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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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Cerón-Carrasco JP, Jacquemin D. Using Theory To Extend the Scope of Azobenzene Drugs in Chemotherapy: Novel Combinations for a Specific Delivery. ChemMedChem 2021; 16:1764-1774. [PMID: 33619857 DOI: 10.1002/cmdc.202100046] [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: 01/19/2021] [Revised: 02/18/2021] [Indexed: 12/12/2022]
Abstract
Gut microorganisms metabolize azobenzene compounds (Ph1 -N=N-Ph2 ) into free aniline products (Ph1 -NH2 +H2 N-Ph2 ), a process that has been largely investigated to reduce dyes residues in the textile industry. However, the action of bacterial core enzymes such as azoreductases (AzoR) might also help to deliver prodrugs that become active when they reach the colonic region, a mechanism with potential applications for the treatment of inflammatory bowel disease (IBD) and colorectal cancer. So far, three azo-bonded prodrugs of 5-aminosalicylic acid (5-ASA), for example, sulfasalazine, olsalazine and balsalazide, have been used for colon-targeted delivery. The present contribution describes the first rational design of a novel azobenzene prodrug thanks to a computational approach, with a focus on linking 5-ASA to another approved anti-inflammatory drug. The resulting prodrugs were assessed for their degradation upon AzoR action. Replacing the original carriers by irsogladine is found to improve action.
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Affiliation(s)
- José P Cerón-Carrasco
- Reconocimiento y Encapsulación Molecular, Universidad Católica San Antonio de Murcia (UCAM) Campus los Jerónimos, 30107, Murcia, Spain
| | - Denis Jacquemin
- CEISAM UMR CNRS 6230, Université de Nantes, 44000, Nantes, France
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Wang D, Wang Z, Li Y, Song Y, Song Y, Zhang M, Yu H. A single rhodamine spirolactam probe for localization and pH monitoring of mitochondrion/lysosome in living cells. NEW J CHEM 2018. [DOI: 10.1039/c8nj01895b] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Rh-BMDZ with neutral pKa6.9 succeeds in indicating and discriminating mitochondria and lysosomes simultaneously in MCF-7 cells.
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Affiliation(s)
- Dan Wang
- College of Environmental Sciences
- Liaoning University
- Shenyang 110036
- P. R. China
| | - Zechen Wang
- College of Environmental Sciences
- Liaoning University
- Shenyang 110036
- P. R. China
| | - Yahui Li
- College of Environmental Sciences
- Liaoning University
- Shenyang 110036
- P. R. China
| | - Yang Song
- College of Environmental Sciences
- Liaoning University
- Shenyang 110036
- P. R. China
| | - Youtao Song
- College of Environmental Sciences
- Liaoning University
- Shenyang 110036
- P. R. China
| | - Mingyan Zhang
- Liaoning Center of Disease Prevention and Control
- Shenyang 110001
- P. R. China
| | - Haibo Yu
- College of Environmental Sciences
- Liaoning University
- Shenyang 110036
- P. R. China
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Poltorak L, Sudhölter EJ, de Smet LC. Effect of charge of quaternary ammonium cations on lipophilicity and electroanalytical parameters: Task for ion transfer voltammetry. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.04.051] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Tupys A, Kalembkiewicz J, Bazel Y, Zapała L, Dranka M, Ostapiuk Y, Tymoshuk O, Woźnicka E. 1-[(5-Benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol: X-ray structure, spectroscopic characterization, dissociation studies and application in mercury(II) detection. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.07.119] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Pobudkowska A, Ràfols C, Subirats X, Bosch E, Avdeef A. Phenothiazines solution complexity – Determination of pKa and solubility-pH profiles exhibiting sub-micellar aggregation at 25 and 37°C. Eur J Pharm Sci 2016; 93:163-76. [DOI: 10.1016/j.ejps.2016.07.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 07/04/2016] [Accepted: 07/18/2016] [Indexed: 11/27/2022]
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Abstract
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Identification
of the usefulness of lipid-based formulations (LBFs)
for delivery of poorly water-soluble drugs is at date mainly experimentally
based. In this work we used a diverse drug data set, and more than
2,000 solubility measurements to develop experimental and computational
tools to predict the loading capacity of LBFs. Computational models
were developed to enable in silico prediction of
solubility, and hence drug loading capacity, in the LBFs. Drug solubility
in mixed mono-, di-, triglycerides (Maisine 35-1 and Capmul MCM EP)
correlated (R2 0.89) as well as the drug
solubility in Carbitol and other ethoxylated excipients (PEG400, R2 0.85; Polysorbate 80, R2 0.90; Cremophor EL, R2 0.93).
A melting point below 150 °C was observed to result in a reasonable
solubility in the glycerides. The loading capacity in LBFs was accurately
calculated from solubility data in single excipients (R2 0.91). In silico models, without the
demand of experimentally determined solubility, also gave good predictions
of the loading capacity in these complex formulations (R2 0.79). The framework established here gives a better
understanding of drug solubility in single excipients and of LBF loading
capacity. The large data set studied revealed that experimental screening
efforts can be rationalized by solubility measurements in key excipients
or from solid state information. For the first time it was shown that
loading capacity in complex formulations can be accurately predicted
using molecular information extracted from calculated descriptors
and thermal properties of the crystalline drug.
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Affiliation(s)
- Linda C Alskär
- Uppsala University Drug Optimization and Pharmaceutical Profiling Platform, Department of Pharmacy, Uppsala University , Uppsala Biomedical Center P.O. Box 580, SE-751 23 Uppsala, Sweden
| | - Christopher J H Porter
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University , 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Christel A S Bergström
- Uppsala University Drug Optimization and Pharmaceutical Profiling Platform, Department of Pharmacy, Uppsala University , Uppsala Biomedical Center P.O. Box 580, SE-751 23 Uppsala, Sweden.,Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University , 381 Royal Parade, Parkville, Victoria 3052, Australia
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RPLC determination of acid dissociation constants and quantitative estimation for sulfasalazine. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2015. [DOI: 10.1007/s13738-015-0717-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [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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Zapała L, Woźnicka E, Kalembkiewicz J. Tautomeric and Microscopic Protonation Equilibria of Anthranilic Acid and Its Derivatives. J SOLUTION CHEM 2014; 43:1167-1183. [PMID: 25067861 PMCID: PMC4074347 DOI: 10.1007/s10953-014-0190-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Accepted: 04/04/2014] [Indexed: 10/25/2022]
Abstract
The acid-base chemistry of three zwitterionic compounds, namely anthranilic (2-aminobenzoic acid), N-methylanthranilic and N-phenylanthranilic acid has been characterized in terms of the macroconstants Ka1, Ka2, the isoelectric point pHI, the tautomerization constant Kz and microconstants k11, k12, k21, k22. The potentiometric titration method was used to determine the macrodissociation constants. Due to the very poor water solubility of N-phenylanthranilic acid the dissociation constants pKa1 and pKa2 were determined in MDM-water mixtures [MDM is a co-solvent mixture, consisting of equal volumes of methanol (MeOH), dioxane and acetonitrile (MeCN)]. The Yasuda-Shedlovsky extrapolation procedure has been used to obtain the values of pKa1 and pKa2 in aqueous solutions. The pKa1 and pKa2 values obtained by this method are 2.86 ± 0.01 and 4.69 ± 0.03, respectively. The tautomerization constant Kz describing the equilibrium between unionized form ⇌ zwitterionic form was evaluated by the Kz method based on UV-VIS spectrometry. The method uses spectral differences between the zwitterionic form (found at isoelectric pH in aqueous solution) and the unionized form (formed in an organic solvent of low dielectric constant). The highest value of the Kz constant has been observed in the case of N-methylantranilic acid (log10Kz = 1.31 ± 0.04). The values of log10Kz for anthranilic and N-phenylanthranilic acids are similar and have values of 0.93 ± 0.03 and 0.90 ± 0.05, respectively. The results indicate that the tested compounds, in aqueous solution around the isoelectric point pHI, occur mainly in the zwitterionic form. Moreover, the influence of the type of substituent and pH of the aqueous phase on the equilibrium were analyzed with regard to the formation and the coexistence of different forms of the acids in the examined systems.
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Affiliation(s)
- Lidia Zapała
- Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, Rzeszow University of Technology, 6 Powstańców Warszawy Ave., 35-959 Rzeszow, Poland
| | - Elżbieta Woźnicka
- Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, Rzeszow University of Technology, 6 Powstańców Warszawy Ave., 35-959 Rzeszow, Poland
| | - Jan Kalembkiewicz
- Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, Rzeszow University of Technology, 6 Powstańców Warszawy Ave., 35-959 Rzeszow, Poland
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Zapała L. Potentiometric Studies on the Equilibria of Flufenamic Acid in Aqueous Solutions and in Two-phase Organic Solvent + Water Systems. J SOLUTION CHEM 2011. [DOI: 10.1007/s10953-010-9642-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Nagy PI, Völgyi G, Takács-Novák K. Monte Carlo Structure Simulations for Aqueous 1,4-Dioxane Solutions. J Phys Chem B 2008; 112:2085-94. [DOI: 10.1021/jp075603c] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peter I. Nagy
- Department of Medicinal and Biological Chemistry and the Center for Drug Design and Development, The University of Toledo, Toledo, Ohio 43606-3390, and Department of Pharmaceutical Chemistry, Semmelweis University, Högyes E. u. 9, H-1092 Budapest, Hungary
| | - Gergely Völgyi
- Department of Medicinal and Biological Chemistry and the Center for Drug Design and Development, The University of Toledo, Toledo, Ohio 43606-3390, and Department of Pharmaceutical Chemistry, Semmelweis University, Högyes E. u. 9, H-1092 Budapest, Hungary
| | - Krisztina Takács-Novák
- Department of Medicinal and Biological Chemistry and the Center for Drug Design and Development, The University of Toledo, Toledo, Ohio 43606-3390, and Department of Pharmaceutical Chemistry, Semmelweis University, Högyes E. u. 9, H-1092 Budapest, Hungary
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