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Shrestha D, Nayaju T, Kandel M, Pradhananga RR, Park CH, Kim CS. Rice husk-derived mesoporous biogenic silica nanoparticles for gravity chromatography. Heliyon 2023; 9:e15142. [PMID: 37095947 PMCID: PMC10121805 DOI: 10.1016/j.heliyon.2023.e15142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 03/28/2023] [Accepted: 03/28/2023] [Indexed: 04/04/2023] Open
Abstract
Biogenic silica nanoparticle is a superb alternative to synthetic silica because of their highly active, polar, and porous nanostructure with a large interior area. Among the available agricultural bioresources, biogenic silica extracted from rice husks could be a simple, easily available, and cost-effective resource to use as the stationary phase for the column chromatographic technique. In the present study, highly pure amorphous biogenic silica nanoparticles (bSNPs) were synthesized using rice husk by a controlled combustion route followed by the sol-gel method. The bSNPs show better performance for the separation and isolation of ortho- and para-nitrophenol and nitroaniline. The outstanding performance of the as-synthesized bSNPs is attributed to the high surface area, high porosity, and presence of Si-OH polar bonds. These preliminary findings imply that rice husk, an agricultural waste, could be an alternative source of silica and applicable as a stationary phase in column chromatography.
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Affiliation(s)
- Devendra Shrestha
- Amrit Science Campus, Tribhuvan University, Kathmandu, Nepal
- Department of Bionanotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Republic of Korea
| | - Tulsi Nayaju
- Department of Bionanotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Republic of Korea
| | - M.R. Kandel
- Amrit Science Campus, Tribhuvan University, Kathmandu, Nepal
| | - Raja Ram Pradhananga
- Amrit Science Campus, Tribhuvan University, Kathmandu, Nepal
- Research Institute for Material Science and Nanotechnology (RIMSN), Kathmandu, Nepal
- Corresponding author. Amrit Science Campus, Tribhuvan University, Kathmandu, Nepal.
| | - Chan Hee Park
- Department of Bionanotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Republic of Korea
- Division of Mechanical Design Engineering, Jeonbuk National University, Jeonju, Republic of Korea
- Corresponding author. Department of Bionanotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Republic of Korea.
| | - Cheol Sang Kim
- Department of Bionanotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Republic of Korea
- Division of Mechanical Design Engineering, Jeonbuk National University, Jeonju, Republic of Korea
- Corresponding author. Department of Bionanotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Republic of Korea.
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Development of liquid chromatographic and UV-visible spectrophotometric methods for determination of pK a values of folic acid antimetabolites. J Pharm Biomed Anal 2022; 212:114647. [PMID: 35180566 DOI: 10.1016/j.jpba.2022.114647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Revised: 02/02/2022] [Accepted: 02/04/2022] [Indexed: 11/20/2022]
Abstract
In this study, the values of ionization/protonation constants (pKa) of pemetrexed and raltitrexed, which are folic acid antimetabolites, were determined by reversed-phase liquid chromatography (RPLC) and UV-visible spectrophotometric methods at 25 °C. The pKass values were evaluated by retention time (tR) in binary acetonitrile-water mixtures with acetonitrile (ACN) contents of 13%, 15%, 17% and 20% (v/v) for the RPLC method and 13%, 15% and 17% (v/v) for the spectrophotometric method. The aqueous pKa values (pKaww) of the studied compounds were calculated from the pKass value using the macroscopic parameters (mole fraction and dielectric constant), which play an important role in solvent properties. In addition, the degree of ionization of pemetrexed and raltitrexed was calculated using the pKaww values.
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Luo F, Guo Z, Cao C, Fan L, Zhang W. [Determination of absolute mobility and dissociation constant of lovastatin using capillary electrophoresis and empirical equation of ion mobility]. Se Pu 2021; 39:1362-1367. [PMID: 34812009 PMCID: PMC9404114 DOI: 10.3724/sp.j.1123.2021.01014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
作为一种可以预防动脉粥样硬化和冠心病的潜在药物洛伐他汀,其绝对淌度m0和解离常数pKa值的测定有助于其性质与应用的研究。在前期相关研究基础上,该文提出了一种基于毛细管区带电泳(CZE)和离子淌度经验公式测定洛伐他汀m0和pKa的新方法。首先,根据经验公式由实际淌度(mact)、有效淌度(meff)和m0之间的关系推导出m0的计算公式。对于一元酸HA,根据之前m0的计算公式,以氢离子的浓度为自变量,meff的倒数为因变量可得到一条直线。根据这条直线的斜率计算得到pKa。为了验证该方法的可行性和可靠性,应用该方法测定了巴比妥酸、苯甲酸、苄胺、苯酚、间甲酚等有机酸碱的m0和pKa值。同时,对于pH值低于6的缓冲体系,采用反向毛细管电泳技术,测定其pKa,并将测得的实验结果与理论参考值进行对比,发现两者具有较高的一致性,m0的标准偏差小于6.0%, pKa的标准偏差小于6.2%,且由线性回归方程的相关系数(R)可以看出测定pKa时的线性回归直线拟合度较好,说明该文建立的新方法具有较高的可靠性。最后基于这种CZE与经验公式结合的新方法,采用二甲基亚砜(DMSO)作为电渗流标记物测定了洛伐他汀的m0和pKa,得到的值分别为-1.70×10-8 m2/(V·s)和9.00。该方法适用于酸性和碱性分析物m0和pKa等理化参数的测定,在药物分析尤其是新药理化特性研究中具有重要意义。
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Affiliation(s)
- Fang Luo
- School of Life Science and Biotechnology, State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zehua Guo
- School of Electronic Information & Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Chengxi Cao
- School of Electronic Information & Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Liuyin Fan
- Student Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Wei Zhang
- School of Life Science and Biotechnology, State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai 200240, China
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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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Nakov N, Acevska J, Brezovska K, Kavrakovski Z, Petkovska R, Dimitrovska A. Characterization of physicochemical properties of substances using chromatographic separation methods. MAKEDONSKO FARMACEVTSKI BILTEN 2020. [DOI: 10.33320/maced.pharm.bull.2020.66.03.074] [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] Open
Affiliation(s)
- Natalija Nakov
- Faculty of Pharmacy, Ss. Cyril and Methodius University, Mother Theresa 47, 1000 Skopje, R. North Macedonia
| | - Jelena Acevska
- Faculty of Pharmacy, Ss. Cyril and Methodius University, Mother Theresa 47, 1000 Skopje, R. North Macedonia
| | - Katerina Brezovska
- Faculty of Pharmacy, Ss. Cyril and Methodius University, Mother Theresa 47, 1000 Skopje, R. North Macedonia
| | - Zoran Kavrakovski
- Faculty of Pharmacy, Ss. Cyril and Methodius University, Mother Theresa 47, 1000 Skopje, R. North Macedonia
| | - Rumenka Petkovska
- Faculty of Pharmacy, Ss. Cyril and Methodius University, Mother Theresa 47, 1000 Skopje, R. North Macedonia
| | - Aneta Dimitrovska
- Faculty of Pharmacy, Ss. Cyril and Methodius University, Mother Theresa 47, 1000 Skopje, R. North Macedonia
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Shalaby AA, Mohamed AA. Determination of acid dissociation constants of Alizarin Red S, Methyl Orange, Bromothymol Blue and Bromophenol Blue using a digital camera. RSC Adv 2020; 10:11311-11316. [PMID: 35495332 PMCID: PMC9050617 DOI: 10.1039/c9ra10568a] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 03/13/2020] [Indexed: 11/21/2022] Open
Abstract
Acid dissociation constants (pKa) are important parameters for the characterization of organic and inorganic compounds. They play a crucial role in different physical, chemical, and biological studies. Herein, we introduce a new approach for the determination of acid dissociation constant based on digital image analysis using a low-cost, precise, accurate, sensitive, and portable home-made, camera-based platform. Digital images of Alizarin Red S, Bromophenol Blue, Bromothymol Blue, and Methyl Orange solutions were captured at various pH values. The captured images were analysed to obtain the RGB (Red, Green, and Blue) colour intensities that are used to calculate the RGB colour absorbances. The pKa values were calculated from the RGB colour absorbance–pH relationship using graphical and mathematical methods, and with the aid of DATAN software. For the four studied dyes, the results obtained from digital image analysis were in excellent agreement with the data of sophisticated spectrophotometers and the previously reported literature data. Acid dissociation constants (pKa) are important parameters for the characterization of organic and inorganic compounds.![]()
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Affiliation(s)
- Ahmed A Shalaby
- Department of Chemistry, Faculty of Science, Ain Shams University Abbassia Cairo-11566 Egypt +202 24831836 +201001578849
| | - Ashraf A Mohamed
- Department of Chemistry, Faculty of Science, Ain Shams University Abbassia Cairo-11566 Egypt +202 24831836 +201001578849
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Ma C, Wang W, Huang Z, Chen X, Ye W, Pan K, Ma R, Xue K, Cai S, Huang Y, Pan X, Wu C. Effect of the cargo lipophilicity on powder micromeritics properties of drug-loaded solid lipid microparticles. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2019.03.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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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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Nakov N, Acevska J, Brezovska K, Dimitrovska A. Overview on chromatographic and potentiometric based approaches for pKa determination of sparingly soluble substances. MAKEDONSKO FARMACEVTSKI BILTEN 2018. [DOI: 10.33320/maced.pharm.bull.2017.63.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The dissociation constant (pKa) is one of the most important physicochemical property of the compounds and it is of great importance for the pharmaceutical industry. Many of the active pharmaceutical ingredients are sparingly soluble in water or have no chromophore, thus the conventional UV/Vis spectrometry and potentiometry methods are not applicable. This article presents an overview of several approaches based on RP-HPLC and cosolvent/surfactant potentiometry that have been recently published for the pKa determination of sparingly soluble active pharmaceutical ingredients. Additionally, different calculation methods that have been used for the estimation of the aqueous dissociation constant are summarized.
Keywords: dissociation constant, pKa, sparingly soluble substances, determination, reverse-phase liquid chromatography, potentiometry, surfactants
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Affiliation(s)
- Natalija Nakov
- Institute of Applied Chemistry and Pharmaceutical Analysis, Faculty of Pharmacy, Ss. Cyril and Methodius University, 1000 Skopje, Republic of Macedonia
| | - Jelena Acevska
- Institute of Applied Chemistry and Pharmaceutical Analysis, Faculty of Pharmacy, Ss. Cyril and Methodius University, 1000 Skopje, Republic of Macedonia
| | - Katerina Brezovska
- Institute of Applied Chemistry and Pharmaceutical Analysis, Faculty of Pharmacy, Ss. Cyril and Methodius University, 1000 Skopje, Republic of Macedonia
| | - Aneta Dimitrovska
- Institute of Applied Chemistry and Pharmaceutical Analysis, Faculty of Pharmacy, Ss. Cyril and Methodius University, 1000 Skopje, Republic of Macedonia
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