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Enantioresolution and Binding Affinity Studies on Human Serum Albumin: Recent Applications and Trends. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9110304] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The interaction between proteins and drugs or other bioactive compounds has been widely explored over the past years. Several methods for analysis of this phenomenon have been developed and improved. Nowadays, increasing attention is paid to innovative methods, such as high performance affinity liquid chromatography (HPALC) and affinity capillary electrophoresis (ACE), taking into account various advantages. Moreover, the development of separation methods for the analysis and resolution of chiral drugs has been an area of ongoing interest in analytical and medicinal chemistry research. In addition to bioaffinity binding studies, both HPALC and ACE al-low one to perform other type of analyses, namely, displacement studies and enantioseparation of racemic or enantiomeric mixtures. Actually, proteins used as chiral selectors in chromatographic and electrophoretic methods have unique enantioselective properties demonstrating suitability for the enantioseparation of a large variety of chiral drugs or other bioactive compounds. This review is mainly focused in chromatographic and electrophoretic methods using human serum albumin (HSA), the most abundant plasma protein, as chiral selector for binding affinity analysis and enantioresolution of drugs. For both analytical purposes, updated examples are presented to highlight recent applications and current trends.
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Begum S, Shareef MZ, Bharathi K. Part-II- in silico drug design: application and success. PHYSICAL SCIENCES REVIEWS 2021. [DOI: 10.1515/psr-2018-0160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In silico tools have indeed reframed the steps involved in traditional drug discovery and development process and the term in silico has become a familiar term in pharmaceutical sector like the terms in vitro and in vivo. The successful design of HIV protease inhibitors, Saquinavir, Indinavir and other important medicinal agents, initiated interest of researchers in structure based drug design approaches (SBDD). The interactions between biomolecules and a ligand, binding energy, free energy and stability of biomolecule-ligand complex can be envisioned and predicted by applying molecular docking studies. Protein-ligand, protein-protein, DNA-ligand interactions etc. aid in elucidating molecular level mechanisms of drug molecules. In the Ligand based drug design (LBDD) approaches, QSAR studies have tremendously contributed to the development of antimicrobial, anticancer, antimalarial agents. In the recent years, multiQSAR (mt-QSAR) approaches have been successfully employed for designing drugs against multifactorial diseases. Output of a research in several instances is rewarding when both SBDD and LBDD approaches are combined. Application of in silico studies for prediction of pharmacokinetics was once a real challenge but one can see unlimited number publications comprising tools, data bases which can accurately predict almost all the pharmacokinetic parameters. Absorption, distribution, metabolism, transporters, blood brain barrier permeability, hERG toxicity, P-gp affinity and several toxicological end points can be accurately predicted for a candidate molecule before its synthesis. In silico approaches are greatly encouraged a result of growing limitations and new legislations related to the animal use for research. The combined use of in vitro data and in silico tools will definitely decrease the use of animal testing in the future.In this chapter, in silico approaches and their applications are reviewed and discussed giving suitable examples.
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Affiliation(s)
- Shaheen Begum
- Institute of Pharmaceutical Technology , Sri Padmavati Mahila Visvavidyalayam , 517501 Tirupati , Andhra Pradesh , India
| | - Mohammad Zubair Shareef
- Institute of Pharmaceutical Technology , Sri Padmavati Mahila Visvavidyalayam , 517501 Tirupati , Andhra Pradesh , India
| | - Koganti Bharathi
- Institute of Pharmaceutical Technology , Sri Padmavati Mahila Visvavidyalayam , 517501 Tirupati , Andhra Pradesh , India
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Li Z, Hage DS. Analysis of stereoselective drug interactions with serum proteins by high-performance affinity chromatography: A historical perspective. J Pharm Biomed Anal 2017; 144:12-24. [PMID: 28094095 PMCID: PMC5505820 DOI: 10.1016/j.jpba.2017.01.026] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 01/06/2017] [Accepted: 01/10/2017] [Indexed: 01/09/2023]
Abstract
The interactions of drugs with serum proteins are often stereoselective and can affect the distribution, activity, toxicity and rate of excretion of these drugs in the body. A number of approaches based on affinity chromatography, and particularly high-performance affinity chromatography (HPAC), have been used as tools to study these interactions. This review describes the general principles of affinity chromatography and HPAC as related to their use in drug binding studies. The types of serum agents that have been examined with these methods are also discussed, including human serum albumin, α1-acid glycoprotein, and lipoproteins. This is followed by a description of the various formats based on affinity chromatography and HPAC that have been used to investigate drug interactions with serum proteins and the historical development for each of these formats. Specific techniques that are discussed include zonal elution, frontal analysis, and kinetic methods such as those that make use of band-broadening measurements, peak decay analysis, or ultrafast affinity extraction.
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Affiliation(s)
- Zhao Li
- Department of Chemistry, University of Nebraska, Lincoln, NE, USA
| | - David S Hage
- Department of Chemistry, University of Nebraska, Lincoln, NE, USA.
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Hall ML, Jorgensen WL, Whitehead L. Automated Ligand- and Structure-Based Protocol for in Silico Prediction of Human Serum Albumin Binding. J Chem Inf Model 2013; 53:907-22. [DOI: 10.1021/ci3006098] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michelle Lynn Hall
- Novartis Institutes for Biomedical Research, 100 Technology Square, Cambridge,
Massachusetts 02143, United States
| | - William L. Jorgensen
- Department
of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Lewis Whitehead
- Novartis Institutes for Biomedical Research, 100 Technology Square, Cambridge,
Massachusetts 02143, United States
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Hage DS, Anguizola JA, Jackson AJ, Matsuda R, Papastavros E, Pfaunmiller E, Tong Z, Vargas-Badilla J, Yoo MJ, Zheng X. CHROMATOGRAPHIC ANALYSIS OF DRUG INTERACTIONS IN THE SERUM PROTEOME. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2011; 3:10.1039/C1AY05068K. [PMID: 24223625 PMCID: PMC3820373 DOI: 10.1039/c1ay05068k] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The binding of drugs with serum proteins and binding agents such as human serum albumin, α1-acid glycoprotein, and lipoproteins is an important process in determining the activity and fate of many pharmaceuticals in the body. A variety of techniques have been used to study drug interactions with serum proteins, but there is still a need for faster or better methods for such work. High-performance liquid chromatography (HPLC) is one tool that has been utilized in many formats for these types of measurements. Advantages of using HPLC for this application include its speed and precision, its ability to be automated, its good limits of detection, and its compatibility with a wide range of assay formats and detectors. This review will discuss various approaches in which HPLC can be employed for the study of drug-protein interactions. These techniques include the use of soluble proteins in zonal elution and frontal analysis methods or vacancy techniques such as the Hummel-Dreyer method. Zonal elution and frontal analysis methods that make use of immobilized proteins and high-performance affinity chromatography will also be presented. A variety of applications will be examined, ranging from the determination of free drug fractions to the measurement of the strength or rate of a drug-protein interaction. Newer developments that will be discussed include recent work in the creation of novel mathematical approaches for HPLC studies of drug-protein binding, the use of HPLC methods for the high-throughput screening of drug-protein binding, and the creation and use of affinity monoliths or affinity microcolumns for examining drug-protein systems.
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Affiliation(s)
- David S. Hage
- Chemistry Department, University of Nebraska, Lincoln, NE USA
| | | | - Abby J. Jackson
- Chemistry Department, University of Nebraska, Lincoln, NE USA
| | - Ryan Matsuda
- Chemistry Department, University of Nebraska, Lincoln, NE USA
| | | | | | - Zenghan Tong
- Chemistry Department, University of Nebraska, Lincoln, NE USA
| | | | - Michelle J. Yoo
- Chemistry Department, University of Nebraska, Lincoln, NE USA
| | - Xiwei Zheng
- Chemistry Department, University of Nebraska, Lincoln, NE USA
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6
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Lämmerhofer M. Chiral recognition by enantioselective liquid chromatography: mechanisms and modern chiral stationary phases. J Chromatogr A 2009; 1217:814-56. [PMID: 19906381 DOI: 10.1016/j.chroma.2009.10.022] [Citation(s) in RCA: 516] [Impact Index Per Article: 34.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2009] [Revised: 09/30/2009] [Accepted: 10/07/2009] [Indexed: 11/19/2022]
Abstract
An overview of the state-of-the-art in LC enantiomer separation is presented. This tutorial review is mainly focused on mechanisms of chiral recognition and enantiomer distinction of popular chiral selectors and corresponding chiral stationary phases including discussions of thermodynamics, additivity principle of binding increments, site-selective thermodynamics, extrathermodynamic approaches, methods employed for the investigation of dominating intermolecular interactions and complex structures such as spectroscopic methods (IR, NMR), X-ray diffraction and computational methods. Modern chiral stationary phases are discussed with particular focus on those that are commercially available and broadly used. It is attempted to provide the reader with vivid images of molecular recognition mechanisms of selected chiral selector-selectand pairs on basis of solid-state X-ray crystal structures and simulated computer models, respectively. Such snapshot images illustrated in this communication unfortunately cannot account for the molecular dynamics of the real world, but are supposed to be helpful for the understanding. The exploding number of papers about applications of various chiral stationary phases in numerous fields of enantiomer separations is not covered systematically.
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Affiliation(s)
- Michael Lämmerhofer
- Christian Doppler Laboratory for Molecular Recognition Materials, Department of Analytical Chemistry and Food Chemistry, University of Vienna, Waehringer Strasse 38, A-1090 Vienna, Austria.
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7
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Del Rio A. Exploring enantioselective molecular recognition mechanisms with chemoinformatic techniques. J Sep Sci 2009; 32:1566-84. [DOI: 10.1002/jssc.200800693] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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8
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Yin CQ, He BJ, Li SR, Liu YQ, Bai ZW. Immobilization of (1S,2R)-(+)-2-amino-1,2-diphenylethanol derivates on aminated silica gel with different linkages as chiral stationary phases and their enantioseparation evaluation by HPLC. Chirality 2009; 21:442-8. [DOI: 10.1002/chir.20618] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hage DS, Jackson A, Sobansky MR, Schiel JE, Yoo MJ, Joseph KS. Characterization of drug-protein interactions in blood using high-performance affinity chromatography. J Sep Sci 2009; 32:835-53. [PMID: 19278006 PMCID: PMC2771590 DOI: 10.1002/jssc.200800640] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The binding of drugs with proteins in blood, serum, or plasma is an important process in determining the activity, distribution, rate of excretion, and toxicity of drugs in the body. High-performance affinity chromatography (HPAC) has received a great deal of interest as a means for studying these interactions. This review examines the various techniques that have been used in HPAC to examine drug-protein binding and discusses the types of information that can be obtained through this approach. A comparison of these techniques with traditional methods for binding studies (e.g., equilibrium dialysis and ultrafiltration) will also be presented. The use of HPAC with specific serum proteins and binding agents will then be discussed, including HSA and alpha(1)-acid glycoprotein (AGP). Several examples from the literature are provided to illustrate the applications of such research. Recent developments in this field are also described, such as the use of improved immobilization techniques, new data analysis methods, techniques for working directly with complex biological samples, and work with immobilized lipoproteins. The relative advantages and limitations of the methods that are described will be considered and the possible use of these techniques in the high-throughput screening or characterization of drug-protein binding will be discussed.
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Affiliation(s)
- David S Hage
- Department of Chemistry, University of Nebraska, Lincoln, NE 68588-0304, USA.
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Asadpour-Zeynali K, Jalili-Jahani N. Modeling GC-ECD retention times of pentafluorobenzyl derivatives of phenol by using artificial neural networks. J Sep Sci 2008; 31:3788-95. [DOI: 10.1002/jssc.200800418] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Del Rio A, Gasteiger J. Encoding Absolute Configurations with Chiral Enantiophore Descriptors. Application to the Order of Elution of Enantiomers in Liquid Chromatography. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/qsar.200810066] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Natalini B, Macchiarulo A, Sardella R, Massarotti A, Pellicciari R. Descriptive structure-separation relationship studies in chiral ligand-exchange chromatography. J Sep Sci 2008; 31:2395-403. [DOI: 10.1002/jssc.200800102] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Mallik R, Hage DS. Development of an affinity silica monolith containing human serum albumin for chiral separations. J Pharm Biomed Anal 2008; 46:820-30. [PMID: 17475436 PMCID: PMC2361093 DOI: 10.1016/j.jpba.2007.03.017] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2007] [Revised: 03/09/2007] [Accepted: 03/19/2007] [Indexed: 11/15/2022]
Abstract
An affinity monolith based on silica and containing immobilized human serum albumin (HSA) was developed and evaluated in terms of its binding, efficiency and selectivity in chiral separations. The results were compared with data obtained for the same protein when used as a chiral stationary phase with HPLC-grade silica particles or a monolith based on a copolymer of glycidyl methacrylate (GMA) and ethylene dimethacrylate (EDMA). The surface coverage of HSA in the silica monolith was similar to values obtained with silica particles and a GMA/EDMA monolith. However, the higher surface area of the silica monolith gave a material that contained 1.3-2.2-times more immobilized HSA per unit volume when compared to silica particles or a GMA/EDMA monolith. The retention, efficiency and resolving power of the HSA silica monolith were evaluated using two chiral analytes: d/l-tryptophan and R/S-warfarin. The separation of R- and S-ibuprofen was also considered. The HSA silica monolith gave higher retention and higher or comparable resolution and efficiency when compared with HSA columns that contained silica particles or a GMA/EDMA monolith. The silica monolith also gave lower back pressures and separation impedances than these other materials. It was concluded that silica monoliths can be valuable alternatives to silica particles or GMA/EDMA monoliths when used with immobilized HSA as a chiral stationary phase.
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Affiliation(s)
- Rangan Mallik
- Chemistry Department, University of Nebraska, Lincoln, NE 68588-0304, USA
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Del Rio A, Gasteiger J. Simple method for the prediction of the separation of racemates with high-performance liquid chromatography on Whelk-O1 chiral stationary phase. J Chromatogr A 2008; 1185:49-58. [PMID: 18272162 DOI: 10.1016/j.chroma.2008.01.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2007] [Revised: 12/13/2007] [Accepted: 01/07/2008] [Indexed: 11/26/2022]
Abstract
A simple method for the prediction of whether or not a racemate can be separated on a Whelk-O1 chiral stationary phase has been developed. In this approach, molecules are represented by counting the number of atom types of the neighbors spheres of the chiral center. A decision tree is then used to decide based on a few of these atom count descriptors whether a given racemate can be separated. High values of correct prediction were obtained, namely with more than 94% for training sets and of about 90% for cross-validation results. The same rate of correct prediction was also obtained on an external data set. The descriptors can be rapidly and easily retrieved by just counting the atom types around the chiral center by inspecting the chemical diagram of the molecule. Furthermore, the decision tree model can be applied through the use of a small set of rules that eventually predicts whether or not a racemate is separated. Due to its computational simplicity, the procedure is of interest for experimentalists that need to make rapid assessment of the separation without having to program or input complex formulas.
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Affiliation(s)
- Alberto Del Rio
- Computer-Chemie-Centrum, Universität Erlangen-Nürnberg, Nägelsbachstrasse 25, Erlangen, Germany.
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Affiliation(s)
- Roman Kaliszan
- Department of Biopharmaceutics and Pharmacodynamics, Medical University of Gdańsk, Gen. J. Hallera 107, 80416 Gdańsk, Poland.
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16
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Song Y, Zhou J, Song Y, Xie J, Ye Y. Theoretical analysis on retention behavior of pigments in reversed-phase high-performance liquid chromatographic (HPLC). Comput Biol Med 2007; 37:315-9. [PMID: 16716287 DOI: 10.1016/j.compbiomed.2006.02.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2005] [Revised: 02/22/2006] [Accepted: 02/24/2006] [Indexed: 11/15/2022]
Abstract
Quantitative structure-retention relationship (QSRR) models have been used successfully to predict and explain retention behavior of pigments in reversed-phase high-performance liquid chromatography (HPLC). The semi-empirical quantum chemical method (PM3) in Gaussian98 was employed to calculate a set of molecular descriptors of pigments. Using multiple linear regression (MLR), we obtained empirical functions with high correlation coefficient between retention times and quantum-chemical descriptors. This analysis indicated that the proposed QSRR models were satisfactory.
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Affiliation(s)
- Yuanzhi Song
- Department of Chemistry, Huaiyin Teachers college, Jiangsu Province Key Laboratory for Chemistry of Low-Dimensional Materials, Huaian, PR China.
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Wa C, Cerny R, Hage DS. Identification and quantitative studies of protein immobilization sites by stable isotope labeling and mass spectrometry. Anal Chem 2007; 78:7967-77. [PMID: 17134129 PMCID: PMC2662750 DOI: 10.1021/ac0609935] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A method was developed for characterizing immobilization sites on a protein based on stable isotope labeling and MALDI-TOF mass spectrometry. The model for this work was human serum albumin (HSA) immobilized onto silica by the Schiff base method. The immobilized HSA was digested by various proteolytic enzymes in the presence of normal water, while soluble HSA was digested in (18)O-enriched water for use as an internal standard. These two digests were mixed and analyzed, with the (18)O/(16)O ratio for each detected peptide then being measured. Several peptides in the tryptic, Lys-C, and Glu-C digests gave significantly higher (18)O/(16)O ratios than other peptides in the same digests, implying their involvement in immobilization. Analysis of these results led to identification of the N-terminus and several lysines as likely immobilization sites for HSA (e.g., K4, K41, K190, K225, K313, and K317). It was also possible from these results to quantitatively rank these sites in terms of the relative degree to which each might take part in immobilization. This method is not limited to HSA and silica but can be used with other proteins and supports.
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Affiliation(s)
| | | | - David S. Hage
- Author for correspondence. Phone: 402−472−9402; Fax: 402−472−9402; E-mail:
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Oros G, Cserháti T, Illés Z. Retention Behavior of Some Thiophosphorylglycinamide Fungicides in Adsorption and Reversed‐Phase Thin‐Layer Chromatography. J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070600758407] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Gy. Oros
- a Hungarian Academy of Sciences , Plant Protection Institute , Budapest, Hungary
| | - T. Cserháti
- b Research Institute of Materials and Environmental Chemistry , Chemical Research Center, Hungarian Academy of Sciences , Budapest, Hungary
| | - Z. Illés
- c Central European University , Budapest, Hungary
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Bai ZW, Chen L, Ching CB, Ng SC. Preparation and Enantioseparation Properties of Chiral Stationary Phases Derived from Arylcarbamoylated β‐Cyclodextrin. J LIQ CHROMATOGR R T 2007. [DOI: 10.1081/jlc-200051477] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Zheng Wu Bai
- a Chemical & Process Engineering Center , National University of Singapore , Singapore
| | - Lei Chen
- a Chemical & Process Engineering Center , National University of Singapore , Singapore
| | - Chi Bun Ching
- b Division of Chemical and Bimolecular Engineering, College of Engineering , Nanyan Technological University
| | - Siu Choon Ng
- b Division of Chemical and Bimolecular Engineering, College of Engineering , Nanyan Technological University
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Eckhardt A, Mikšík I, Charvátová J, Deyl Z, Forgács E, Cserháti T. Proteomics of Collagen Peptides: A Method to Reveal Minor Changes in Post‐Translationally Modified Collagen by HPLC and Capillary Electrophoresis. J LIQ CHROMATOGR R T 2007. [DOI: 10.1081/jlc-200058322] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Adam Eckhardt
- a Institute of Physiology, Academy of Sciences of the Czech Republic , Praha, Czech Republic
| | - Ivan Mikšík
- a Institute of Physiology, Academy of Sciences of the Czech Republic , Praha, Czech Republic
| | - Jana Charvátová
- a Institute of Physiology, Academy of Sciences of the Czech Republic , Praha, Czech Republic
| | - Zdeněk Deyl
- a Institute of Physiology, Academy of Sciences of the Czech Republic , Praha, Czech Republic
| | - Esther Forgács
- b Institute of Chemistry, Chemical Research Centre, Hungarian Academy of Sciences , Budapest, Hungary
| | - Tibor Cserháti
- b Institute of Chemistry, Chemical Research Centre, Hungarian Academy of Sciences , Budapest, Hungary
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Lämmerhofer M, Franco P, Lindner W. Quinine carbamate chiral stationary phases: Systematic optimization of steric selector-selectand binding increments and enantioselectivity by quantitative structure-enantioselectivity relationship studies. J Sep Sci 2006; 29:1486-96. [PMID: 16894794 DOI: 10.1002/jssc.200600111] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A series of quinine carbamate-based chiral stationary phases (CSPs) differing solely in the carbamate residue have been devised and a congeneric set of N-3,5-dinitrobenzoyl (DNB) amino acids (AAs) was separated into enantiomers on these CSPs by HPLC using a buffered hydro-organic mobile phase. Some details on retention and chiral recognition mechanisms have been investigated by application of quantitative structure-property relationship (QSPR) studies using the linear free energy relationship methodology, i.e., the extrathermodynamic approach. Retention factors of the high affinity enantiomer (log k2) and enantioselectivities (log alpha) were correlated with Taft's steric parameter as structural descriptor for the variability in the carbamate and AA residues, and statistically significant QSPR models could be obtained. They confirmed that the variance in the dependent variable (log k2, log alpha) is mainly associated with the steric bulkiness of the selectors' carbamate and of the AA residues. The retention factor of the second eluted enantiomers and the enantioselectivity first increased with steric bulkiness of the carbamate and AA residues, which may be explained by stronger dispersive interactions. After reaching an optimum, the dependent variable, however, declined with further increase of the steric bulkiness of the substituents, probably because of steric hindrance. The variability of the retention factors of the first eluted enantiomer could not be explained by steric descriptors. Instead, it has become obvious that the retention arises mainly from interactions of the DNB-AA and the quinine carbamate backbone, as it turned out to be more or less constant and solely to a minute amount modulated by the carbamate residue and the AA side chain. The QSPR models were fully in agreement with an earlier postulated chromatographically and spectroscopically derived hypothetical selector-selectand binding model.
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Affiliation(s)
- Michael Lämmerhofer
- Christian Doppler Laboratory for Molecular Recognition Materials, Department of Analytical Chemistry, University of Vienna, Vienna, Austria.
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Gunturi SB, Narayanan R, Khandelwal A. In silico ADME modelling 2: Computational models to predict human serum albumin binding affinity using ant colony systems. Bioorg Med Chem 2006; 14:4118-29. [PMID: 16504519 DOI: 10.1016/j.bmc.2006.02.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2005] [Revised: 01/31/2006] [Accepted: 02/01/2006] [Indexed: 11/23/2022]
Abstract
Modelling of in vitro human serum albumin (HSA) binding data of 94 diverse drugs and drug-like compounds is performed to develop global predictive models that are applicable to the whole medicinal chemistry space. For this aim, ant colony systems, a stochastic method along with multiple linear regression (MLR), is employed to exhaustively search and select multivariate linear equations, from a pool of 327 molecular descriptors. This methodology helped us to derive optimal quantitative structure-property relationship (QSPR) models based on five and six descriptors with excellent predictive power. The best five-descriptor model is based on Kier and Hall valence connectivity index--Order 5 (path), Auto-correlation descriptor (Broto-Moreau) weighted by atomic masses--Order 4, Auto-correlation descriptor (Broto-Moreau) weighted by atomic polarizabilities--Order 5, AlogP98, SklogS (calculated buffer water solubility) [R=0.8942, Q=0.86790, F=62.24 and SE=0.2626]; the best six-variable model is based on Kier and Hall valence connectivity index of Order 3 (cluster), Auto-correlation descriptor (Broto-Moreau) weighted by atomic masses--Order 4, Auto-correlation descriptor (Broto-Moreau) weighted by atomic polarizabilities--Order 5, Atomic-Level-Based AI topological descriptors--AIdsCH, AlogP98, SklogS (calculated buffer water solubility) [R=0.9128, Q=0.89220, F=64.09 and SE=0.2411]. From the analysis of the physical meaning of the selected descriptors, it is inferred that the binding affinity of small organic compounds to human serum albumin is principally dependent on the following fundamental properties: (1) hydrophobic interactions, (2) solubility, (3) size and (4) shape. Finally, as the models reported herein are based on computed properties, they appear to be a valuable tool in virtual screening, where selection and prioritisation of candidates is required.
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Affiliation(s)
- Sitarama B Gunturi
- Life Sciences R&D Division, Advanced Technology Centre, Tata Consultancy Services Limited, # 1, Software Units Layout, Madhapur, Hyderabad 500 081, India
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Del Rio A, Piras P, Roussel C. Enantiophore modeling in 3D-QSAR. A data mining application on Whelk-O1 chiral stationary phase. Chirality 2006; 18:498-508. [PMID: 16634132 DOI: 10.1002/chir.20281] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A combination of the enantiophore concept described in a previous study and a quantitative structure enantioselective relationship (QSER) based on partial least squares (PLS) analysis is presented. In the present study, a comprehensive approach for describing the enantioselective binding properties of the Whelk-O1 chiral HPLC receptor is achieved using molecular descriptors calculated by the GRID program. The GRID descriptors allow us to describe the molecules in terms of their ability to form favorable interactions with independent chemical groups (probes) that can be related to receptor sites. For each molecule, we compute 120 enantiophore descriptors representing the energy contributions from all possible pairwise combinations of probes. The overall procedure was simplified by considering only the most energetically favorable locations and converting selected grid-point energies into alignment-independent descriptors. By using a training set of 143 diverse chiral compounds, an optimal PLS model requiring seven components was chosen by using the cross-validation method resulting in a correlation coefficient R2= 0.88 and a cross validated correlation coefficient Q2= 0.85. An interpretation of the model is proposed based upon a visual inspection of the regression coefficient plots. From these plots, the influence of particular molecular features for selective binding of solutes was estimated and used to outline the chiral recognition sites in the Whelk-O1 receptor. The predictive power of our model has been estimated by means of an external data set emphasizing the suitability of the procedure also for predictive aims.
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Affiliation(s)
- Alberto Del Rio
- UMR "Chirotechnologies: Catalyse et Biocatalyse," Université "Paul Cézanne," Marseille, France
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24
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Del Rio A, Piras P, Roussel C. Data mining and enantiophore studies on chiral stationary phases used in HPLC separation. Chirality 2005; 17 Suppl:S74-83. [PMID: 15768399 DOI: 10.1002/chir.20114] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
ChirBase database has been employed to mine the chemical structures of compounds resolved on common commercial chiral stationary phases (CSP). Different data sets were produced. The molecular fingerprint (enantiophore) strategy was then applied over these data sets. Enantiophores are identified by analyzing and mapping the three-dimensional common structural features shared by the ligand molecules imported from ChirBase. Such lists of encoded ligand enantiophores allowed us to generate 3D maps of the molecular interacting fragments, which are supposed to act reciprocally with each CSP. Results show that each CSP is combined with different preferential enantiophore counterparts in the ligand. These differences may be well related to the particular behavior of a given CSP to separate different families of compounds. As expected, supramolecular cellulosic or amylosic CSPs show generalist behavior by resolving a wide range of racemates. On the other hand, molecular CSPs based on a well-defined chiral receptor (such as Whelk-O1 or Chirobiotic T) appear to be more specific and thus specially adapted for more restrictive families of compounds. In addition, enantiophore analyses confirm that the supramolecular CSPs can combine multiple potential binding sites and so offer numerous enantioselective mechanisms toward a ligand. Inversely, on molecular CSPs, the ligand must respect strict geometrical constraints to make possible the chiral discrimination. Additional applications of the methodology are discussed as well.
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Affiliation(s)
- Alberto Del Rio
- UMR Chirotechnologies: Catalyse et Biocatalyse, Université Paul Cézanne Aix-Marseille III, Marseille, France.
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25
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Forgács E, Cserháti T, Miksik I, Echardt A, Deyl Z. Simultaneous effect of organic modifier and physicochemical parameters of barbiturates on their retention on a narrow-bore PGC column. J Chromatogr B Analyt Technol Biomed Life Sci 2004; 800:259-62. [PMID: 14698263 DOI: 10.1016/j.jchromb.2003.10.050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The retention time of 22 barbituric acid derivatives was measured on a narrow-bore porous graphitized carbon (PGC) column using water-dioxane mixtures as mobile phases. The capacity factor (k), theoretical plate number (N), and asymmetry factor (AF) were calculated for each solute in each mobile phase. The relationships between chromatographic characteristics and physicochemical parameters of solutes were elucidated by stepwise regression analysis (SRA). SRA indicated that the binding of barbiturates to the PGC surface is of mixed character electrostatic and apolar interactive forces are equally involved. Sterical correspondence between the surface of the stationary phase and the solutes also exert a significant influence on the retention behavior.
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Affiliation(s)
- Esther Forgács
- Research Laboratory of Materials and Enviromental Chemistry, Chemical Research Centre, Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary.
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26
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Millot MC. Separation of drug enantiomers by liquid chromatography and capillary electrophoresis, using immobilized proteins as chiral selectors. J Chromatogr B Analyt Technol Biomed Life Sci 2003; 797:131-59. [PMID: 14630147 DOI: 10.1016/j.jchromb.2003.08.035] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Proteins display interesting chiral discrimination properties owing to multiple possibilities of intermolecular interactions with chiral compounds. This review deals with proteins which have been used as immobilized chiral selectors for the enantioseparation of drugs in liquid chromatography and capillary electrophoresis. The main procedures allowing the immobilization of proteins onto matrices, such as silica and zirconia particles, membranes and capillaries are first presented. Then the factors affecting the enantioseparation of drugs in liquid chromatography, using various protein-based chiral stationary phases (CSPs), are reviewed and discussed. Last, chiral separations already achieved using immobilized protein selectors in affinity capillary electrochromatography (ACEC) are presented and compared in terms of efficiency, stability and reproducibility.
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Affiliation(s)
- M C Millot
- Laboratoire de Recherche sur les Polymères, CNRS-Université Paris 12, UMR 7581, 2 à 8 rue Henri Dunant, Thiais 94320, France.
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27
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Zajdel P, Bojarski AJ, Byrtus H, Chłoń-Rzepa G, Obniska J, Chevallet P, Martinez J, Pawłowski M. Preliminary study on application of impregnated synthetic peptide TLC stationary phases for the pre-screening of 5-HT1A ligands. Biomed Chromatogr 2003; 17:312-7. [PMID: 12884396 DOI: 10.1002/bmc.224] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Chromatographic parameters (deltaR(f)), defined as a difference in the migration of tested compound on the control and peptide impregnated silica gel TLC plates, were determined for 42 arylpiperazine derivatives. An amino acid sequence of the peptide used for impregnation was derived from the III transmembrane segment of the 5-HT(1A) receptor in the close vicinity of aspartic acid (Asp 166) residue. It was found that the deltaR(f) values obtained in a model employing tetrapeptide P4LA (ADVL), as well as the calculated logP correlate with 5-HT(1A) receptor affinity of the studied compounds.
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Affiliation(s)
- Paweł Zajdel
- Department of Pharmaceutical Chemistry, Collegium Medicum of Jagiellonian University, 9 Medyczna St., 30-688 Kraków, Poland.
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28
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Abstract
Drug binding to Human Serum Albumin (HSA) is an area of intense research. The pharmacokinetics and pharmacodynamics of drugs are strongly affected by their binding to this protein. In this article, the field is reviewed, as well as our models to predict drug-binding affinities to HSA from drug structure. The physiological role of HSA is described, as well as its influence in drug action. The crystal structures of this protein are discussed, emphasizing the two drug-binding sites and the fatty acids binding sites observed therein. The advantages of using high-performance affinity chromatography to rapidly screen drugs for HSA binding are explained. The different QSAR models for HSA binding of restricted families of drugs (both from other groups and our group) are enumerated. Finally, a detailed description of our general models to predict drug-binding strengths to HSA from structure is given. It is expected for these models to be useful in drug design and pharmaceutical research.
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Affiliation(s)
- Gonzalo Colmenarejo
- Department of Cheminformatics, GlaxoSmithKline, Centro de Investigación Básica, Parque Tecnológico de Madrid, E-28760 Madrid, Spain.
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29
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Riboflavin binding protein—Chiral stationary phase: Investigation of retention mechanism. Chromatographia 2002. [DOI: 10.1007/bf02491778] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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30
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Shibukaw A, Yoshikawa Y, Kimura T, Kuroda Y, Nakagawa T, Wainer IW. Binding study of desethyloxybutynin using high-performance frontal analysis method. J Chromatogr B Analyt Technol Biomed Life Sci 2002; 768:189-97. [PMID: 11939552 DOI: 10.1016/s0378-4347(01)00499-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Plasma protein binding of N-desethyloxybytynin (DEOXY), a major active metabolite of oxybutynin (OXY), was investigated quantitatively and enantioselectively using high-performance frontal analysis (HPFA). An on-line HPLC system which consists of HPFA column, extraction column and analytical column was developed to determine the unbound concentrations of DEOXY enantiomers in human plasma, in human serum albumin (HSA) solutions, and in human alpha1-acid glycoprotein (AGP) solutions. DEOXY is bound in human plasma strongly and enantioselectively. The unbound drug fraction in human plasma samples containing 5 microM (R)- or (S)-DEOXY was 1.19 +/- 0.001 and 2.33 +/- 0.044%, respectively. AGP plays the dominant role in this strong and enantioselective plasma protein binding of DEOXY. The total binding affinity (nK) of (R)-DEOXY and (S)-DEOXY to AGP was 2.97 x 10(7) and 1.31 x 10(7) M(-1), respectively, while the nK values of (R)-DEOXY and (S)-DEOXY to HSA were 7.77 x 10(3) and 8.44 x 10(3) M(-1), respectively. While the nK value of (S)-DEOXY is weaker than that of (S)-OXY (1.53 x 10(7) M(-1)), the nK value of (R)-DEOXY is 4.33 times stronger than that of (R)-OXY (6.86 x I0(6) M(-1)). This suggests that the elimination of an ethyl group weakens the binding affinity of the (S)-isomer because of the decrease in hydrophobicity, while the binding affinity of the (R)-isomer is enhanced by the decrease in steric hindrance. The total binding affinity of DEOXY to HSA is much lower than that of DEOXY-AGP binding as well as OXY-HSA binding (2.64 x 10(4) and 2.19 x 10(4) M(-1) for (R)-OXY and (S)-OXY, respectively). The study on competitive binding between OXY and DEOXY indicated that DEOXY enantiomers and OXY enantiomers are all bound competitively at the same binding site of AGP molecule.
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Affiliation(s)
- Akimasa Shibukaw
- Graduate School of Pharmaceutical Sciences, Kyoto University, Japan.
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31
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Markuszewski M, Kaliszan R. Quantitative structure-retention relationships in affinity high-performance liquid chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2002; 768:55-66. [PMID: 11939558 DOI: 10.1016/s0378-4347(01)00485-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
In this report the affinity high-performance liquid chromatography data, which were determined on silica-based human serum albumin, alpha1-acid glycoprotein, keratin, collagen, melanin, amylose tris(3,5-dimethylphenylcarbamate), and basic fatty acid binding protein columns, are discussed. Using a quantitative structure-retention relationship (QSRR) approach the affinity data were interpreted in terms of structural requirements of specific binding sites on biomacromolecules. The unique chromatographic properties of immobilized artificial membrane and cholesterol stationary phases were also analyzed from the point of view of mimicking biological processes. It has been demonstrated that chemometric processing of appropriately designed sets of chromatographic data derived in systems comprising biomolecules provides information of relevance for molecular pharmacology and rational drug design.
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Affiliation(s)
- Michal Markuszewski
- Department of Biopharmaceutics and Pharmacodynamics, Medical University of Gdańsk, Poland
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32
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Andrisano V, Gotti R, Recanatini M, Cavalli A, Varoli L, Bertucci C. Stereoselective binding of 2-(4-biphenylyl)-3-substituted-3-hydroxypropionic acids on an immobilised human serum albumin chiral stationary phase. J Chromatogr B Analyt Technol Biomed Life Sci 2002; 768:137-45. [PMID: 11939547 DOI: 10.1016/s0378-4347(01)00493-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A series of 2-(4-biphenylyl)-3,3'-hydroxy-substituted phenyl propionic acid, with anti-inflammatory properties, bearing two chiral centres, were studied by HPLC upon HSA-CSP (human serum albumin-based chiral stationary phase). The compounds were analysed in their stereoisomeric erythro and threo forms. The study involved the enantioselective analysis on HSA-CSP, the determination of the racemate lipophilicity (log k'(w)), a QSRR (quantitative structure-retention relationship) analysis and CD study for the assessment of the absolute configuration of the most retained enantiomer. Lipophilicity was found to be an important factor affecting the affinity of the compounds for the HSA stationary phase, but electronic properties seemed to play a role. The position of the substituent of the phenyl group on carbon 3 was found important to modulate stereoselective interaction, the highest value of enantioselectivities being found for the erythro ortho-substituted phenyl derivatives. The previously proposed two steps mechanism of enantiodiscrimination for cyclohexylphenyl substituted derivatives was confirmed for this series of derivatives bearing the biphenylyl moiety.
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Affiliation(s)
- V Andrisano
- Dipartimento di Science Farmaceutiche, Bologna, Italy.
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33
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Hage DS. High-performance affinity chromatography: a powerful tool for studying serum protein binding. J Chromatogr B Analyt Technol Biomed Life Sci 2002; 768:3-30. [PMID: 11939555 DOI: 10.1016/s0378-4347(01)00482-0] [Citation(s) in RCA: 173] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
High-performance affinity chromatography (HPAC) is a method in which a biologically-related ligand is used as a stationary phase in an HPLC system. This approach is a powerful means for selectively isolating or quantitating agents in complex samples, but it can also be employed to study the interactions of biological systems. In recent years there have been numerous reports in which HPAC has been used to examine the interactions of drugs, hormones and other substances with serum proteins. This review discusses how HPAC has been used in such work. Particular attention is given to the techniques of zonal elution and frontal analysis. Various applications are provided for these techniques, along with a list of factors that need to be considered in their optimization and use. New approaches based on band-broadening studies and rapid immunoextraction are also discussed.
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Affiliation(s)
- David S Hage
- University of Nebraska-Lincoln, Department of Chemistry, 68588-0304, USA.
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34
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Colmenarejo G, Alvarez-Pedraglio A, Lavandera JL. Cheminformatic models to predict binding affinities to human serum albumin. J Med Chem 2001; 44:4370-8. [PMID: 11728183 DOI: 10.1021/jm010960b] [Citation(s) in RCA: 184] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Models to predict binding affinities to human serum albumin (HSA) should be very useful in the pharmaceutical industry to speed up the design of new compounds, especially as far as pharmacokinetics is concerned. We have experimentally determined through high-performance affinity chromatography the binding affinities to HSA of 95 diverse drugs and druglike compounds. These data have allowed us the derivation of quantitative structure-activity relationship models to predict binding affinities to HSA of new compounds on the basis of their structure. Simple linear, one-variable models have been derived for specific families of compounds (r(2) > or = 0.80; q(2) > or = 0.62): beta-adrenergic antagonists, steroids, COX inhibitors, and tricyclic antidepressants. Also, global models have been derived to be applicable to the whole medicinal chemical space by using the full database of HSA binding constants described above. For this aim, a genetic algorithm has been used to exhaustively search and select for multivariate and nonlinear equations, starting from a large pool of molecular descriptors. The resulting models display good fits to the experimental data (r(2) > or = 0.78; LOF < or = 0.12). In addition, both internal (cross validation and randomization) and external validation tests have demonstrated that these models have good predictive power (q(2) > or = 0.73; PRESS/SSY < or = 0.23; r(2) > or = 0.82 for the external set). Statistical analysis of the equation populations indicates that hydrophobicity (as measured by the ClogP) is the most important variable determining the binding extent to HSA. In addition, structural factors (especially the topological (6)chi(ring) index and some Jurs descriptors) also frequently appear as descriptors in the best equations. Therefore, binding to HSA turns out to be determined by a combination of hydrophobic forces together with some modulating shape factors. This agrees with X-ray structures of HSA alone or bound to ligands, where the binding pockets of both sites I and II are composed mainly of hydrophobic residues.
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Affiliation(s)
- G Colmenarejo
- Structural Chemistry Department, GlaxoSmithKline, Parque Tecnológico de Madrid, E-28760 Tres Cantos, Madrid, Spain
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35
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Baczek T, Kaliszan R. Quantitative structure/retention relationships in affinity chromatography. JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 2001; 49:83-98. [PMID: 11694274 DOI: 10.1016/s0165-022x(01)00190-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Affinity chromatography (AC) followed by quantitative structure/retention relationships (QSRR) analysis provides information on both the analytes and the macromolecules forming the stationary phases. QSRR equations derived for test series of analytes (often drugs) are interpreted in terms of structural requirements of the specific binding sites on macromolecules. Chromatographically demonstrated differences in analyte/macromolecule interactions may be relevant to molecular pharmacology and rational drug design. Multiple regression analysis of appropriately designed sets of affinity-chromatographic data may help increase the speed and efficiency of search as for new drugs and reduce the need for in vivo screening. Specific high-performance affinity-chromatographic separations can be optimized by rational selection of chiral columns, the characteristics of which are provided by QSRR.
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Affiliation(s)
- T Baczek
- Department of Biopharmaceutics and Pharmacodynamics, Medical University of Gdańsk, Gen. J. Hallera 107, 80-416 Gdańsk, Poland
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36
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Suzuki T, Timofei S, Iuoras BE, Uray G, Verdino P, Fabian WM. Quantitative structure-enantioselective retention relationships for chromatographic separation of arylalkylcarbinols on Pirkle type chiral stationary phases. J Chromatogr A 2001; 922:13-23. [PMID: 11486858 DOI: 10.1016/s0021-9673(01)00921-9] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Quantitative structure-retention (QSRR, retention factors log k1 and log k2 for the first and second eluted enantiomer) as well as enantioselective retention relationships (QSERR, separation factor log a) for a series of 42 chiral arylalkylcarbinols on four brush-type chiral stationary phases are derived by multiple linear regression analyses and artificial neuronal network calculations using 2D and 3D molecular descriptors including those obtained by quantum chemical calculations. Separation factors are in addition modeled by the 3D-QSAR method of comparative molecular field analysis (CoMFA). For the retention factors the LUMO energy turns out to be the most important descriptor, whereas for log a it is the hydrophobicity of the analytes. With CoMFA both the steric and electrostatic field are found to be of almost comparable significance.
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Affiliation(s)
- T Suzuki
- Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama, Japan
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37
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Modulation of chromatographic performances of HSA-based HPLC column by reversible binding of lithocholic acid. Chromatographia 2001. [DOI: 10.1007/bf02491614] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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