1
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Burk RJ, Wahab MF, Armstrong DW. Influence of theoretical and semi-empirical peak models on the efficiency calculation in chiral chromatography. Talanta 2024; 277:126308. [PMID: 38820823 DOI: 10.1016/j.talanta.2024.126308] [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: 03/29/2024] [Revised: 05/13/2024] [Accepted: 05/20/2024] [Indexed: 06/02/2024]
Abstract
Height equivalent to theoretical plate (H) equations, such as the van Deemter or Knox-Saleem equations, and other efficiency vs. linear velocity equations (u), provide kinetic insights into chromatographic separations phenomena and column performance. In enantioselective separations, the peak shape of the two enantiomers can differ significantly and are often asymmetric. The peak efficiency calculations heavily impact these efficiency-flow profiles, leading to erroneous estimations of eddy diffusion, longitudinal diffusion, and mass transfer terms. In this work, new asymmetric peak functions are employed for modeling enantiomer peaks based on the Haarhoff-Van der Linde function, its generalized variant (GHVL), once Generalized Asymmetric Gaussian (AGN), and Twice Generalized Gaussian (TGN). The new models (AGN, TGN, and GHVL) incorporate higher statistical moments besides the zeroth, first, and second moments to account for two-sided asymmetry (fronting or tailing). The fit results are compared with the traditional efficiency calculation methods endorsed by official pharmacopeia and numerical estimation of moments from the raw data. Enantiomeric separations of ibuprofen and dl-homophenylalanine were chosen as probe molecules. The results demonstrate that non-linear least squares fitted functions provide better estimations of peak efficiency data even in the presence of high noise. In particular, the generalized models consistently offered the best quality fits for various peak shapes in chiral separations. Conversely, the half-height Gaussian method greatly overpredicted skewed peak efficiencies. This investigation reveals that the commonly held assumptions of peak shape and numerical integration of raw data are highly insufficient for chiral chromatography. The impact of asymmetry on plate height should not be overlooked when accurate data from efficiency-flow rate curves is derived. We advocate for the broader adoption of these new generalized peak (AGN, TGN, GHVL) models because they provide robustness at various SNRs that account for right or left asymmetry while accurately representing peak geometry.
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Affiliation(s)
- Ryan Jacob Burk
- Department of Chemistry & Biochemistry, University of Texas at Arlington, Texas, 76019, USA
| | - M Farooq Wahab
- Department of Chemistry & Biochemistry, University of Texas at Arlington, Texas, 76019, USA.
| | - Daniel W Armstrong
- Department of Chemistry & Biochemistry, University of Texas at Arlington, Texas, 76019, USA.
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2
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Dohárszky A, Kalydi E, Völgyi G, Béni S, Fejős I. Cyclodextrin-Enabled Enantioselective Complexation Study of Cathinone Analogs. Molecules 2024; 29:876. [PMID: 38398627 PMCID: PMC10893103 DOI: 10.3390/molecules29040876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 02/11/2024] [Accepted: 02/12/2024] [Indexed: 02/25/2024] Open
Abstract
The characteristic alkaloid component of the leaves of the catnip shrub (Catha edulis) is cathinone, and its synthetic analogs form a major group of recreational drugs. Cathinone derivatives are chiral compounds. In the literature, several chiral methods using cyclodextrins (CDs) have been achieved so far for diverse sets of analogs; however, a comprehensive investigation of the stability of their CD complexes has not been performed yet. To characterize the enantioselective complex formation, a systematic experimental design was developed in which a total number of 40 neutral, positively, and negatively charged CD derivatives were screened by affinity capillary electrophoresis and compared according to their cavity size, substituent type, and location. The functional groups responsible for the favorable interactions were identified in the case of para-substituted cathinone analog mephedrone, flephedrone, and 4-methylethcathinone (4-MEC) and in the case of 3,4-methylendioxy derivative butylone and methylenedioxypyrovalerone (MDPV). The succinylated-β-CD and subetadex exhibited the highest complex stabilities among the studied drugs. The complex stoichiometry was determined using the Job's plot method, and the complex structures were further studied using ROESY NMR measurements. The results of our enantioselective complex formation study can facilitate chiral method development and may lead to evaluate potential CD-based antidotes for cathinone analogs.
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Affiliation(s)
- András Dohárszky
- Department of Pharmacognosy, Semmelweis University, Üllői út 26, H-1085 Budapest, Hungary; (A.D.); (E.K.)
| | - Eszter Kalydi
- Department of Pharmacognosy, Semmelweis University, Üllői út 26, H-1085 Budapest, Hungary; (A.D.); (E.K.)
- Department of Organic Chemistry, Semmelweis University, Hőgyes Endre utca 7, H-1092 Budapest, Hungary
| | - Gergely Völgyi
- Department of Pharmaceutical Chemistry, Semmelweis University, Hőgyes Endre utca 7, H-1092 Budapest, Hungary;
| | - Szabolcs Béni
- Department of Pharmacognosy, Semmelweis University, Üllői út 26, H-1085 Budapest, Hungary; (A.D.); (E.K.)
- Department of Analytical Chemistry, Institute of Chemistry, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
| | - Ida Fejős
- Department of Pharmacognosy, Semmelweis University, Üllői út 26, H-1085 Budapest, Hungary; (A.D.); (E.K.)
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Mlčochová H, Ratih R, Michalcová L, Wätzig H, Glatz Z, Stein M. Comparison of mobility shift affinity capillary electrophoresis and capillary electrophoresis frontal analysis for binding constant determination between human serum albumin and small drugs. Electrophoresis 2022; 43:1724-1734. [DOI: 10.1002/elps.202100320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 05/30/2022] [Accepted: 06/06/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Hana Mlčochová
- Institute of Medicinal and Pharmaceutical Chemistry TU Braunschweig Braunschweig Lower Saxony Germany
- Department of Biochemistry Faculty of Science Masaryk University Brno Czech Republic
| | - Ratih Ratih
- Institute of Medicinal and Pharmaceutical Chemistry TU Braunschweig Braunschweig Lower Saxony Germany
- Department of Pharmaceutical Chemistry Faculty of Pharmacy University of Surabaya Surabaya East Java Indonesia
| | - Lenka Michalcová
- Institute of Medicinal and Pharmaceutical Chemistry TU Braunschweig Braunschweig Lower Saxony Germany
- Department of Biochemistry Faculty of Science Masaryk University Brno Czech Republic
| | - Hermann Wätzig
- Institute of Medicinal and Pharmaceutical Chemistry TU Braunschweig Braunschweig Lower Saxony Germany
| | - Zdeněk Glatz
- Department of Biochemistry Faculty of Science Masaryk University Brno Czech Republic
| | - Matthias Stein
- Institute of Medicinal and Pharmaceutical Chemistry TU Braunschweig Braunschweig Lower Saxony Germany
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4
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Screening and Identification of Specific Aptamers for Shellfish Allergen Tropomyosin with Capillary Electrophoresis-SELEX. FOOD ANAL METHOD 2022. [DOI: 10.1007/s12161-021-02211-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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5
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Davoine C, Fillet M, Pochet L. Capillary electrophoresis as a fragment screening tool to cross-validate hits from chromogenic assay: Application to FXIIa. Talanta 2021; 226:122163. [PMID: 33676706 DOI: 10.1016/j.talanta.2021.122163] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Revised: 12/20/2020] [Accepted: 01/25/2021] [Indexed: 10/22/2022]
Abstract
In this study, a partial-filling affinity capillary electrophoresis (pf-ACE) method was developed for the cross-validation of fragment hits revealed by chromogenic factor XIIa (FXIIa) assay. Chromogenic assay produces false positives, mainly due to spectrophotometric interferences and sample purity issues. pf-ACE was selected as counter-screening technology because of its separative character and the fact that the target does not have to be attached or tagged. The effects of protein plug length, applied voltage and composition of the running buffer were examined and optimized. Detection limit in terms of dissociation constant was estimated at 400 μM. The affinity evaluation was performed close to physiological conditions (pH 7.4, ionic strength 0.13 mol L-1) in a poly (ethylene oxide)-coated capillary of 75 μm internal diameter x 33 cm length with an applied voltage of 3 kV. This method uncovered chromogenic assay's false positives due to zinc contamination. Moreover, pf-ACE supported the evaluation of compounds absorbing at 405 nm.
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Affiliation(s)
- C Davoine
- Namur Medicine & Drug Innovation Center (NAMEDIC - NARILIS), University of Namur, Rue de Bruxelles 61, 5000, Namur, Belgium; Laboratory for the Analysis of Medicines (LAM), Department of Pharmacy, CIRM, University of Liege, Place du 20 Août 7, 4000, Liège, Belgium
| | - M Fillet
- Laboratory for the Analysis of Medicines (LAM), Department of Pharmacy, CIRM, University of Liege, Place du 20 Août 7, 4000, Liège, Belgium
| | - L Pochet
- Namur Medicine & Drug Innovation Center (NAMEDIC - NARILIS), University of Namur, Rue de Bruxelles 61, 5000, Namur, Belgium.
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Sursyakova VV, Levdansky VA, Rubaylo AI. Determining binding constants for 1:1 and 1:2 inclusion complexes of ester betulin derivatives with (2-hydroxypropyl)-β-cyclodextrin by affinity capillary electrophoresis. Electrophoresis 2020; 42:700-707. [PMID: 33253428 DOI: 10.1002/elps.202000189] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 11/11/2020] [Accepted: 11/25/2020] [Indexed: 01/05/2023]
Abstract
The complexation of ester betulin derivatives with (2-hydroxypropyl)-β-cyclodextrin (HP-β-CD) was studied by mobility shift affinity CE. Electrophoretic mobility for triangular peaks was calculated using the parameter a1 of the Haarhoff-Van der Linde function instead of the peak top time. Dependences of the viscosity corrected electrophoretic mobility on HP-β-CD concentration were not described on the basis of only complexes with 1:1 stoichiometry due to the fact that these binding curves did not reach a plateau. However, the dependences were well described taking into account both 1:1 and 1:2 complexes. The presence of higher order equilibria was also revealed by x-reciprocal plots. The values of apparent binding constant logarithm, obtained for the first time, for 1:1 and 1:2 HP-β-CD complexes of betulin 3,28-diphthalate and betulin 3,28-disuccinate with 95% confidence interval limits in brackets are the same within error and are equal to 4.85 (4.73-4.95), 8.56 (7.75-8.82), 4.92 (4.86-4.97), and 8.54 (8.23-8.72) at 25°C, respectively. These values for 1:1 and 1:2 HP-β-CD complexes of betulin 3,28-disulfate at 25°C are 4.61 (4.57-4.64) and 7.11 (6.57-7.34), respectively. The binding constants for betulin 3,28-disulfate agree with the previously obtained results from the separation in the thermostatted capillary segment.
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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", Krasnoyarsk, Russia
| | - Vladimir A Levdansky
- Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia
| | - Anatoly I Rubaylo
- Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia.,School of Non-Ferrous Metals and Material Science, Siberian Federal University, Krasnoyarsk, Russia.,Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia
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7
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Wang Y, Adeoye DI, Ogunkunle EO, Wei IA, Filla RT, Roper MG. Affinity Capillary Electrophoresis: A Critical Review of the Literature from 2018 to 2020. Anal Chem 2020; 93:295-310. [DOI: 10.1021/acs.analchem.0c04526] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Yao Wang
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftain Way, Tallahassee, Florida 32306, United States
| | - Damilola I. Adeoye
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftain Way, Tallahassee, Florida 32306, United States
| | - Emmanuel O. Ogunkunle
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftain Way, Tallahassee, Florida 32306, United States
| | - I-An Wei
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftain Way, Tallahassee, Florida 32306, United States
| | - Robert T. Filla
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftain Way, Tallahassee, Florida 32306, United States
| | - Michael G. Roper
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftain Way, Tallahassee, Florida 32306, United States
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8
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Sursyakova VV, Levdansky VA, Rubaylo AI. Determination of binding constants for strong complexation by affinity capillary electrophoresis: the example of complexes of ester betulin derivatives with (2-hydroxypropyl)-γ-cyclodextrin. Anal Bioanal Chem 2020; 412:5615-5625. [DOI: 10.1007/s00216-020-02777-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 06/12/2020] [Accepted: 06/17/2020] [Indexed: 02/06/2023]
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9
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Bertaut E, Goossens JF, Landy D, Danel C. Binding constants determination of cyclodextrin inclusion complexes by affinity capillary electrophoresis. How to overcome the limitations induced by the UV-detector? J Chromatogr A 2020; 1623:461209. [DOI: 10.1016/j.chroma.2020.461209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 05/04/2020] [Accepted: 05/05/2020] [Indexed: 10/24/2022]
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10
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Generalized model of the linear theory of electromigration and its application to electrokinetic chromatography: Capillary zone electrophoretic systems with complex-forming equilibria. J Chromatogr A 2020; 1610:460595. [DOI: 10.1016/j.chroma.2019.460595] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Revised: 09/27/2019] [Accepted: 09/30/2019] [Indexed: 12/25/2022]
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11
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Sursyakova VV, Levdansky VA, Rubaylo AI. Strong complexation of water‐soluble betulin derivatives with (2‐hydroxypropyl)‐γ‐cyclodextrin studied by affinity capillary electrophoresis. Electrophoresis 2019; 41:112-115. [DOI: 10.1002/elps.201900347] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 10/25/2019] [Accepted: 10/28/2019] [Indexed: 01/04/2023]
Affiliation(s)
- Viktoria V. Sursyakova
- Institute of Chemistry and Chemical Technology SB RASFederal Research Center “Krasnoyarsk Science Center SB RAS” Krasnoyarsk Russia
| | - Vladimir A. Levdansky
- Institute of Chemistry and Chemical Technology SB RASFederal Research Center “Krasnoyarsk Science Center SB RAS” Krasnoyarsk Russia
| | - Anatoly I. Rubaylo
- Institute of Chemistry and Chemical Technology SB RASFederal Research Center “Krasnoyarsk Science Center SB RAS” Krasnoyarsk Russia
- Siberian Federal University Krasnoyarsk Russia
- Federal Research Center “Krasnoyarsk Science Center SB RAS” Krasnoyarsk Russia
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12
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Olabi M, Stein M, Wätzig H. Affinity capillary electrophoresis for studying interactions in life sciences. Methods 2018; 146:76-92. [PMID: 29753786 DOI: 10.1016/j.ymeth.2018.05.006] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 05/04/2018] [Accepted: 05/07/2018] [Indexed: 12/14/2022] Open
Abstract
Affinity capillary electrophoresis (ACE) analyzes noncovalent interactions between ligands and analytes based on changes in their electrophoretic mobility. This technique has been widely used to investigate various biomolecules, mainly proteins, polysaccharides and hormones. ACE is becoming a technique of choice to validate high throughput screening results, since it is very predictively working in realistic and relevant media, e.g. in body fluids. It is highly recommended to incorporate ACE as a powerful analytical tool to properly prepare animal testing and preclinical studies. The interacting molecules can be found free in solution or can be immobilized to a solid support. Thus, ACE is classified in two modes, free solution ACE and immobilized ACE. Every ACE mode has advantages and disadvantages. Each can be used for a variety of applications. This review covers literature of scopus and SciFinder data base in the period from 2016 until beginning 2018, including the keywords "affinity capillary electrophoresis", "immunoaffinity capillary electrophoresis", "immunoassay capillary electrophoresis" and "immunosorbent capillary electrophoresis". More than 200 articles have been found and 112 have been selected and thoroughly discussed. During this period, the data processing and the underlying calculations in mobility shift ACE (ms ACE), frontal analysis ACE (FA ACE) and plug-plug kinetic capillary electrophoresis (ppKCE) as mostly applied free solution techniques have substantially improved. The range of applications in diverse free solution and immobilized ACE techniques has been considerably broadened.
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Affiliation(s)
- Mais Olabi
- Institute of Medicinal and Pharmaceutical Chemistry, TU Braunschweig, Beethovenstr. 55, 38106 Braunschweig, Germany.
| | - Matthias Stein
- Institute of Medicinal and Pharmaceutical Chemistry, TU Braunschweig, Beethovenstr. 55, 38106 Braunschweig, Germany.
| | - Hermann Wätzig
- Institute of Medicinal and Pharmaceutical Chemistry, TU Braunschweig, Beethovenstr. 55, 38106 Braunschweig, Germany.
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13
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Ionic liquids and cyclodextrin inclusion complexes: limitation of the affinity capillary electrophoresis technique. Anal Bioanal Chem 2016; 408:8211-8220. [DOI: 10.1007/s00216-016-9931-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 08/22/2016] [Accepted: 09/07/2016] [Indexed: 11/26/2022]
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14
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Dubský P, Dvořák M, Ansorge M. Affinity capillary electrophoresis: the theory of electromigration. Anal Bioanal Chem 2016; 408:8623-8641. [DOI: 10.1007/s00216-016-9799-y] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 07/04/2016] [Accepted: 07/14/2016] [Indexed: 12/19/2022]
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15
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Influence of Analyte Concentration on Stability Constant Values Determined by Capillary Electrophoresis. J Chromatogr Sci 2016; 54:1253-62. [DOI: 10.1093/chromsci/bmw057] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Indexed: 11/14/2022]
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Abstract
The present review covers recent advances and important applications of affinity capillary electrophoresis (ACE). It provides an overview about various ACE types, including ACE-MS, the multiple injection mode, the use of microchips and field-amplified sample injection-ACE. The most common scenarios of the studied affinity interactions are protein-drug, protein-metal ion, protein-protein, protein-DNA, protein-carbohydrate, carbohydrate-drug, peptide-peptide, DNA-drug and antigen-antibody. Approaches for the improvements of ACE in term of precision, rinsing protocols and sensitivity are discussed. The combined use of computer simulation programs to support data evaluation is presented. In conclusion, the performance of ACE is compared with other techniques such as equilibrium dialysis, parallel artificial membrane permeability assay, high-performance affinity chromatography as well as surface plasmon resonance, ultraviolet, circular dichroism, nuclear magnetic resonance, Fourier transform infrared, fluorescence, MS and isothermal titration calorimetry.
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Dubský P, Dvořák M, Műllerová L, Gaš B. Determination of the correct migration time and other parameters of the Haarhoff-van der Linde function from the peak geometry characteristics. Electrophoresis 2015; 36:655-61. [DOI: 10.1002/elps.201400463] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 11/14/2014] [Accepted: 11/14/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Pavel Dubský
- Department of Physical and Macromolecular Chemistry; Faculty of Science; Charles University in Prague; Prague Czech Republic
| | - Martin Dvořák
- Department of Physical and Macromolecular Chemistry; Faculty of Science; Charles University in Prague; Prague Czech Republic
| | - Ludmila Műllerová
- Department of Physical and Macromolecular Chemistry; Faculty of Science; Charles University in Prague; Prague Czech Republic
| | - Bohuslav Gaš
- Department of Physical and Macromolecular Chemistry; Faculty of Science; Charles University in Prague; Prague Czech Republic
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Dvořák M, Svobodová J, Beneš M, Gaš B. Applicability and limitations of affinity capillary electrophoresis and vacancy affinity capillary electrophoresis methods for determination of complexation constants. Electrophoresis 2013; 34:761-7. [DOI: 10.1002/elps.201200581] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Revised: 11/29/2012] [Accepted: 11/29/2012] [Indexed: 11/11/2022]
Affiliation(s)
- Martin Dvořák
- Faculty of Science, Department of Physical and Macromolecular Chemistry; Charles University in Prague; Prague; Czech Republic
| | - Jana Svobodová
- Faculty of Science, Department of Physical and Macromolecular Chemistry; Charles University in Prague; Prague; Czech Republic
| | - Martin Beneš
- Faculty of Science, Department of Physical and Macromolecular Chemistry; Charles University in Prague; Prague; Czech Republic
| | - Bohuslav Gaš
- Faculty of Science, Department of Physical and Macromolecular Chemistry; Charles University in Prague; Prague; Czech Republic
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Ehala S, Makrlík E, Toman P, Kašička V. ACE applied to the quantitative characterization of benzo-18-crown-6-ether binding with alkali metal ions in a methanol-water solvent system. Electrophoresis 2010; 31:702-8. [DOI: 10.1002/elps.200900581] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Ahmed FE. The role of capillary electrophoresis–mass spectrometry to proteome analysis and biomarker discovery. J Chromatogr B Analyt Technol Biomed Life Sci 2009; 877:1963-81. [DOI: 10.1016/j.jchromb.2009.05.023] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2008] [Revised: 04/24/2009] [Accepted: 05/10/2009] [Indexed: 01/25/2023]
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22
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Application of capillary affinity electrophoresis and density functional theory to the investigation of valinomycin–lithium complex. J Chromatogr A 2009; 1216:3660-5. [DOI: 10.1016/j.chroma.2009.02.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2008] [Revised: 01/29/2009] [Accepted: 02/02/2009] [Indexed: 11/20/2022]
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23
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Ehala S, Kašička V, Makrlík E. Determination of stability constants of valinomycin complexes with ammonium and alkali metal ions by capillary affinity electrophoresis. Electrophoresis 2008; 29:652-7. [DOI: 10.1002/elps.200700583] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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24
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Holm R, Hartvig RA, Nicolajsen HV, Westh P, Østergaard J. Characterization of the complexation of tauro- and glyco-conjugated bile salts with γ-cyclodextrin and 2-hydroxypropyl-γ-cyclodextrin using affinity capillary electrophoresis. J INCL PHENOM MACRO 2008. [DOI: 10.1007/s10847-008-9409-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Holm R, Nicolajsen HV, Hartvig RA, Westh P, Ostergaard J. Complexation of tauro- and glyco-conjugated bile salts with three neutral β-CDs studied by ACE. Electrophoresis 2007; 28:3745-52. [PMID: 17893938 DOI: 10.1002/elps.200700311] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Complexation of the bile salts (BS) taurocholate, tauro-beta-muricholate, taurodeoxycholate, taurochenodeoxycholate, glycocholate, glycodeoxycholate, and glycochenodeoxycholate common in rat, dog, and man with natural beta-CD and the chemically modified beta-CDs 2-hydroxypropyl-beta-CD and 2-O-methyl-beta-CD was studied using mobility shift ACE. The CDs were selected due to their frequent use in preformulation and drug formulation as oral excipients for the solubilization of drug substances with low aqueous solubility. ACE was demonstrated to be a feasible and efficient technique for investigation of the interactions between BS and beta-CDs. All the investigated BS possessed affinity for the three CDs with stability constants ranging from 2x10(3) to 4x10(5) M(-) (1). The requirements and assumptions related to the use of ACE for estimating high affinity stability constants were discussed. The extent and pattern of hydroxylation significantly influenced the affinity of the glyco- and tauro-conjugated BS toward the beta-CDs (chenodeoxycholates >> deoxycholates > cholates) whereas the nature of the beta-CD derivatization and BS conjugation played a minor role only. The results indicate that displacement of drug substances from beta-CD inclusion complexes is likely to occur in the small intestine where BS are present potentially influencing drug bioavailability.
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Affiliation(s)
- René Holm
- Preformulation, H. Lundbeck A/S, Valby, Denmark
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27
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François Y, Varenne A, Sirieix-Plenet J, Gareil P. Determination of aqueous inclusion complexation constants and stoichiometry of alkyl(methyl)-methylimidazolium-based ionic liquid cations and neutral cyclodextrins by affinity capillary electrophoresis. J Sep Sci 2007; 30:751-60. [PMID: 17461117 DOI: 10.1002/jssc.200600386] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Affinity CE (ACE) method was developed to characterize the complex formation between seven alkyl(methyl)methylimidazolium-based ionic liquid (IL) cations and eight neutral cyclodextrins (CD). The effective mobility data of the IL cations were processed according to classical nonlinear and linear treatments to obtain the complex stoichiometry and formation constant K. The majority of systems followed a 1:1 complexation stoichiometry model but in four cases a 1:2 stoichiometry was better satisfied. The K values obtained for each IL were compared to elucidate the main influences of IL and CD nature. The availability of these data should lend support to various application areas, including the screening and tailoring of new interactions in the solution for CE.
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Affiliation(s)
- Yannis François
- Laboratory of Electrochemistry and Analytical Chemistry, UMR 7575 CNRS-ENSCP-Paris6, ENSCP, Paris, France
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28
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Le Saux T, Varenne A, Perreau F, Siret L, Duteil S, Duhau L, Gareil P. Determination of the binding parameters for antithrombin–heparin fragment systems by affinity and frontal analysis continuous capillary electrophoresis. J Chromatogr A 2006; 1132:289-96. [PMID: 16965780 DOI: 10.1016/j.chroma.2006.07.092] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2006] [Revised: 06/27/2006] [Accepted: 07/28/2006] [Indexed: 11/22/2022]
Abstract
The suitability of affinity capillary electrophoresis (ACE) and frontal analysis continuous capillary electrophoresis (FACCE) for binding constant determination was investigated for complexes between heparin fragments and antithrombin III, one of the main target proteins in the coagulation cascade. In a 100 mM ionic strength phosphate buffer (pH 7.4), ACE was suitable to determine weak to medium interactions developed by short oligomeric heparin fragments, but it failed for decasaccharide, which presents a more complex irreversible interaction. However FACCE allowed evaluating the binding constant for these longer oligomeric fragments. Both experimental approaches were complementary for a wide variety of heparinic fragments.
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Affiliation(s)
- T Le Saux
- Laboratoire d'Electrochimie et Chimie Analytique, UMR CNRS 7575, Ecole Nationale Supérieure de Chimie de Paris, Université ParisVI, 11, rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
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29
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Le Saux T, Hisamoto H, Terabe S. Measurement of monomolecular binding constants of neutral phenols into the beta-cyclodextrin by continuous frontal analysis in capillary and microchip electrophoresis via a competitive assay. J Chromatogr A 2005; 1104:352-8. [PMID: 16376902 DOI: 10.1016/j.chroma.2005.11.125] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2005] [Revised: 11/23/2005] [Accepted: 11/29/2005] [Indexed: 11/24/2022]
Abstract
Measurement of binding constant by chip electrophoresis is a very promising technique for the high throughput screening of non-covalent interactions. Among the different electrophoretic methods available that yield the binding parameters, continuous frontal analysis is the most appropriate for a transposition from capillary electrophoresis (CE) to microchip electrophoresis. Implementation of this methodology in microchip was exemplified by the measurement of inclusion constants of 2-naphtalenesulfonate and neutral phenols (phenol, 4-chlorophenol and 4-nitrophenol) into beta-cyclodextrin by competitive assays. The issue of competitor choice is discussed in relation to its appropriateness for proper monitoring of the interaction.
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Affiliation(s)
- Thomas Le Saux
- Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 697-1297 Japan.
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