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Dinç E, Ertekin ZC. Two Different Strategies Based on Three‐Way Analysis Models of UV Spectroscopic and Spectrochromatographic Measurements to Quantify the Acidity Constant of Acetylsalicylic Acid. ChemistrySelect 2022. [DOI: 10.1002/slct.202104345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Erdal Dinç
- Department of Analytical Chemistry Ankara University Faculty of Pharmacy 06560 Yenimahalle Ankara Turkey
| | - Zehra Ceren Ertekin
- Department of Analytical Chemistry Ankara University Faculty of Pharmacy 06560 Yenimahalle Ankara Turkey
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Selimoğlu F, Ünal N, Ceren Ertekin Z, Dinç E. PARAFAC and MCR-ALS approaches to the pKa determination of benzoic acid and its derivatives. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 248:119253. [PMID: 33302215 DOI: 10.1016/j.saa.2020.119253] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Revised: 11/24/2020] [Accepted: 11/26/2020] [Indexed: 06/12/2023]
Abstract
In general, the identification of biological activities of a molecule requires the observation of its physicochemical characteristics with its molecular interactions in an organism. The acid-base ionization constant (or pKa) is one of the key parameters that shows the physicochemical behaviors of molecules used in pharmaceuticals, foods, cosmetics etc. Therefore, the development of new methods (or approaches) is necessary to get simple, rapid, inexpensive and reliable determination of the acidity constants of active and inactive ingredients used in commercial products. In this paper, new UV spectroscopic methods were developed for the first time, by applying parallel factor analysis (PARAFAC) and multivariate curve resolution-alternating least squares (MCR-ALS) to the pH-UV spectral data arrays for determining the pKa values of benzoic acid and its five derivatives (4-fluorobenzoic acid, thiosalicylic acid, anthranilic acid, phthalic acid, 4-aminobenzoic acid). The pH profiles obtained by the PARAFAC and MCR-ALS decomposition of the pH-UV data arrays were used for the quantitative estimation of the acid-base ionization constants for the investigated compounds without classical titration procedure. We concluded that the proposed PARAFAC and MCR-ALS provided us an opportunity for simple and rapid pKa determination of relevant compounds, which have functional importance in pharmaceutical and food industries.
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Affiliation(s)
- Faysal Selimoğlu
- Necmettin Erbakan University, Faculty of Science, Department of Biotechnology, 42090 Meram, Konya, Turkey
| | - Nazangül Ünal
- Ankara University, Faculty of Pharmacy, Department of Analytical Chemistry, 06560 Yenimahalle, Ankara, Turkey
| | - Zehra Ceren Ertekin
- Ankara University, Faculty of Pharmacy, Department of Analytical Chemistry, 06560 Yenimahalle, Ankara, Turkey
| | - Erdal Dinç
- Ankara University, Faculty of Pharmacy, Department of Analytical Chemistry, 06560 Yenimahalle, Ankara, Turkey.
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Guo Y, Wei W, Zhang Y, Dai Y, Wang W, Wang A. Determination of sulfadimethoxine in milk with aptamer-functionalized Fe 3 O 4 /graphene oxide as magnetic solid-phase extraction adsorbent prior to HPLC. J Sep Sci 2020; 43:3499-3508. [PMID: 32573934 DOI: 10.1002/jssc.202000277] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 06/13/2020] [Accepted: 06/18/2020] [Indexed: 01/06/2023]
Abstract
An aptamer (Apt) functionalized magnetic material was prepared by covalently link Apt to Fe3 O4 /graphene oxide (Fe3 O4 /GO) composite by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride and N-hydroxysuccinimide, and then characterized by FTIR spectroscopy, X-ray diffraction, and vibration sample magnetometry. The obtained composite of Fe3 O4 /GO/Apt was employed as magnetic solid-phase extraction adsorbent for the selective preconcentration of sulfadimethoxine prior to analysis by high-performance liquid chromatography. Under the optimal conditions (sample pH of 4.0, sorbent dosage of 20 mg, extraction time of 3 h, and methanol-5% acetic acid solution as eluent), a good linear relationship was obtained between the peak area and concentration of sulfadimethoxine in the range of 5.0 to 1500.0 µg/L with correlation coefficient of 0.9997. The limit of detection (S/N = 3) was 3.3 µg/L. The developed method was successfully applied to the analysis of sulfadimethoxine in milk with recoveries in the range of 75.9-92.3% and relative standard deviations less than 8.1%. The adsorption mechanism of Fe3 O4 /GO/Apt toward sulfadimethoxine was studied through the adsorption kinetics and adsorption isotherms, and the results show that the adsorption process fits well with the pseudo-second-order kinetic model and the adsorbate on Fe3 O4 /GO/Apt is multilayer and heterogeneous.
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Affiliation(s)
- Yinan Guo
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, P. R. China
| | - Wei Wei
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, P. R. China
| | - Ying Zhang
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, P. R. China
| | - Yuanyuan Dai
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, P. R. China
| | - Weiping Wang
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, P. R. China
| | - Aijun Wang
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, P. R. China
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A computational UV–Vis spectroscopic study of the chemical speciation of 2-mercaptobenzothiazole corrosion inhibitor in aqueous solution. Theor Chem Acc 2016. [DOI: 10.1007/s00214-016-1839-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Zevatskiy YE, Ruzanov DO, Samoylov DV. Photometric method for determination of acidity constants through integral spectra analysis. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 141:161-168. [PMID: 25668697 DOI: 10.1016/j.saa.2015.01.045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 01/01/2015] [Accepted: 01/15/2015] [Indexed: 06/04/2023]
Abstract
An express method for determination of acidity constants of organic acids, based on the analysis of the integral transmittance vs. pH dependence is developed. The integral value is registered as a photocurrent of photometric device simultaneously with potentiometric titration. The proposed method allows to obtain pKa using only simple and low-cost instrumentation. The optical part of the experimental setup has been optimized through the exclusion of the monochromator device. Thus it only takes 10-15 min to obtain one pKa value with the absolute error of less than 0.15 pH units. Application limitations and reliability of the method have been tested for a series of organic acids of various nature.
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Affiliation(s)
- Yuriy Eduardovich Zevatskiy
- Saint-Petersburg State University of Technology & Design, Bolshaya Morskaya str. 18, Saint-Petersburg, 191186, Russia
| | - Daniil Olegovich Ruzanov
- Saint-Petersburg State Institute of Technology (Technical University), Moskovskiy ave., 26, Saint-Petersburg, 190013, Russia.
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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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Synthesis of new (arylcarbonyloxy)aminopropanol derivatives and the determination of their physico-chemical properties. OPEN CHEM 2013. [DOI: 10.2478/s11532-013-0302-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AbstractEight hydrochlorides of 3-{2-[(2/4-fluorophenoxy)-ethylamino]}-2-hydroxypropyl-4-alkoxybenzoates and four hydrochlorides of 3-tert-butylamino-2-hydroxypropyl-4-butoxybenzoates were prepared as potential antagonists of the β1-adrenergic receptor (beta-blockers). A multistep synthesis of these compounds is described as well as their detailed analytical characterization. The pharmacokinetic properties of these weak base compounds are significantly influenced by their acid-base dissociation constant, pK a. The knowledge of this value is crucial for new drug development. This paper is aimed at developing a methodology that utilizes pH-dependent 1H NMR spectroscopy for its routine analysis. The selected predicted physico-chemical parameters of the new (arylcarbonyloxy)aminopropanols (i.e., aryloxyaminopropanol derivatives) were compared with the model drugs esmolol and flestolol.
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Huo H, Li T, Zhang L. pKa determination of oxysophocarpine by reversed - phase high performance liquid chromatography. SPRINGERPLUS 2013; 2:270. [PMID: 23853749 PMCID: PMC3701144 DOI: 10.1186/2193-1801-2-270] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Accepted: 05/24/2013] [Indexed: 11/10/2022]
Abstract
BACKGROUND In this study, a RP - HPLC method was applied for determination of pKa value by using the dependence of the capacity factor (k) on the pH of the mobile phase for oxysophocarpine (OSP). FINDINGS The effect of the mobile phase composition on the ionization constant was studied by measuring the pKa value at different MeOH concentrations, ranging from 10 to 20% (v/v). Based on all pH - k curves plotted and pH values at inflection point calculated, experimental pKa value obtained for oxysophocarpine was 6.5. CONCLUSION This method was successfully applied to realize low sample consumption, rapid sample throughput, high sensitivity and precision.
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Affiliation(s)
- Huiling Huo
- College of Chinese Traditional Medicine, Guangzhou University of Traditional Chinese Medicine, 232 East of Waihuan Road, University Town, Guangzhou, Guangdong 510006 R.P. China ; College of Chinese Traditional Medicine, Southern Medical University, Guangzhou, Guangdong 510515 R.P. China
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Ionization constants of all seven positional isomers of quinolinesulfonamides and quinoline-N,N-dimethylsulfonamides. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2012.10.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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TAKAYANAGI T, TABARA A, KANETA T. Determination of Acid Dissociation Constant of Degradable Tetrabromophenolphthalein Ethyl Ester by Capillary Zone Electrophoresis. ANAL SCI 2013; 29:547-52. [DOI: 10.2116/analsci.29.547] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Toshio TAKAYANAGI
- Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University
| | - Ayumi TABARA
- Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University
| | - Takashi KANETA
- Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University
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Şanlı S, Altun Y, Alsancak G. Determination of the Dissociation Constants of Some Macrolide Antibiotics in Methanol–Water Binary Mixtures by UV-Spectroscopy and Correlations with the Kamlet and Taft Solvatochromic Parameters. J SOLUTION CHEM 2012. [DOI: 10.1007/s10953-012-9868-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Duran M, Aydemir S. Ab initio studies on acidity and tautomeric equilibrium constants of some benzoxa-, benzothia-, benzoselena-zolinone derivatives. COMPUT THEOR CHEM 2012. [DOI: 10.1016/j.comptc.2012.03.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kuntworbe N, Alany RG, Brimble M, Al-Kassas R. Determination of pKa and forced degradation of the indoloquinoline antimalarial compound cryptolepine hydrochloride. Pharm Dev Technol 2012; 18:866-76. [PMID: 22436019 DOI: 10.3109/10837450.2012.668554] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The study was aimed at determining the acid dissociation constant of cryptolepine hydrochloride and its degradation under stressed conditions. The pKa was determined using buffers in the pH range 10.4-11.6 by spectrophotometry at controlled measurement temperature (20 ± 0.5°C). The stability of the compound was investigated under various stressed conditions including neutral, acid, alkaline, light, dry heat and oxidation at different temperatures. Degradation products were analysed by HPLC. The calculated pKa values (uncorrected and corrected for ionic strength) were 11.09 ± 0.03 and 10.99 ± 0.05, respectively. A graphical approach yielded an uncorrected pKa value of 11.07. Degradation of the compound in water, 0.1 M HCl, 0.1 M NaOH and 3% hydrogen peroxide followed a first order reaction. With proper temperature control and maintenance of uniform ionic strength, a reproducible pKa of cryptolepine is obtainable by spectrophotometry. The compound was found to be highly susceptible to oxidation and relatively stable in neutral and acidic conditions but less so in a basic medium. There were no significant changes in concentration of samples exposed to light and dry heat at 60°C over the study period.
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Affiliation(s)
- Noble Kuntworbe
- School of Pharmacy, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
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Lipka E, Folly-Klan M, Charton J, Vaccher MP, Bonte JP, Vaccher C. Determination of pKa values of benzimidazole derivatives from mobility obtained by capillary electrophoresis. J Pharm Biomed Anal 2010; 53:1267-71. [DOI: 10.1016/j.jpba.2010.07.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2010] [Revised: 07/08/2010] [Accepted: 07/18/2010] [Indexed: 10/19/2022]
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Ebead Y. The role of the medium on the acid dissociation constants of some azo dyes in view of experimental and theoretical data. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2010.08.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Ebead Y, Salman H, Khodari M, Ahmed A. Spectrophotometric investigations of the role of the organic solvent on the acid dissociation constants of some azo dyes derived from 2-aminobenzothiazole. J Mol Liq 2010. [DOI: 10.1016/j.molliq.2010.04.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Eseola AO, Li W, Adeyemi OG, Obi-Egbedi NO, Woods JA. Hemilability of 2-(1H-imidazol-2-yl)pyridine and 2-(oxazol-2-yl)pyridine ligands: Imidazole and oxazole ring Lewis basicity, Ni(II)/Pd(II) complex structures and spectra. Polyhedron 2010. [DOI: 10.1016/j.poly.2010.02.039] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Zevatskii YE, Samoilov DV, Mchedlov-Petrosyan NO. Conthemporary methods for the experimental determination of dissociation constants of organic acids in solutions. RUSS J GEN CHEM+ 2009. [DOI: 10.1134/s1070363209090138] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Babić S, Horvat AJ, Mutavdžić Pavlović D, Kaštelan-Macan M. Determination of pKa values of active pharmaceutical ingredients. Trends Analyt Chem 2007. [DOI: 10.1016/j.trac.2007.09.004] [Citation(s) in RCA: 348] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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