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Peng H, Yang X, Fang H, Zhang Z, Zhao J, Zhao T, Liu J, Li Y. Simultaneous effect of different chromatographic conditions on the chromatographic retention of pentapeptide derivatives (HGRFG and NPNPT). Front Chem 2023; 11:1171824. [PMID: 37143822 PMCID: PMC10151710 DOI: 10.3389/fchem.2023.1171824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 03/29/2023] [Indexed: 05/06/2023] Open
Abstract
Introduction: Oligopeptides exhibit great prospects for clinical application and its separation is of great importance in new drug development. Methods: To accurately predict the retention of pentapeptides with analogous structures in chromatography, the retention times of 57 pentapeptide derivatives in seven buffers at three temperatures and four mobile phase compositions were measured via reversed-phase high-performance liquid chromatography. The parameters ( k H A , k A , and p K a ) of the acid-base equilibrium were obtained by fitting the data corresponding to a sigmoidal function. We then studied the dependence of these parameters on the temperature (T), organic modifier composition (φ, methanol volume fraction), and polarity ( P m N parameter). Finally, we proposed two six-parameter models with (1) pH and T and (2) pH and φ or P m N as the independent variables. These models were validated for their prediction capacities by linearly fitting the predicted retention factor k-value and the experimental k-value. Results: The results showed that log k H A and log k A exhibited linear relationships with 1 / T , φ or P m N for all pentapeptides, especially for the acid pentapeptides. In the model of pH and T, the correlation coefficient (R2) of the acid pentapeptides was 0.8603, suggesting a certain prediction capability of chromatographic retention. Moreover, in the model of pH and φ or P m N , the R2 values of the acid and neutral pentapeptides were greater than 0.93, and the average root mean squared error was approximately 0.3, indicating that the k-values could be effectively predicted. Discussion: In summary, the two six-parameter models were appropriate to characterize the chromatographic retention of amphoteric compounds, especially the acid or neutral pentapeptides, and could predict the chromatographic retention of pentapeptide compounds.
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Affiliation(s)
- Huan Peng
- Center for Brain Science, The First Affiliated Hospital of Xi’ an Jiaotong University, Xi’an, Shaanxi, China
- College of Life Science, Northwest University, Xi’an, Shaanxi, China
| | - Xiangrong Yang
- College of Life Science, Northwest University, Xi’an, Shaanxi, China
- Kangya of Ningxia Pharmaceutical Co., Ltd., Yinchuan, China
| | - Huanle Fang
- Medical College, Peihua University, Xi’an, Shaanxi, China
| | - Zhongqi Zhang
- Department of Polypeptide Engineering, Active Protein and Polypeptide Engineering Center of Xi’an Hui Kang, Xi’an, Shaanxi, China
| | - Jinli Zhao
- Department of Polypeptide Engineering, Active Protein and Polypeptide Engineering Center of Xi’an Hui Kang, Xi’an, Shaanxi, China
| | - Te Zhao
- College of Electronic Engineering, Xidian University, Xi’an, Shaanxi, China
| | - Jianli Liu
- College of Life Science, Northwest University, Xi’an, Shaanxi, China
- Medical College, Peihua University, Xi’an, Shaanxi, China
- *Correspondence: Yan Li, ; Jianli Liu,
| | - Yan Li
- Center for Brain Science, The First Affiliated Hospital of Xi’ an Jiaotong University, Xi’an, Shaanxi, China
- *Correspondence: Yan Li, ; Jianli Liu,
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Zhu L, Tang S, Chen D, Li C, Shao L, Ouyang G, Wang Z, Li Z. Synthesis and antibacterial activity of indole 3-substituted-[1,2,4]triazole derivatives. Chem Pap . [DOI: 10.1007/s11696-022-02393-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Flieger J, Orzeł A, Kowalska-Kępczyńska A, Pizoń M, Trębacz H, Majerek D, Plech T, Płaziński W. Teicoplanin-Modified HPLC Column as a Source of Experimental Parameters for Prediction of the Anticonvulsant Activity of 1,2,4-Triazole-3-Thiones by the Regression Models. Materials (Basel) 2020; 13:E2650. [PMID: 32532041 PMCID: PMC7321613 DOI: 10.3390/ma13112650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 05/27/2020] [Accepted: 05/29/2020] [Indexed: 11/16/2022]
Abstract
The cell membrane is a complex system that consists of lipids, proteins, polysaccharides, and amphiphilic phospholipids. It plays an important role in ADME processes that are responsible for the final pharmaceutical effects of xenobiotics (bioavailability, activity). To study drug-membrane interaction at the molecular level, several high-performance liquid chromatography (HPLC) membrane model systems have been proposed which are mimicking mainly its lipid character. The aim of this work was to study interactions of new synthesized antiepileptic compounds of 4-alkyl-5-(3-chlorophenyl)-2,4-dihydro-3H-1,2,4-triazole-3-thione derivatives with Chirobiotic column containing glycoprotein ligand attached to the silica matrix. The affinity of the analytes to immobilized glycoprotein ligand was examined chromatographically in reversed-phase mode. The thermodynamics of interactions between bioactive compounds and teicoplanin was studied in terms of the van't Hoff linear relationship ln k vs. 1/T in the range of 5-45 °C. Change in enthalpy (ΔH°), change in entropy (ΔS°) and change in Gibbs free energy (ΔG°) were estimated utilizing graphical extrapolation and interpolation methods. The density functional theory (DFT) approach and docking simulations were used to get the molecular interpretation and prove the obtained experimental results. Cross-correlations of chromatographic and thermodynamic parameters with non-empirical topological and quantum chemical indices suggest that the polarizability of analytes appears to be responsible for the interactions of the tested molecules with teicoplanin and, ultimately, their retention on the column. Experimental and theoretical parameters were subjected to statistical analysis using regression models. Partial least squares (PLS) regression model showed the usefulness of the experimentally measured parameter φ0 (MeOH) to discriminate between anticonvulsant active and inactive 1,2,4-triazole-3-thione derivatives. Obtained results point out the usefulness of interaction of potential anticonvulsants with glycoprotein class of compounds to anticipate their activity.
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Affiliation(s)
- Jolanta Flieger
- Department of Analytical Chemistry, Medical University of Lublin, Chodźki 4a, 20-093 Lublin, Poland;
| | - Anna Orzeł
- Faculty of Medicine, Medical University of Lublin, Aleje Racławickie 1, 20-059 Lublin, Poland;
| | - Anna Kowalska-Kępczyńska
- Department of Biochemical Diagnostics, Medical University of Lublin, Staszica 16, 20-081 Lublin, Poland;
| | - Magdalena Pizoń
- Department of Analytical Chemistry, Medical University of Lublin, Chodźki 4a, 20-093 Lublin, Poland;
| | - Hanna Trębacz
- Chair and Department of Biophysics, Medical University of Lublin, Jaczewskiego 4, 20-090 Lublin, Poland;
| | - Dariusz Majerek
- Department of Applied Mathematics, University of Technology, Nadbystrzycka 38D, 20-618 Lublin, Poland;
| | - Tomasz Plech
- Department of Pharmacology, Faculty of Nursing and Health Sciences, Medical University of Lublin, Chodźki 4a, 20-093 Lublin, Poland;
| | - Wojciech Płaziński
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland;
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Tanase M, Soare A, David V, Moldoveanu SC. Sources of Nonlinear van't Hoff Temperature Dependence in High-Performance Liquid Chromatography. ACS Omega 2019; 4:19808-19817. [PMID: 31788613 PMCID: PMC6882149 DOI: 10.1021/acsomega.9b02689] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 11/05/2019] [Indexed: 05/22/2023]
Abstract
In HPLC, the nonlinear behavior of the retention factor k' with temperature (dependence of ln k' on 1/T) can be attributed to the multiple interactions of a unique analyte in the separation process and/or to the existence in solution of multiple forms of the analyte (also leading to different free enthalpies of interaction). In this study, several examples of nonlinear retention-temperature dependence are evaluated for both reversed-phase (RP) and hydrophilic interaction chromatography (HILIC) separations. The potential explanation for nonlinear retention-temperature behavior is evaluated for each example, some caused by multiple interactions in the separation system of a unique analyte and others by multiple forms of the analyte. In cases where the analyte does not have more forms and the separation is based predominantly on one type of interaction (e.g., hydrophobic interaction in RP-HPLC), the dependence is linear, as expected. By studying the changes in the chemical structure of a compound as a function of pH it is possible to decide, in many cases, if a unique form or multiple forms of a compound are present in the solution. The use of this information allows us to determine when the lack of linearity (when present) is caused by multiple interactions in the separation system (for one form of the compound) and when more forms are causing the lack of linearity. The approximation with a quadratic form for the nonlinear dependence has been verified in most cases to be good, and only minor improvements were obtained when using higher polynomial dependencies.
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Affiliation(s)
- Maria Tanase
- Faculty of Chemistry,
Department of Analytical Chemistry, University
of Bucharest, Bucharest 050663, Romania
| | - Andreia Soare
- Faculty of Chemistry,
Department of Analytical Chemistry, University
of Bucharest, Bucharest 050663, Romania
| | - Victor David
- Faculty of Chemistry,
Department of Analytical Chemistry, University
of Bucharest, Bucharest 050663, Romania
| | - Serban C. Moldoveanu
- R.
J. Reynolds Tobacco Co., Winston-Salem, North Carolina 27101, United States
- E-mail: . Phone: (336) 741-7948
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Flieger J, Kawka J, Tatarczak-Michalewska M. Levels of the Thiocyanate in the Saliva of Tobacco Smokers in Comparison to e-Cigarette Smokers and Nonsmokers Measured by HPLC on a Phosphatidylcholine Column. Molecules 2019; 24:molecules24203790. [PMID: 31640293 PMCID: PMC6832790 DOI: 10.3390/molecules24203790] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 10/17/2019] [Accepted: 10/20/2019] [Indexed: 02/06/2023] Open
Abstract
The aim of the study was to estimate the thiocyanate levels in saliva of cigarette smokers in comparison to e-cigarette smokers and nonsmokers. To improve our understanding of the influence of smoking on the oral level of thiocyanate, we conducted an assessment of human saliva, in 24 individuals (eight tobacco smokers, eight e-cigarette smokers, and eight nonsmokers). High-Performance Liquid Chromatography with ultraviolet detection (HPLC-UV) using a unique phosphatidylcholine column was applied in this assay. Thiocyanate ion was detected directly by its absorbance at 210 nm. The method presents a new application of the IAM (Immobilized Artificial Membrane) column for quantification of inorganic anions. The whole process meets the criteria of green chemistry because it was carried out without the use of organic solvents. For compensating matrix effects, an eight-point standard addition protocol was used to quantify the thiocyanate level in saliva samples. The calibration graphs were linear in the range of 5–100 mg L−1 with a correlation coefficient higher than 0.99. The thiocyanate concentrations in the saliva of tobacco smokers, e-cigarette smokers, and nonsmokers were found in the range of 121.25–187.54 mg L−1, 121.24–244.11 mg L−1, 33.03–79.49 mg L−1, respectively. The present study indicates an obvious statistically significant elevation in salivary thiocyanate level in tobacco smokers in comparison to nonsmokers. The phosphatidylcholine-based stationary phase proved to be suitable for the detection and quantification of the thiocyanate ion. The salivary thiocyanate levels in e-cigarette smokers were not significantly different in comparison to tobacco smokers but higher if compared to nonsmokers. The criterion for statistical significance was p < 0.05.
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Affiliation(s)
- Jolanta Flieger
- Department of Analytical Chemistry, Medical University of Lublin, Chodźki 4A, 20-093 Lublin, Poland.
| | - Justyna Kawka
- Department of Analytical Chemistry, Medical University of Lublin, Chodźki 4A, 20-093 Lublin, Poland.
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