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Sursyakova VV, Levdansky VA, Rubaylo AI. Evaluation of the effect of background electrolyte composition and independence of parameters in determining binding constants of betulin derivatives to β- and dimethyl-β-cyclodextrins by affinity capillary electrophoresis. J Sep Sci 2022; 45:3745-3753. [PMID: 35917389 DOI: 10.1002/jssc.202200453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 07/27/2022] [Accepted: 07/30/2022] [Indexed: 11/10/2022]
Abstract
The values of the apparent binding constants for β-cyclodextrin complexes of betulin derivatives determined by mobility shift affinity capillary electrophoresis were found to be independent of the composition of the two background electrolytes used (tetraborate buffer, pH 9.18, and phosphate buffer, pH 8.00, both of them with 20 mM ionic strength). It has been found that, if there is not a constant plateau on the binding curve, then four independent parameters can be determined: binding constants (also referred to as stability, association or formation constants) and ionic mobilities of 1:1 and 1:2 complexes. However, at least 10-12 data points in the binding curve should be used to reliably estimate the parameters. For the first time, the apparent binding constants for complexes of ester betulin derivatives with dimethyl-β-cyclodextrin have been determined by mobility shift affinity capillary electrophoresis. The logarithms of the constants for 1:1 and 1:2 complexes at 25°C for betulin 3,28-diphthalate with a 95 % confidence interval are 4.98 (4.95-5.01) and 7.52 (7.26-7.68); for betulin 3,28-disulfate, the values are 4.97 (4.89-5.03) and 8.24 (6.82 - 8.52). It has been found that betulin 3,28-disuccinate forms only a 1:1 complex and the binding constant logarithm is 5.25 ± 0.02. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Viktoria V Sursyakova
- Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Akademgorodok 50/24, Krasnoyarsk, 660036, Russia
| | - Vladimir A Levdansky
- Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Akademgorodok 50/24, Krasnoyarsk, 660036, Russia
| | - Anatoly I Rubaylo
- Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Akademgorodok 50/24, Krasnoyarsk, 660036, Russia.,Siberian Federal University, Svobodny pr. 79, Krasnoyarsk, 660041, Russia
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Nytrová L, Odehnalová K, Pazourek J. Extension of the Internal Standard Method for Determination of Thermodynamic Acidity Constants of Compounds Sparingly Soluble in Water by Capillary Zone Electrophoresis. ACS OMEGA 2022; 7:1477-1482. [PMID: 35036810 PMCID: PMC8756569 DOI: 10.1021/acsomega.1c06224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 12/17/2021] [Indexed: 06/14/2023]
Abstract
The paper extends applicability of the internal standard method published in 2009 (Fuguet E. et al., J. Chromatogr. A 2009, 1216(17), 3646). Although the original capillary zone electrophoresis method was suggested to determine thermodynamic acidity constants of compounds sparingly soluble in aqueous solutions by carrying out only runs at two different pH values (i.e., without the need to perform many experiments over the appropriate pH range including the form of a low-ionized analyte), we proved that the approach also virtually overcomes any interactions of the analyte in mixed solvents, so that the experiments can be carried out in a methanol-water buffer where the solubility is much better. Applicability of the extended method is illustrated on six selected β-blockers.
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Affiliation(s)
- Lucie Nytrová
- Department
of Chemical Drugs, Faculty of Pharmacy, Masaryk University, Palackého 1946/1, CZ-612 00 Brno, Czech Republic
| | - Klára Odehnalová
- Department
of Chemical Drugs, Faculty of Pharmacy, Masaryk University, Palackého 1946/1, CZ-612 00 Brno, Czech Republic
- Department
of Experimental Phycology and Ecotoxicology, Institute of Botany of the Czech Academy of Sciences, Research Division Brno, Lidická
25/27, CZ-602 00 Brno, Czech Republic
| | - Jiří Pazourek
- Department
of Chemical Drugs, Faculty of Pharmacy, Masaryk University, Palackého 1946/1, CZ-612 00 Brno, Czech Republic
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Kos J, Kapustikova I, Clements C, Gray AI, Jampilek J. 3-Hydroxynaphthalene-2-carboxanilides and their antitrypanosomal activity. MONATSHEFTE FUR CHEMIE 2018. [DOI: 10.1007/s00706-017-2099-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Gagliardi LG, Tascon M, Castells CB. Effect of temperature on acid–base equilibria in separation techniques. A review. Anal Chim Acta 2015; 889:35-57. [DOI: 10.1016/j.aca.2015.05.053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Revised: 05/16/2015] [Accepted: 05/22/2015] [Indexed: 10/23/2022]
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Cabot JM, Fuguet E, Rosés M. Determination of acidity constants of sparingly soluble drugs in aqueous solution by the internal standard capillary electrophoresis method. Electrophoresis 2014; 35:3564-9. [DOI: 10.1002/elps.201400353] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 09/01/2014] [Accepted: 09/01/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Joan Marc Cabot
- Departament de Química Analítica and Institut de Biomedicina de la Universitat de Barcelona; Universitat de Barcelona; Barcelona Spain
| | - Elisabet Fuguet
- Departament de Química Analítica and Institut de Biomedicina de la Universitat de Barcelona; Universitat de Barcelona; Barcelona Spain
| | - Martí Rosés
- Departament de Química Analítica and Institut de Biomedicina de la Universitat de Barcelona; Universitat de Barcelona; Barcelona Spain
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Cabot JM, Fuguet E, Rosés M. Internal standard capillary electrophoresis as a high-throughput method for pKa determination in drug discovery and development. ACS COMBINATORIAL SCIENCE 2014; 16:518-25. [PMID: 25170674 DOI: 10.1021/co500059p] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel high-throughput method for determining acidity constants (pKa) by capillary electrophoresis (CE) is developed. The method, based on the use of an internal standard (IS-CE), is implemented as a routine method for accurate experimental pKa determination of drugs undergoing physicochemical measurements in drug discovery laboratories. Just two electropherograms at 2 different pH values are needed to calculate an acidity constant. Several ISs can be used in the same buffer and run to enhance precision. With 3 ISs, for example, the pKa of the test compound (TC) can be obtained in triplicate in less than 3 min of electrophoresis. It has been demonstrated that the IS-CE method eliminates some systematic errors, maintaining, or even increasing the precision of the results compared with other methods. Furthermore, pH buffer instability during electrophoretic runs is not a problem in the IS-CE method. It is also proved that after 16 h of electroseparation using the same buffer vial, pH may change by around one unit; but the pKa calculated by the IS-CE method remains constant. Thus, IS-CE is a powerful high-throughput method for pKa determination in drug discovery and development.
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Affiliation(s)
- Joan M. Cabot
- Departament de Química
Analítica and Institut de Biomedicina (IBUB), Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain
| | - Elisabet Fuguet
- Departament de Química
Analítica and Institut de Biomedicina (IBUB), Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain
| | - Martí Rosés
- Departament de Química
Analítica and Institut de Biomedicina (IBUB), Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain
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Gravador RS, Fuguet E, Ràfols C, Rosés M. Temperature variation effects on the determination of acidity constants through the internal standard-capillary electrophoresis method. Electrophoresis 2013; 34:1203-11. [DOI: 10.1002/elps.201200584] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Revised: 11/30/2012] [Accepted: 12/05/2012] [Indexed: 11/07/2022]
Affiliation(s)
- Rufielyn S. Gravador
- Departament de Química Analítica and Institut de Biomedicina de la Universitat de Barcelona; Universitat de Barcelona; Barcelona; Spain
| | - Elisabet Fuguet
- Departament de Química Analítica and Institut de Biomedicina de la Universitat de Barcelona; Universitat de Barcelona; Barcelona; Spain
| | - Clara Ràfols
- Departament de Química Analítica and Institut de Biomedicina de la Universitat de Barcelona; Universitat de Barcelona; Barcelona; Spain
| | - Martí Rosés
- Departament de Química Analítica and Institut de Biomedicina de la Universitat de Barcelona; Universitat de Barcelona; Barcelona; Spain
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Ren H, Wang L, Wang X, Liu X, Jiang S. Measurement of acid dissociation constants and ionic mobilities of 3-nitro-tyrosine and 3-chloro-tyrosine by capillary zone electrophoresis. J Pharm Biomed Anal 2013; 77:83-7. [DOI: 10.1016/j.jpba.2013.01.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 01/07/2013] [Accepted: 01/07/2013] [Indexed: 10/27/2022]
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Cabot JM, Fuguet E, Ràfols C, Rosés M. Determination of acidity constants by the capillary electrophoresis internal standard method. IV. Polyprotic compounds. J Chromatogr A 2013; 1279:108-16. [DOI: 10.1016/j.chroma.2013.01.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Revised: 12/21/2012] [Accepted: 01/03/2013] [Indexed: 11/27/2022]
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Bezerra IM, Chiavone-Filho O, Mattedi S. Solid-liquid equilibrium data of amoxicillin and hydroxyphenylglycine in aqueous media. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2013. [DOI: 10.1590/s0104-66322013000100006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Hemmateenejad B, Emami L, Sharghi H. Effects of intramolecular hydrogen bonding and solvent composition on acidity of some dihydroxy-thioxanthone derivatives in methanol–water binary solvents. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2011.09.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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12
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Fuguet E, Ràfols C, Rosés M. A fast high throughput method for the determination of acidity constants by capillary electrophoresis. 3. Basic internal standards. J Chromatogr A 2011; 1218:3928-34. [DOI: 10.1016/j.chroma.2011.04.054] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Revised: 04/18/2011] [Accepted: 04/19/2011] [Indexed: 11/28/2022]
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Fast high-throughput method for the determination of acidity constants by capillary electrophoresis. II. Acidic internal standards. J Chromatogr A 2010; 1217:8340-5. [DOI: 10.1016/j.chroma.2010.10.060] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2010] [Revised: 10/07/2010] [Accepted: 10/14/2010] [Indexed: 11/19/2022]
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Šlampová A, Křivánková L, Gebauer P, Boček P. Standard systems for measurement of pK values and ionic mobilities. J Chromatogr A 2009; 1216:3637-41. [DOI: 10.1016/j.chroma.2009.01.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2008] [Revised: 12/16/2008] [Accepted: 01/12/2009] [Indexed: 10/21/2022]
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Fuguet E, Ràfols C, Bosch E, Rosés M. Fast high-throughput method for the determination of acidity constants by capillary electrophoresis. J Chromatogr A 2009; 1216:3646-51. [DOI: 10.1016/j.chroma.2008.12.090] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2008] [Revised: 12/22/2008] [Accepted: 12/31/2008] [Indexed: 11/27/2022]
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