in aqueous solution. Chirality 2005; 17:464-9. [PMID: 16104025 DOI: 10.1002/chir.20185] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Chiral discrimination of malates in aqueous solutions at near-neutral pH is achieved through fluorescence measurement and imaging using the europium-tetracycline complex (EuTc) as a fluorescent probe. The method is based on the significantly different fluorescence properties of the ternary complexes (Eu-Tc-malate) formed between EuTc and the enantiomeric malates. The enantiomeric excess (ee) of chiral malates can be quantified by both steady-state and time-resolved fluorescence, using either a conventional fluorescence microplate reader or fluorescence imaging. It offers a facile and sensitive method for high-throughput chiral discrimination.
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Affiliation(s)
- Zhihong Lin
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Regensburg, Germany
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29
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Blanco M, Valverde I. Choice of chiral selector for enantioseparation by capillary electrophoresis. Trends Analyt Chem 2003. [DOI: 10.1016/s0165-9936(03)00705-2] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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30
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Abstract
As a follow-up to a series of review articles on enantioselective ligand exchange chromatography, the present contribution critically evaluates achievements in this area of active and successful research which have been reported in the scientific since 1992. Also discussed is enantioselective ligand exchange in electromigration techniques which have developed especially fruitfully during the last decade.
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Affiliation(s)
- Vadim A Davankov
- Institute of Organo-Element Compounds, Russian Academy of Sciences, Vavilov Str. 28, Moscow 119991, Russia.
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31
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32
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Kodama S, Yamamoto A, Matsunaga A, Hayakawa K. Direct chiral resolution of tartaric acid in food products by ligand exchange capillary electrophoresis using copper(II)-D-quinic acid as a chiral selector. J Chromatogr A 2001; 932:139-43. [PMID: 11695859 DOI: 10.1016/s0021-9673(01)01228-6] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Chiral resolution of native DL-tartaric acid was performed by ligand-exchange capillary electrophoresis using copper(II)-D-quinic acid as a chiral selector. Factors affecting chiral resolution, migration time, and peak area of tartaric acid were studied. The running conditions for optimum separation of tartaric acid were found to be 1 mM copper(II) sulfate-10 mM D-quinic acid (pH 5.0) with an effective voltage of -15 kV at 30 degrees C, using direct detection at 250 nm, and resolution of racemic tartaric acid was approximately 1.3. With this system, chiral resolution of DL-tartaric acid in food products was conducted successfully.
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Affiliation(s)
- S Kodama
- Toyama Institute of Health, Kosugi-machi, Japan.
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