1
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Štěpánová S, Andris E, Gutten O, Buděšínský M, Dejmek M, Břehová P, Rulíšek L, Kašička V. Acidity constants and protonation sites of cyclic dinucleotides determined by capillary electrophoresis, quantum chemical calculations, and NMR spectroscopy. Electrophoresis 2024; 45:687-705. [PMID: 38059733 DOI: 10.1002/elps.202300232] [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: 10/14/2023] [Revised: 11/11/2023] [Accepted: 11/18/2023] [Indexed: 12/08/2023]
Abstract
Cyclic dinucleotides (CDNs) are important second messengers in bacteria and eukaryotes. Detailed characterization of their physicochemical properties is a prerequisite for understanding their biological functions. Herein, we examine acid-base and electromigration properties of selected CDNs employing capillary electrophoresis (CE), density functional theory (DFT), and nuclear magnetic resonance (NMR) spectroscopy to provide benchmark pKa values, as well as to unambiguously determine the protonation sites. Acidity constants (pKa) of the NH+ moieties of adenine and guanine bases and actual and limiting ionic mobilities of CDNs were determined by nonlinear regression analysis of the pH dependence of their effective electrophoretic mobilities measured by CE in aqueous background electrolytes in a wide pH range (0.98-11.48), at constant temperature (25°C), and constant ionic strength (25 mM). The thermodynamic pKa values were found to be in the range 3.31-4.56 for adenine and 2.28-3.61 for guanine bases, whereas the pKa of enol group of guanine base was in the range 10.21-10.40. Except for systematic shifts of ∼2 pKa, the pKa values calculated by the DFT-D3//COSMO-RS composite protocol that included large-scale conformational sampling and "cross-morphing" were in a relatively good agreement with the pKas determined by CE and predict N1 atom of adenine and N7 atom of guanine as the protonation sites. The protonation of the N1 atom of adenine and N7 atom of guanine in acidic background electrolytes (BGEs) and the dissociation of the enol group of guanine in alkaline BGEs was confirmed also by NMR spectroscopy.
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Affiliation(s)
- Sille Štěpánová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Erik Andris
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Ondrej Gutten
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Miloš Buděšínský
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Milan Dejmek
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Petra Břehová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Lubomír Rulíšek
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Václav Kašička
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
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2
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Hajduk A, Ulrich N. Determination of acidity constants of pyridines, imidazoles, and oximes by capillary electrophoresis. Electrophoresis 2023; 44:1353-1360. [PMID: 37377077 DOI: 10.1002/elps.202300037] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 06/11/2023] [Accepted: 06/12/2023] [Indexed: 06/29/2023]
Abstract
The acidity constant in the form of pKa is one of the most important physicochemical quantities. There are prediction tools available for calculating the pKa , but they only deliver precise calculated values for a relatively small set of chemicals. For complex structures with multiple functional groups in particular, the error in the predicted pKa is high due to the application domain of the corresponding models. Thus, we aim to enlarge the dataset of experimentally determined pKa values using capillary electrophoresis. We, therefore, selected various pyridines, imidazoles, and oximes to determine the pKa values using the internal standard approach and the classical method. Especially oximes were not investigated in the past, and predictions for them include larger errors. Thus, our experimentally determined values could contribute to an improved understanding of various functional groups impacting the pKa values and serve as additional datasets to develop improved pKa prediction tools.
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Affiliation(s)
- Anna Hajduk
- Department of Ecological Chemistry, Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany
| | - Nadin Ulrich
- Department of Ecological Chemistry, Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany
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3
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Ziyatdinova G, Antonova T, Davletshin R. Voltammetric Sensor Based on the Poly( p-aminobenzoic Acid) for the Simultaneous Quantification of Aromatic Aldehydes as Markers of Cognac and Brandy Quality. SENSORS (BASEL, SWITZERLAND) 2023; 23:2348. [PMID: 36850946 PMCID: PMC9960838 DOI: 10.3390/s23042348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 02/15/2023] [Accepted: 02/16/2023] [Indexed: 06/18/2023]
Abstract
Cognac and brandy quality control is an actual topic in food analysis. Aromatic aldehydes, particularly syringaldehyde and vanillin, are one of the markers used for these purposes. Therefore, simple and express methods for their simultaneous determination are required. The voltammetric sensor based on the layer-by-layer combination of multi-walled carbon nanotubes (MWCNTs) and electropolymerized p-aminobenzoic acid (p-ABA) provides full resolution of the syringaldehyde and vanillin oxidation peaks. Optimized conditions of p-ABA electropolymerization (100 µM monomer in Britton-Robinson buffer pH 2.0, twenty cycles in the polarization window of -0.5 to 2.0 V with a potential scan rate of 100 mV·s-1) were found. The poly(p-ABA)-based electrode was characterized by scanning electron microscopy (SEM), cyclic voltammetry, and electrochemical impedance spectroscopy (EIS). Electrooxidation of syringaldehyde and vanillin is an irreversible two-electron diffusion-controlled process. In the differential pulse mode, the sensor allows quantification of aromatic aldehydes in the ranges of 0.075-7.5 and 7.5-100 µM for syringaldehyde and 0.50-7.5 and 7.5-100 µM for vanillin with the detection limits of 0.018 and 0.19 µM, respectively. The sensor was applied to cognac and brandy samples and compared to chromatography.
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Affiliation(s)
- Guzel Ziyatdinova
- Analytical Chemistry Department, Kazan Federal University, Kremleyevskaya 18, Kazan 420008, Russia
| | - Tatyana Antonova
- Analytical Chemistry Department, Kazan Federal University, Kremleyevskaya 18, Kazan 420008, Russia
| | - Rustam Davletshin
- Department of High Molecular and Organoelement Compounds, Kazan Federal University, Kremleyevskaya 18, Kazan 420008, Russia
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4
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Suitability of skin-PAMPA and chromatographic systems to emulate skin permeation. Influence of pH on skin-PAMPA permeability. Microchem J 2023. [DOI: 10.1016/j.microc.2023.108567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
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5
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Fuguet E, Ràfols C, Mañé M, Ruiz R, Bosch E. Acidity constants of hydroxyl groups placed in several flavonoids: Two flavanones, two flavones and five flavonols. Talanta 2022. [DOI: 10.1016/j.talanta.2022.124096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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6
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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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7
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Albishri A, Cabot JM, Fuguet E, Rosés M. Determination of the aqueous pK a of very insoluble drugs by capillary electrophoresis: Internal standards for methanol-water extrapolation. J Chromatogr A 2021; 1665:462795. [PMID: 35042141 DOI: 10.1016/j.chroma.2021.462795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/28/2021] [Accepted: 12/29/2021] [Indexed: 10/19/2022]
Abstract
A fast determination of acidity constants (pKa) of very insoluble drugs has become a necessity in drug discovery process because it often produces molecules that are highly lipophilic and sparingly soluble in water. In this work the high throughput internal standard capillary electrophoresis (IS-CE) method has been adapted to the determination of pKa of water insoluble compounds by measurement in methanol/aqueous buffer mixtures. For this purpose, the reference pKa values for a set of 46 acid-base compounds of varied structure (internal standards) have been established in methanol-water mixtures at several solvent composition levels (with a maximum of 40% methanol). The IS-CE method has been successfully applied to seven test drugs of different chemical nature with intrinsic solubilities lower than 10-6 M. pKa values have been determined at different methanol/aqueous buffer compositions and afterwards Yasuda-Shedlovsky extrapolation method has been applied to obtain the aqueous pKa. The obtained results have successfully been compared to literature ones obtained by other methods. It is concluded that the IS-CE method allows the determination of aqueous pKa values using low proportions of methanol, becoming then more accurate in the extrapolation procedure than other reference methods.
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Affiliation(s)
- Abdulkarim Albishri
- Departament de Química Analítica and Institut de Biomedicina (IBUB), Universitat de Barcelona, Martí i Franquès 1-11 E, Barcelona 08028, Spain
| | - Joan M Cabot
- Leitat Technology Center, Innovació 2, Barcelona 08225, Spain.
| | - Elisabet Fuguet
- Departament de Química Analítica and Institut de Biomedicina (IBUB), Universitat de Barcelona, Martí i Franquès 1-11 E, Barcelona 08028, Spain; Serra Húnter Programm, Generalitat de Catalunya, Barcelona, Spain
| | - Martí Rosés
- Departament de Química Analítica and Institut de Biomedicina (IBUB), Universitat de Barcelona, Martí i Franquès 1-11 E, Barcelona 08028, Spain.
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Šolínová V, Brynda J, Šícha V, Holub J, Grűner B, Kašička V. Determination of acidity constants, ionic mobilities, and hydrodynamic radii of carborane-based inhibitors of carbonic anhydrases by capillary electrophoresis. Electrophoresis 2021; 42:910-919. [PMID: 33405254 DOI: 10.1002/elps.202000298] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 12/08/2020] [Accepted: 12/31/2020] [Indexed: 12/17/2022]
Abstract
Capillary electrophoresis (CE) has been applied for determination of the thermodynamic acidity constants (pKa ) of the sulfamidoalkyl and sulfonamidoalkyl groups, the actual and limiting ionic mobilities and hydrodynamic radii of important compounds, eight carborane-based inhibitors of carbonic anhydrases, which are potential new anticancer drugs. Two types of carboranes were investigated, (i) icosahedral cobalt bis(dicarbollide)(1-) ion with sulfamidoalkyl moieties, and (ii) 7,8-nido-dicarbaundecaborate with sulfonamidoalkyl side chains. First, the mixed acidity constants, pKa mix , of the sulfamidoalkyl and sulfonamidoalkyl groups of the above carboranes and their actual ionic mobilities were determined by nonlinear regression analysis of the pH dependences of their effective electrophoretic mobility measured by capillary electrophoresis in the pH range 8.00-12.25, at constant ionic strength (25 mM), and constant temperature (25°C). Second, the pKa mix were recalculated to the thermodynamic pKa s using the Debye-Hückel theory. The sulfamidoalkyl and sulfonamidoalkyl groups were found to be very weakly acidic with the pKa s in the range 10.78-11.45 depending on the type of carborane cluster and on the position and length of the alkyl chain on the carborane scaffold. These pKa s were in a good agreement with the pKa s (10.67-11.27) obtained by new program AnglerFish (freeware at https://echmet.natur.cuni.cz), which provides thermodynamic pKa s and limiting ionic mobilities directly from the raw CE data. The absolute values of the limiting ionic mobilities of univalent and divalent carborane anions were in the range 18.3-27.8 TU (Tiselius unit, 1 × 10-9 m2 /Vs), and 36.4-45.9 TU, respectively. The Stokes hydrodynamic radii of univalent and divalent carborane anions varied in the range 0.34-0.52 and 0.42-0.52 nm, respectively.
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Affiliation(s)
- Veronika Šolínová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague 6, Czechia
| | - Jiří Brynda
- Institute of Molecular Genetics of the Czech Academy of Sciences, Prague 4, Czechia
| | - Václav Šícha
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, Czechia
| | - Josef Holub
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, Czechia
| | - Bohumír Grűner
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, Czechia
| | - Václav Kašička
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague 6, Czechia
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9
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Lebanov L, Fuguet E, Melo JM, Rosés M. Determination of acidity constants at 37 °C through the internal standard capillary electrophoresis (IS-CE) method: internal standards and application to polyprotic drugs. Analyst 2020; 145:5897-5904. [PMID: 32671360 DOI: 10.1039/d0an00918k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
This work provides the pKa at the biorelevant temperature of 37 °C for a set of compounds proposed as internal standards for the internal standard capillary electrophoresis (IS-CE) method. This is a high throughput method that allows the determination of the acidity constants of compounds in a short time, avoiding the exact measurement of the pH of the buffers used. pH electrode calibration at 37 °C can be avoided too. In order to anchor the pKa values obtained through the IS-CE method in the pH scale, the acidity constant at 37 °C of some of the standards has been determined also by the reference potentiometric method. In general, a decrease in the pKa value is observed when changing the temperature from 25 to 37 °C, and the magnitude of the change depends on the nature of the compounds. Once the pKa values at 37 °C of the internal standards have been established, the method is applied to the determination of the acidity constants of seven polyprotic (5 diprotic and 2 triprotic) drugs. The obtained mobility-pH profiles show well-defined curves, and the fits provide precise pKa values. Due to the lack of reference data at 37 °C only the pKa values of labetalol can be compared to values from the literature, and a very good agreement is observed.
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Affiliation(s)
- Leo Lebanov
- Departament d'Enginyeria Química i Química Analítica and Institut de Biomedicina (IBUB), Universitat de Barcelona, Martí I Franquès 1-11, 08028, Barcelona, Spain.
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10
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Field T, Peterson J, Ma C, Jagadesan P, Da Silva JP, Rubina M, Ramamurthy V, Givens RS. Competing pathways for photoremovable protecting groups: the effects of solvent, oxygen and encapsulation. Photochem Photobiol Sci 2020; 19:1364-1372. [DOI: 10.1039/d0pp00067a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photolysis of p-hydroxyphenacyloxy arenes releases free phenols in good yields governed by their pKa. At high pKa, new byproducts (Bvs. A) reveal a change in reaction mechanism.
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Affiliation(s)
- Thomas Field
- Department of Chemistry
- University of Kansas
- Lawrence
- USA
| | | | - Chicheng Ma
- Department of Chemistry
- University of Kansas
- Lawrence
- USA
| | | | - José P. Da Silva
- CCMAR - Centre of Marine Sciences
- University of Algarve
- Campus de Gambelas
- Portugal
| | - Marina Rubina
- Department of Chemistry
- University of Kansas
- Lawrence
- USA
| | - V. Ramamurthy
- Department of Chemistry
- University of Miami
- Coral Gables
- USA
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11
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Determining molecular properties with differential mobility spectrometry and machine learning. Nat Commun 2018; 9:5096. [PMID: 30504922 PMCID: PMC6269546 DOI: 10.1038/s41467-018-07616-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 11/06/2018] [Indexed: 01/30/2023] Open
Abstract
The fast and accurate determination of molecular properties is highly desirable for many facets of chemical research, particularly in drug discovery where pre-clinical assays play an important role in paring down large sets of drug candidates. Here, we present the use of supervised machine learning to treat differential mobility spectrometry - mass spectrometry data for ten topological classes of drug candidates. We demonstrate that the gas-phase clustering behavior probed in our experiments can be used to predict the candidates' condensed phase molecular properties, such as cell permeability, solubility, polar surface area, and water/octanol distribution coefficient. All of these measurements are performed in minutes and require mere nanograms of each drug examined. Moreover, by tuning gas temperature within the differential mobility spectrometer, one can fine tune the extent of ion-solvent clustering to separate subtly different molecular geometries and to discriminate molecules of very similar physicochemical properties.
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12
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A comparative application of two-way and three-way analysis to three-dimensional voltammetric dataset for the pKa determination of vanillin. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.07.047] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Dardonville C. Automated techniques in pK a determination: Low, medium and high-throughput screening methods. DRUG DISCOVERY TODAY. TECHNOLOGIES 2018; 27:49-58. [PMID: 30103863 DOI: 10.1016/j.ddtec.2018.04.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 04/03/2018] [Accepted: 04/05/2018] [Indexed: 06/08/2023]
Abstract
Drug discovery programs that generate hundreds of new molecular entities need efficient methodologies for physicochemical profiling. Several high-throughput methods for pKa screening have been developed in the last 15 years to determine this key physicochemical parameter. Separation techniques such as HPLC-MS or capillary electrophoresis are particularly well-suited due to their high throughput and capacity to deal with impure or complex samples. In addition, potentiometric and (mostly) UV-metric-based methods (plate-based and automated systems), find their place as very precise methodologies for pKa determination despite of somewhat lower throughput. Finally, pKa prediction software packages are useful estimator tools but, to date, they cannot replace experimental measurements when accurate pKa values are required.
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14
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Ayine-Tora DM, Reynisson J. The Utility of Calculated Proton Affinities in Drug Design: A DFT Study. Aust J Chem 2018. [DOI: 10.1071/ch18225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Computer-aided drug design comprises several predictive tools, which can calculate various properties of the candidates under development. Proton affinity (PA) is related to pKa (the negative log of the acid dissociation constant (Ka)) one of the fundamental physical properties of drug candidates, determining their water solubility and thus their pharmacokinetic profile. The following questions therefore emerged: to what extent are PA predictions useful in drug design, and can they be reliably used to derive pKa values? Using density functional theory (DFT), it was established that for violuric acid, with three ionisation groups, the PAs correlate well with the measured pKas (R2 = 0.990). Furthermore, an excellent correlation within the amiloride compound family was achieved (R2 = 0.922). In order to obtain correlations for larger compound collections (n = 210), division into chemical families was necessary: carboxylic acids (R2 = 0.665), phenols (R2 = 0.871), and nitrogen-containing molecules (R2 = 0.742). These linear relationships were used to predict pKa values of 90 drug molecules with known pKas. A total of 48 % of the calculated values were within 1 logarithmic unit of the experimental number, but mainstream empirically based methods easily outperform this approach. The conclusion can therefore be reached that PA values cannot be reliably used for predicting pKa values globally but are useful within chemical families and in the event where a specific tautomer of a drug needs to be identified.
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15
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Guo X, Liu Q, Hu S, Guo W, Yang Z, Zhang Y. Thermodynamic models to elucidate the enantioseparation of drugs with two stereogenic centers by micellar electrokinetic chromatography. J Chromatogr A 2017; 1512:133-142. [DOI: 10.1016/j.chroma.2017.07.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 07/06/2017] [Accepted: 07/07/2017] [Indexed: 01/22/2023]
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16
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Liu C, Le Blanc JCY, Schneider BB, Shields J, Federico JJ, Zhang H, Stroh JG, Kauffman GW, Kung DW, Ieritano C, Shepherdson E, Verbuyst M, Melo L, Hasan M, Naser D, Janiszewski JS, Hopkins WS, Campbell JL. Assessing Physicochemical Properties of Drug Molecules via Microsolvation Measurements with Differential Mobility Spectrometry. ACS CENTRAL SCIENCE 2017; 3:101-109. [PMID: 28280776 PMCID: PMC5324087 DOI: 10.1021/acscentsci.6b00297] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Indexed: 05/18/2023]
Abstract
The microsolvated state of a molecule, represented by its interactions with only a small number of solvent molecules, can play a key role in determining the observable bulk properties of the molecule. This is especially true in cases where strong local hydrogen bonding exists between the molecule and the solvent. One method that can probe the microsolvated states of charged molecules is differential mobility spectrometry (DMS), which rapidly interrogates an ion's transitions between a solvated and desolvated state in the gas phase (i.e., few solvent molecules present). However, can the results of DMS analyses of a class of molecules reveal information about the bulk physicochemical properties of those species? Our findings presented here show that DMS behaviors correlate strongly with the measured solution phase pKa and pKb values, and cell permeabilities of a set of structurally related drug molecules, even yielding high-resolution discrimination between isomeric forms of these drugs. This is due to DMS's ability to separate species based upon only subtle (yet predictable) changes in structure: the same subtle changes that can influence isomers' different bulk properties. Using 2-methylquinolin-8-ol as the core structure, we demonstrate how DMS shows promise for rapidly and sensitively probing the physicochemical properties of molecules, with particular attention paid to drug candidates at the early stage of drug development. This study serves as a foundation upon which future drug molecules of different structural classes could be examined.
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Affiliation(s)
- Chang Liu
- SCIEX, 71 Four Valley Drive, Concord, Ontario, L4K 4V8, Canada
| | | | | | - Jefry Shields
- Pfizer
Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - James J. Federico
- Pfizer
Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Hui Zhang
- Pfizer
Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Justin G. Stroh
- Pfizer
Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Gregory W. Kauffman
- Pfizer
Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Daniel W. Kung
- Pfizer
Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Christian Ieritano
- Department
of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
| | - Evan Shepherdson
- Department
of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
| | - Mitch Verbuyst
- Department
of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
| | - Luke Melo
- Department
of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
| | - Moaraj Hasan
- Department
of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
| | - Dalia Naser
- Department
of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
| | - John S. Janiszewski
- Pfizer
Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
- E-mail:
| | - W. Scott Hopkins
- Department
of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
- E-mail:
| | - J. Larry Campbell
- SCIEX, 71 Four Valley Drive, Concord, Ontario, L4K 4V8, Canada
- Department
of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
- E-mail:
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17
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Investigation of the acid-base and electromigration properties of 5‐azacytosine derivatives using capillary electrophoresis and density functional theory calculations. J Chromatogr A 2017; 1479:185-193. [DOI: 10.1016/j.chroma.2016.11.058] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 11/25/2016] [Accepted: 11/28/2016] [Indexed: 11/20/2022]
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18
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Recent advances in capillary electrophoretic migration techniques for pharmaceutical analysis (2013-2015). Electrophoresis 2016; 37:1591-608. [DOI: 10.1002/elps.201600058] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 03/04/2016] [Accepted: 03/04/2016] [Indexed: 11/07/2022]
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19
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Neaga I, Bodoki E, Hambye S, Blankert B, Oprean R. Study of nucleic acid–ligand interactions by capillary electrophoretic techniques: A review. Talanta 2016; 148:247-56. [DOI: 10.1016/j.talanta.2015.10.077] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 10/21/2015] [Accepted: 10/25/2015] [Indexed: 10/22/2022]
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20
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Ni X, Li X, Cheng JP. Equilibrium acidities of cinchona alkaloid organocatalysts bearing 6′-hydrogen bonding donors in DMSO. Org Chem Front 2016. [DOI: 10.1039/c5qo00305a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The pKa values of 18 cinchona alkaloid based organocatalysts bearing 6′-hydrogen bonding donors were determined by the overlapping indicator method in DMSO via UV spectrophotometric titrations. The pKa values are in the range of 6.76–20.24.
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Affiliation(s)
- Xiang Ni
- State Key Laboratory of Elemento-Organic Chemistry
- Department of Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Xin Li
- State Key Laboratory of Elemento-Organic Chemistry
- Department of Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Jin-Pei Cheng
- Collaborative Innovation Center of Chemical Science and Engineering
- Tianjin 300071
- China
- Center of Basic Molecular Science
- Department of Chemistry
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21
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Determination of acid dissociation constants of warfarin and hydroxywarfarins by capillary electrophoresis. J Pharm Biomed Anal 2015; 112:89-97. [DOI: 10.1016/j.jpba.2015.04.027] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 04/17/2015] [Accepted: 04/18/2015] [Indexed: 01/18/2023]
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22
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Cabot JM, Fuguet E, Rosés M, Smejkal P, Breadmore MC. Novel Instrument for Automated pK(a) Determination by Internal Standard Capillary Electrophoresis. Anal Chem 2015; 87:6165-72. [PMID: 25973766 DOI: 10.1021/acs.analchem.5b00845] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The internal standard capillary electrophoresis method (IS-CE) has been implemented in a novel sequential injection-capillary electrophoresis instrument for the high-throughput determination of acidity constants (pK(a)) regardless of aqueous solubility, number of pK(a) values, or structure. This instrument comprises a buffer creation system that automatically mixes within a few seconds four reagents for in situ creation of the separation electrolyte with a pH range of 2-13, ionic strength of 10-100 mM and organic solvent content from 0% to 40%. Combined with 1.2 kV/cm and a short effective length (15 cm to the UV detector) fast 20 s electrophoretic separations can be obtained. The low standard deviation of the replicates and the low variation compared to reference values show that this system can accurately determine acidity constants of drugs by IS-CE. A single pK(a) can be determined in 2 min and a set of 20 measurements in half an hour, allowing rapid, simple, and flexible determination of pK(a) values of pharmaceutical targets.
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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.,‡Australian Centre for Research on Separation Science, School of Chemistry, Faculty of Science, Engineering and Technology, University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia
| | - 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
| | - Petr Smejkal
- ‡Australian Centre for Research on Separation Science, School of Chemistry, Faculty of Science, Engineering and Technology, University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia
| | - Michael C Breadmore
- ‡Australian Centre for Research on Separation Science, School of Chemistry, Faculty of Science, Engineering and Technology, University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia
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23
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Nowak P, Woźniakiewicz M, Kościelniak P. Application of capillary electrophoresis in determination of acid dissociation constant values. J Chromatogr A 2014; 1377:1-12. [PMID: 25543298 DOI: 10.1016/j.chroma.2014.12.032] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 12/05/2014] [Accepted: 12/09/2014] [Indexed: 11/20/2022]
Abstract
The chemical groups undergoing protonation or deprotonation in solution are described by the acid dissociation constant value, the key parameter for physicochemical characterization of biologically- and pharmacologically-important compounds. Capillary electrophoresis (CE) proved to be suitable technique for its determination: it enables automated and accurate measurements even for minute amount of sample, does not require the information about concentration, and handle both the impure and complex samples. In this review, a number of contributions reporting on the application of CE in pKa prediction has been summarized and critically discussed. The reader will find herein the brief introduction of theory, summary of all works published in the last decade, considerations on the most important innovations and achievements, and the discussion of pKa-related issues as e.g. the role of pKa-shifts in the chiral separation mechanism or the elucidation of migration order reversals observed during CE-mediated separations.
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Affiliation(s)
- Paweł Nowak
- Jagiellonian University in Kraków, Faculty of Chemistry, Department of Analytical Chemistry, Kraków, Poland
| | - Michał Woźniakiewicz
- Jagiellonian University in Kraków, Faculty of Chemistry, Department of Analytical Chemistry, Kraków, Poland.
| | - Paweł Kościelniak
- Jagiellonian University in Kraków, Faculty of Chemistry, Department of Analytical Chemistry, Kraków, Poland
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