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Erkmen C, Celik I. Interaction mechanism of a pesticide, Azoxystrobin with bovine serum albumin: Assessments through fluorescence, UV-Vis absorption, electrochemical and molecular docking simulation techniques. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 308:123719. [PMID: 38064964 DOI: 10.1016/j.saa.2023.123719] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 11/27/2023] [Accepted: 11/28/2023] [Indexed: 01/13/2024]
Abstract
The current study's objective was to investigate how an antifungal pesticide Azoxystrobin (AZO) interacts with bovine serum albumin (BSA) under conditions that simulate a physiological medium (pH 7.4). This investigation was carried out using various experimental (UV-Vis absorption, steady-state fluorescence and 3-D fluorescence spectroscopies, and electrochemical) and theoretical (molecular docking and molecular dynamics simulations) methods. The fluorescence quenching data demonstrated that AZO caused fluorescence quenching in BSA, and this quenching process was attributed to the static quenching mechanism. By examining the fluorescence quenching of BSA at three different temperatures, it was determined that the binding constants for the AZO-BSA complexes were approximately 104 M-1 in magnitude, while the same magnitude of the binding constant was found by the electrochemical method. This indicates that the interaction between AZO and BSA was of moderate strength. This was further validated by the changes observed in the UV-Vis spectrum of BSA following the addition of AZO. The thermodynamic information, including ΔH and ΔS, revealed that the interaction forces primarily involved van der Waals forces as well as hydrogen bonds. The negative Gibbs free energy indicated that the reaction is spontaneous. In the theoretical investigation, the comparison highlights a remarkable consistency in how AZO interacts with the BSA active site over various time points. Hydrogen bonding and hydrophobic interactions consistently play a role in ensuring the stable and specific binding of the ligand. Moreover, the 3-D fluorescence spectral findings revealed alterations in the surrounding microenvironment of protein fluorophores when AZO binds. Upon analyzing the electrochemical data, it was observed that there was a consistent decrease in the peak currents of AZO when BSA was added to solutions containing AZO. The primary cause of this decrease in the peak currents was the reduction in the equilibrium concentration of AZO due to the addition of BSA. Furthermore, the formation of a non-electroactive complex between BSA and AZO, which impedes electron transport between AZO and the working electrode, accounts for these decreases. As a result, it can be said that the understanding of how AZO binds to BSA offers valuable insights that can be applied in the food, human health, and environment sectors.
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Affiliation(s)
- Cem Erkmen
- Hacettepe University, Faculty of Science, Department of Chemistry, Ankara 06800, Türkiye.
| | - Ismail Celik
- Erciyes University, Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Kayseri 38039, Türkiye.
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2
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Gokavi NM, Nandibewoor ST, Gowda JI. Investigations of the Interaction Mechanism Between Orphenadrine Hydrochloride and Bovine Serum Albumin by Spectroscopic and Voltammetric Techniques. J Fluoresc 2023; 33:2061-2073. [PMID: 36976401 DOI: 10.1007/s10895-023-03199-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 03/03/2023] [Indexed: 03/29/2023]
Abstract
The interaction of orphenadrine hydrochloride (ORD) with the model protein, bovine serum albumin (BSA), was investigated using a variety of spectroscopic techniques such as steady-state fluorescence, ultraviolet-visible, Fourier transform infrared, 3-D spectroscopy, and electrochemical methods under physiological conditions. Stern-Volmer plots were used to calculate fluorescence quenching at various temperatures. The findings point to a static quenching mechanism between ORD and BSA. At various reaction times, the binding sites (n) and binding constants (K) of ORD to BSA were recorded. Thermodynamic parameters ∆H0, ∆S0 and ∆G0 between ORD and BSA were calculated and reported. The average binding distance (r) between the donor (BSA) and acceptor (ORD) molecules was predicted using Förster's theory. Three-dimensional fluorescence spectra, Fourier transform infrared spectra, and synchronous fluorescence studies all supported the alternations in protein structure following the interaction with ORD. A displacement study using site probes such as warfarin, ibuprofen, and digitoxin confirmed ORD binding at Sudlow's site I of BSA. The effect of common metal ions such as Cu2+, Ni2+, Ca2+, Co2+, and Zn2+ on binding constant values was investigated and reported.
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Affiliation(s)
- Naveen M Gokavi
- P. G. Department of Studies in Chemistry, Karnatak University, Dharwad, Karnataka, 580003, India
- Department of Chemistry, Karnatak Science College, Dharwad, Karnataka, 580001, India
| | - Sharanappa T Nandibewoor
- P. G. Department of Studies in Chemistry, Karnatak University, Dharwad, Karnataka, 580003, India
| | - Jayant I Gowda
- Department of Chemistry, BLDEA's Commerce, BHS Arts and TGP Science College, Jamkhandi, Karnataka, 587301, India.
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3
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Dohare N, Siddiquee MA, Parray MD, Kumar A, Patel R. Esterase activity and interaction of human hemoglobin with diclofenac sodium: A spectroscopic and molecular docking study. J Mol Recognit 2020; 33:e2841. [PMID: 32150309 DOI: 10.1002/jmr.2841] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 02/09/2020] [Accepted: 02/17/2020] [Indexed: 12/23/2022]
Abstract
To get an idea about the pharmacokinetics and pharmacodynamics, it is important to study the drug-protein interaction. Therefore, herein, we studied the interaction of diclofenac sodium (DIC) with human hemoglobin. The binding study of nonsteroidal antiinflammatory drug, DIC with human hemoglobin (HHB) was done by utilizing fluorescence, UV-visible, time-resolved fluorescence and far-UV circular dichroism spectroscopy (CD). Various thermodynamic parameters such as enthalpy change (ΔH), entropy change (ΔS), and Gibbs free energy change (ΔG) were also calculated. CD results showed that DIC induces secondary structure change in HHB. Fluorescence resonance energy transfer was also performed. Additionally, it was also observed that DIC inhibits the esterase-like enzymatic activity of HHB via competitive inhibition.
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Affiliation(s)
- Neeraj Dohare
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
| | - Md Abrar Siddiquee
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
| | - Mehrajud Din Parray
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
| | - Amit Kumar
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bengaluru, India
| | - Rajan Patel
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
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4
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Maurya N, Maurya JK, Kumari M, Khan AB, Dohare R, Patel R. Hydrogen bonding-assisted interaction between amitriptyline hydrochloride and hemoglobin: spectroscopic and molecular dynamics studies. J Biomol Struct Dyn 2016; 35:1367-1380. [PMID: 27141981 DOI: 10.1080/07391102.2016.1184184] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Herein, we have explored the interaction between amitriptyline hydrochloride (AMT) and hemoglobin (Hb), using steady-state and time-resolved fluorescence spectroscopy, UV-visible spectroscopy, and circular dichroism spectroscopy, in combination with molecular docking and molecular dynamic (MD) simulation methods. The steady-state fluorescence reveals the static quenching mechanism in the interaction system, which was further confirmed by UV-visible and time-resolved fluorescence spectroscopy. The binding constant, number of binding sites, and thermodynamic parameters viz. ΔG, ΔH, ΔS are also considered; result confirms that the binding of the AMT with Hb is a spontaneous process, involving hydrogen bonding and van der Waals interactions with a single binding site, as also confirmed by molecular docking study. Synchronous fluorescence, CD data, and MD simulation results contribute toward understanding the effect of AMT on Hb to interpret the conformational change in Hb upon binding in aqueous solution.
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Affiliation(s)
- Neha Maurya
- a Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia (A Central University) , New Delhi , India
| | - Jitendra Kumar Maurya
- a Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia (A Central University) , New Delhi , India
| | - Meena Kumari
- a Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia (A Central University) , New Delhi , India
| | - Abbul Bashar Khan
- a Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia (A Central University) , New Delhi , India
| | - Ravins Dohare
- b Nonlinear Dynamic Laboratory, Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia (A Central University) , New Delhi , India
| | - Rajan Patel
- a Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia (A Central University) , New Delhi , India
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5
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Tunç S, Çetinkaya A, Duman O. Spectroscopic investigations of the interactions of tramadol hydrochloride and 5-azacytidine drugs with human serum albumin and human hemoglobin proteins. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2013; 120:59-65. [DOI: 10.1016/j.jphotobiol.2013.01.011] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 01/19/2013] [Accepted: 01/23/2013] [Indexed: 11/24/2022]
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6
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Wang H, Wang Z, Lu M, Zou H. Microdialysis Sampling Method for Evaluation of Binding Kinetics of Small Molecules to Macromolecules. Anal Chem 2008; 80:2993-9. [DOI: 10.1021/ac702066x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hailin Wang
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China, and National Chromatographic Research & Analysis Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Zhixin Wang
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China, and National Chromatographic Research & Analysis Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Meiling Lu
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China, and National Chromatographic Research & Analysis Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Hanfa Zou
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China, and National Chromatographic Research & Analysis Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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SHAH A, QURESHI R, JANJUA NK, HAQUE S, AHMAD S. Electrochemical and Spectroscopic Investigations of Protonated Ferrocene-DNA Intercalation. ANAL SCI 2008; 24:1437-41. [DOI: 10.2116/analsci.24.1437] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Afzal SHAH
- Department of Chemistry, Quaid-i-Azam University
| | | | | | - Sayedul HAQUE
- Department of Animal Sciences, Quaid-i-Azam University
| | - Safeer AHMAD
- Department of Chemistry, Quaid-i-Azam University
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8
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Wen XD, Qi LW, Chen J, Song Y, Yi L, Yang XW, Li P. Analysis of interaction property of bioactive components in Danggui Buxue Decoction with protein by microdialysis coupled with HPLC–DAD–MS. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 852:598-604. [PMID: 17383242 DOI: 10.1016/j.jchromb.2007.02.041] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2006] [Revised: 01/17/2007] [Accepted: 02/18/2007] [Indexed: 10/23/2022]
Abstract
Interaction of a commonly used combined prescription of Danggui Buxue Decoction (CPDBD) with protein was studied by microdialysis coupled with HPLC-DAD-MS. Nine compounds in CPDBD were unequivocally identified by comparing with their t(R), MS data and UV spectra with those of reference compounds, and simultaneously quantified. Microdialysis recoveries and binding degrees of 20 compounds in CPDBD with bovine serum albumin (BSA) were determined. Recoveries of microdialysis sampling ranged from 66.9 to 91.5% with RSD below 3.0%, and the binding degrees of those to BSA ranged from 6.3 to 59.8% (0.3mM BSA) and from 6.9 to 86.6% (0.6mM BSA). The results were determined at pH 7.4 and the influence of different pH value was investigated. Furthermore, the binding degrees of eight reference compounds were determined separately under the same conditions, indicating a significant effect of the interaction of compounds with each other on their binding degrees to BSA. By comparing their binding degrees with BSA with those of proven active compounds in CPDBD, i.e. chlorogenic acid (3), ferulic acid (6), ononin (12) and calycosin (16), other five compounds were found to possess potential activities, which were tentatively identified as calycosin-7-O-beta-D-glucoside-6-O-malonate (9), senkyunolide I or H (10), formononetin-7-O-beta-D-glucoside-6-O-malonate (17), and two unknown compounds.
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Affiliation(s)
- Xiao-Dong Wen
- Key Laboratory of Modern Chinese Medicines, Ministry of Education and Department of Pharmacognosy, China Pharmaceutical University, No. 24 Tongjia Lane, Nanjing 210009, China
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Su X, Qin F, Kong L, Ou J, Xie C, Zou H. Characterization of enantioselective binding of racemic natural tetrahydropalmatine to DNA by chromatographic methods. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 845:174-9. [PMID: 16931189 DOI: 10.1016/j.jchromb.2006.07.050] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2006] [Revised: 07/17/2006] [Accepted: 07/26/2006] [Indexed: 11/19/2022]
Abstract
A racemate from natural product, tetrahydropalmatine (THP), was characterized on its enantioselective binding to DNA by the chromatographic methods including microdialysis/HPLC, centrifugal ultrifiltration/HPLC and immobilized DNA affinity chromatography. It was found that its (+)-enantiomer was preferential to binding on B-form duplex DNA including calf thymus DNA, AT and GC sequence oligo DNA, as well as triplex oligo DNA. The binding constants of the THP enantiomers to ct-DNA were determined with the methods of microdialysis/HPLC and frontal affinity chromatography. In addition, the DNA structural preference of either enantiomer was evaluated with the chromatographic methods.
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Affiliation(s)
- Xingye Su
- National Chromatographic R. & A. Centre, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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10
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Kim HS, Mallik R, Hage DS. Chromatographic analysis of carbamazepine binding to human serum albumin. J Chromatogr B Analyt Technol Biomed Life Sci 2006; 837:138-46. [PMID: 16687257 DOI: 10.1016/j.jchromb.2006.03.062] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2005] [Revised: 02/24/2006] [Accepted: 03/31/2006] [Indexed: 11/18/2022]
Abstract
Recent studies with carbamazepine on human serum albumin (HSA) columns have noted an appreciable degree of non-specific binding on supports prepared by the Schiff base immobilization method. This work examines an alternative immobilization method for HSA based on N-hydroxysuccinimide (NHS)-activated silica. This support was prepared by reacting HPLC-grade silica directly with disuccinimidyl carbonate. The resulting material was compared to an HSA support prepared by the Schiff base method in terms of its activity for carbamazepine and non-specific interactions with this drug. When examined by frontal analysis, both supports gave comparable association equilibrium constants for carbamazepine interactions with HSA ((0.53-0.55) x 10(4)M(-1) at 37 degrees C). However, columns prepared by the Schiff base method gave greater non-specific binding. These columns, as well as control columns prepared using the carbonyldiimidazole (CDI) immobilization method, were also evaluated for their non-specific binding to a variety of other solutes known to interact with HSA. From these results it was concluded that the NHS method was an attractive alternative to the Schiff base technique in the preparation of immobilized HSA for HPLC-based binding studies for carbamazepine. However, it was also noted that non-specific binding varies from one drug to the next in these immobilization methods, indicating that such properties should be evaluated on a case-by-case basis in the use and development of HSA columns for binding studies.
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Affiliation(s)
- Hee Seung Kim
- 704 Hamilton Hall, Chemistry Department, University of Nebraska, Lincoln, NE 68588-0304, USA
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11
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Su X, Kong L, Li X, Chen X, Guo M, Zou H. Screening and analysis of bioactive compounds with biofingerprinting chromatogram analysis of traditional Chinese medicines targeting DNA by microdialysis/HPLC. J Chromatogr A 2005; 1076:118-26. [PMID: 15974077 DOI: 10.1016/j.chroma.2005.04.031] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Biofingerprinting chromatogram analysis, which is defined as the comparison of fingerprinting chromatograms of the extract of traditional Chinese medicines (TCMs) before and after the interaction with biological systems (DNA, protein, cell, etc.), was proposed for screening and analysis of the multiple bioactive compounds in TCMs. A method of microdialysis sampling combined with high performance liquid chromatography (HPLC) was applied to the study of DNA-binding property for the extracts of TCMs. Seven compounds were found to bind to calf thymus DNA (ct-DNA) from the TCMs of Coptis chinensis Franch (Coptis), but only three ones from Phellodendron amurense Rupr. (Phellodendron) and none from Sophoraflavescens Ait. (Sophora) to bind to ct-DNA, respectively. Three of them were identified as berberine, palmatine and jatrorrhizine and their association constants (K) to ct-DNA were determined by microdialysis/HPLC. Competitive binding behaviors of them to ct-DNA were also investigated.
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Affiliation(s)
- Xingye Su
- National Chromatographic R&A Centre, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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12
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Zhang ZQ, Liang GX. Flow injection on-line oxidizing fluorometry coupled to dialysis sampling for the study of carbamazepine–protein binding. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2004.12.065] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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13
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Huang Y, Zhang Z. Binding study of drug with bovine serum album using a combined technique of microdialysis with flow-injection chemiluminescent detection. J Pharm Biomed Anal 2005; 35:1293-9. [PMID: 15336375 DOI: 10.1016/j.jpba.2004.04.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2004] [Revised: 03/30/2004] [Accepted: 04/07/2004] [Indexed: 11/20/2022]
Abstract
Microdialysis coupled with flow-injection chemiluminescence (FI-CL) has been developed to determine the binding parameters of a drug binding to protein by using antibiotic tetracycline hydrochloride binding to bovine serum albumin as a model system. The drug and protein were mixed in different molar ratios in 0.067 M phosphate buffer, pH 7.4, and incubated at 37 degrees C in a water bath. The microdialysis probe was utilized to sample the mixed solution at a perfusion rate of 5 microL/min. The concentration of unbound tetracycline hydrochloride in the microdialysate was determined by FIA-CL. In vitro recovery of tetracycline hydrochloride under experimental conditions was 30.0%. The data obtained by the present microdialysis-FI-CL system was analyzed using the Scatchard analysis and Klotz plot. The results show that the Scatchard plot and Klotz plot are linear with good correlation coefficient, indicating a good agreement of the experimental data and to the theoretical equation. The FIA chemiluminescence system combined with microdialysis developed in this work demonstrated its use for determination of interaction between drug and protein by using relatively simple instrument.
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Affiliation(s)
- Yuming Huang
- Department of Chemistry, Institute of Analytical Sciences, Southwest Normal University, No. 2, Tiansheng Road, Beibei, Chongqing 400715, PR China.
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Kim HS, Hage DS. Chromatographic analysis of carbamazepine binding to human serum albumin. J Chromatogr B Analyt Technol Biomed Life Sci 2005; 816:57-66. [PMID: 15664334 DOI: 10.1016/j.jchromb.2004.11.006] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2004] [Accepted: 11/04/2004] [Indexed: 10/26/2022]
Abstract
In this study, high-performance affinity chromatography was used to characterize the binding of carbamazepine to an immobilized human serum albumin (HSA) column. Frontal analysis was first used to determine the association equilibrium constant and binding capacity for carbamazepine on this column at various temperatures. The non-specific binding of carbamazepine within the column was also considered. The results indicated that carbamazepine had a single binding site on HSA with an association equilibrium constant of 5.3 x 10(3)M(-1) at pH 7.4 and 37 degrees C. This was confirmed through zonal elution self-competition studies. The value of DeltaG for this reaction was -5.35 kcal/mol at 37 degrees C, with an associated change in enthalpy (DeltaH) of -6.45 kcal/mol and a change in entropy (DeltaS) of -3.56 cal/molK. The location of this binding region was examined by competitive zonal elution experiments using probe compounds with known sites on HSA. It was found that carbamazepine had direct competition with l-tryptophan, a probe for the indole-benzodiazepine site of HSA, but allosteric interactions with probes for the warfarin, tamoxifen and digitoxin sites. Changes in the pH, ionic strength, and organic modifier content of the mobile phase were used to identify the predominant forces in the carbamazepine-HSA interaction.
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Affiliation(s)
- Hee Seung Kim
- Chemistry Department, University of Nebraska, Lincoln, NE 68588-0304, USA
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15
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Shi G, Xu F, Zhou H, Mao L, Jin L. Flow-injection analysis–electrochemical detection for the determination of drug–protein interactions with microdialysis sampling. Anal Chim Acta 1999. [DOI: 10.1016/s0003-2670(98)00744-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Wang H, Zou H, Zhang Y. Multi-site binding of fenoprofen to human serum albumin studied by a combined technique of microdialysis with high performance liquid chromatography. Biomed Chromatogr 1998; 12:4-7. [PMID: 9470966 DOI: 10.1002/(sici)1099-0801(199801/02)12:1<4::aid-bmc707>3.0.co;2-k] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A simple and fast method for the determination of the multi-site binding of fenoprofen (FP) to human serum albumin (HSA) has been developed by utilizing microdialysis sampling techniques combined with high performance liquid chromatography (HPLC). The drug and protein were mixed in different molar ratios in 0.067 Mol potassium phosphate buffer, pH 7.4, and incubated at 37 degrees C in a water-bath. Then the microdialysis probe was put in the FP-HSA solution and sampled at the perfusion rate of 1 microL/min. The concentrations of FP in microdialysates were determined by the reversed-phase high performance liquid chromatography. Relative recovery (R) was also determined in vitro on similar condition, R is about 56.03 +/- 1.11% (n = 3). Fenoprofen was found to bind to two classes of sites, the association constant (K1) and the number of the binding sites on primary binding sites of a HSA molecule (n1) for fenoprofen are 3.4 x 10(5)/M and 2.5, respectively, and those for secondary binding are 1.0 x 10(4)/M and 10.0, respectively. The competitive interaction of ibuprofen (IP) and palmitic acid with fenoprofen to HSA were also studied, both compounds significantly decrease the binding degree of fenoprofen to HSA.
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Affiliation(s)
- H Wang
- National Chromatographic R. & A. Centre, Dalian Institute of Chemical Physics, Academia Sinica, Dalian, Peoples Republic of China
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17
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Microdialysis- liquid chromatographic study on competitive binding of drugs to protein. ACTA ACUST UNITED AC 1997. [DOI: 10.1007/bf02875483] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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