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Roy KS, Nazdrajić E, Shimelis OI, Ross MJ, Chen Y, Cramer H, Pawliszyn J. Optimizing a High-Throughput Solid-Phase Microextraction System to Determine the Plasma Protein Binding of Drugs in Human Plasma. Anal Chem 2021; 93:11061-11065. [PMID: 34353028 DOI: 10.1021/acs.analchem.1c01986] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Plasma protein binding refers to the binding of a drug to plasma proteins after entering the body. The measurement of plasma protein binding is essential during drug development and in clinical practice, as it provides a more detailed understanding of the available free concentration of a drug in the blood, which is in turn critical for pharmacokinetics and pharmacodynamics studies. In addition, the accurate determination of the free concentration of a drug in the blood is also highly important for therapeutic drug monitoring and in personalized medicine. The present study uses C18-coated solid-phase microextraction 96-pin devices to determine the free concentrations of a set of drugs in plasma, as well as the plasma protein binding of drugs with a wide range of physicochemical properties. It should be noted that the extracted amounts used to calculate the binding constants and plasma protein bindings should be measured at respective equilibrium for plasma and phosphate buffer. Therefore, special attention is placed on properly determining the equilibration times required to correctly estimate the free concentrations of drugs in the investigated systems. The plasma protein binding values obtained with the 96-pin devices are consistent with those reported in the literature. The 96-pin device used in this research can be easily coupled with a Concept96 or other automated robotic systems to create an automated plasma protein binding determination protocol that is both more time and labor efficient compared to conventional equilibrium dialysis and ultrafiltration methods.
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Affiliation(s)
- Kanchan Sinha Roy
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
| | - Emir Nazdrajić
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
| | - Olga I Shimelis
- MilliporeSigma, 595 N. Harrison Road, Bellefonte, Pennsylvania 16823, United States
| | - M James Ross
- MilliporeSigma, 595 N. Harrison Road, Bellefonte, Pennsylvania 16823, United States
| | - Yong Chen
- MilliporeSigma, 595 N. Harrison Road, Bellefonte, Pennsylvania 16823, United States
| | - Hugh Cramer
- MilliporeSigma, 595 N. Harrison Road, Bellefonte, Pennsylvania 16823, United States
| | - Janusz Pawliszyn
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
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Jiao Q, Wang R, Jiang Y, Liu B. Study on the interaction between active components from traditional Chinese medicine and plasma proteins. Chem Cent J 2018; 12:48. [PMID: 29728878 PMCID: PMC5935606 DOI: 10.1186/s13065-018-0417-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Accepted: 04/24/2018] [Indexed: 02/06/2023] Open
Abstract
Traditional Chinese medicine (TCM), as a unique form of natural medicine, has been used in Chinese traditional therapeutic systems over two thousand years. Active components in Chinese herbal medicine are the material basis for the prevention and treatment of diseases. Research on drug-protein binding is one of the important contents in the study of early stage clinical pharmacokinetics of drugs. Plasma protein binding study has far-reaching influence on the pharmacokinetics and pharmacodynamics of drugs and helps to understand the basic rule of drug effects. It is important to study the binding characteristics of the active components in Chinese herbal medicine with plasma proteins for the medical science and modernization of TCM. This review summarizes the common analytical methods which are used to study the active herbal components-protein binding and gives the examples to illustrate their application. Rules and influence factors of the binding between different types of active herbal components and plasma proteins are summarized in the end. Finally, a suggestion on choosing the suitable technique for different types of active herbal components is provided, and the prospect of the drug-protein binding used in the area of TCM research is also discussed.
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Affiliation(s)
- Qishu Jiao
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 102488, China
| | - Rufeng Wang
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 102488, China
| | - Yanyan Jiang
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 102488, China
| | - Bin Liu
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 102488, China.
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Kamari K, Taheri A. Preparation and evaluation of magnetic core–shell mesoporous molecularly imprinted polymers for selective adsorption of amitriptyline in biological samples. J Taiwan Inst Chem Eng 2018. [DOI: 10.1016/j.jtice.2018.02.031] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Liu N, Lu X, Yang Y, Yao CX, Ning B, He D, He L, Ouyang J. Monitoring binding affinity between drug and α1-acid glycoprotein in real time by Venturi easy ambient sonic-spray ionization mass spectrometry. Talanta 2015; 143:240-244. [DOI: 10.1016/j.talanta.2015.04.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 04/14/2015] [Accepted: 04/17/2015] [Indexed: 11/30/2022]
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Gholivand MB, Piryaei M, Abolghasemi MM. Analysis of volatile oil composition of Citrus aurantium
L. by microwave-assisted extraction coupled to headspace solid-phase microextraction with nanoporous based fibers. J Sep Sci 2013; 36:872-7. [DOI: 10.1002/jssc.201200674] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2012] [Revised: 10/05/2012] [Accepted: 11/21/2012] [Indexed: 11/10/2022]
Affiliation(s)
| | - Marzieh Piryaei
- Department of Analytical Chemistry; Faculty of Chemistry; Razi University; Kermanshah Iran
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Gholivand MB, Piryaei M, Abolghasemi MM, Papzan A. Comparison of microwave-assisted headspace single-drop microextraction (MA-HS-SDME) with hydrodistillation for the determination of volatile compounds fromPrangos uloptera. JOURNAL OF ESSENTIAL OIL RESEARCH 2013. [DOI: 10.1080/10412905.2012.747267] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Gholivand MB, Piryaei M, Abolghasemi MM, Maassoumi SM. Rapid analysis of volatile components from Teucrium polium L. by nanoporous silica-polyaniline solid phase microextraction fibre. PHYTOCHEMICAL ANALYSIS : PCA 2013; 24:69-74. [PMID: 22767454 DOI: 10.1002/pca.2382] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Revised: 06/04/2012] [Accepted: 06/04/2012] [Indexed: 06/01/2023]
Abstract
INTRODUCTION The development of simple, rapid and solvent-free methods for the analysis of essential oils is highly desirable. Microwave-assisted headspace solid-phase microextraction (MA-HS-SPME) is a new sampling and concentration technique for the extraction of volatile components in medicinal plants. The main advantages of this method are the reduction of extraction time and of organic solvent. OBJECTIVE A highly porous Santa Barbara amorphous (SBA-15)/polyaniline material was prepared in order to produce a SPME fibre. The proposed fibre was evaluated for the extraction of the volatile component of Teucrium polium L. METHODOLOGY A homemade MA-HS-SPME apparatus was used for the extraction of volatile components. Highly porous SBA-15/polyaniline materials were prepared for SPME. The prepared nanomaterial was immobilized onto a stainless steel wire for fabrication of the SPME fibre. RESULTS The SBA-15/polyaniline nanonporous fibre could adsorb volatile components of T. polium efficiently. In comparison with a HD method, the proposed technique could equally monitor almost all the components of the sample, but in an easier way that was rapid and required a much lower amount of sample. CONCLUSION The experimental results showed that the nanoporous fibre was suitable for the semi-quantitative study of the composition of essential oils in plant materials and monitoring the variations in the volatile components of the plants.
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Vuignier K, Guillarme D, Veuthey JL, Carrupt PA, Schappler J. High performance affinity chromatography (HPAC) as a high-throughput screening tool in drug discovery to study drug-plasma protein interactions. J Pharm Biomed Anal 2012; 74:205-12. [PMID: 23245252 DOI: 10.1016/j.jpba.2012.10.030] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Revised: 10/22/2012] [Accepted: 10/29/2012] [Indexed: 10/27/2022]
Abstract
Drug-plasma protein binding is an important parameter that, together with other physicochemical properties such as lipophilicity and pK(a), greatly influences drug absorption, distribution, metabolism, and excretion (ADME). Therefore, it is important for pharmaceutical companies to develop a rapid screening assay to examine plasma protein binding during the early stages of the drug discovery process. Human serum albumin (HSA) and α(1)-acid glycoprotein (AGP) are the most important plasma proteins that are capable of binding drugs. In this work, an automated and high-throughput (<3 min/compound) strategy was developed using high performance affinity chromatography (HPAC) with commercial HSA and AGP columns to evaluate drug-plasma protein interactions for drug screening. A generic gradient was used throughout the study to separate drugs that were weakly and tightly bound to HSA and AGP. To accelerate the analysis time, the system was calibrated in a single run by pooling reference compounds without overloading the column. For both HSA and AGP studies, the developed methods were successfully transferred from HPAC-UV to HPAC-MS with single quadrupole MS detection and ammonium acetate, pH 7.0 as a volatile mobile phase. The MS detection enhanced the sensitivity, selectivity, and throughput of the method by pooling unknown compounds. For HSA analyses, the binding percentages obtained using HPAC were well correlated with the binding percentages from the literature. This method was also able to rank compounds based on their affinity for HSA. Concerning the AGP analyses, the quality of the correlation between the binding percentages obtained in HPAC and those from the literature was weaker. However, the method was able to classify compounds into weak, medium, and strong binders and rank compounds based on their affinity for AGP.
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Affiliation(s)
- Karine Vuignier
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, 30, Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
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Comparison of solid phase microextraction versus spectroscopic techniques for binding studies of carbamazepine. J Pharm Biomed Anal 2012; 66:91-9. [DOI: 10.1016/j.jpba.2012.03.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Revised: 03/02/2012] [Accepted: 03/06/2012] [Indexed: 11/24/2022]
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Togunde OP, Oakes KD, Servos MR, Pawliszyn J. Determination of pharmaceutical residues in fish bile by solid-phase microextraction couple with liquid chromatography-tandem mass spectrometry (LC/MS/MS). ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:5302-5309. [PMID: 22510069 DOI: 10.1021/es203758n] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The present study investigates possible uptake and bioconcentration of different classes of pharmaceuticals residues (organic contaminants) in fish bile using a simplified analytical methodology based on solid phase microextration (SPME). The use of solid phase microextraction (SPME), as a simple analytical tool, to screen for target pharmaceuticals in fish bile samples was validated in rainbow trout (Oncorhynchus mykiss) following short-term laboratory exposures to carbamazepine and fluoxetine. While fish bioconcentrated both fluoxetine and carbamazepine from exposure water, fluoxetine accumulated to a greater degree in bile than carbamazepine. Good agreement was obtained for both analytes in bile samples between SPME and traditional liquid (solvent) extraction approaches (R(2) > 0.99). The field application of SPME sampling was further demonstrated in fathead minnow (Pimephales promelas), a small-bodied fish caged upstream and downstream of a local wastewater treatment plant where fluoxetine, atorvastatin, and sertraline were detected in fish bile at the downstream location. SPME is a promising analytical tool for investigating the bioconcentration of trace contaminants in fish bile, facilitating detection of trace environmental contaminants otherwise undetectable due to low concentrations in the environment and biological tissues as well as the complexity of the sample matrices.
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Affiliation(s)
- Oluranti P Togunde
- Department of Chemistry, University of Waterloo, Ontario, N2L 3G1, Canada
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Zhang F, Xue J, Shao J, Jia L. Compilation of 222 drugs’ plasma protein binding data and guidance for study designs. Drug Discov Today 2012; 17:475-85. [DOI: 10.1016/j.drudis.2011.12.018] [Citation(s) in RCA: 142] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2011] [Revised: 10/19/2011] [Accepted: 12/15/2011] [Indexed: 01/18/2023]
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Clinical Utility of Free Drug Monitoring. Ther Drug Monit 2012. [DOI: 10.1016/b978-0-12-385467-4.00004-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Locatelli M, Governatori L, Carlucci G, Genovese S, Mollica A, Epifano F. Recent application of analytical methods to phase I and phase II drugs development: a review. Biomed Chromatogr 2011; 26:283-300. [DOI: 10.1002/bmc.1674] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Revised: 06/13/2011] [Accepted: 06/15/2011] [Indexed: 11/11/2022]
Affiliation(s)
- Marcello Locatelli
- Dipartimento di Scienze del Farmaco; Università degli Studi ‘G. D'Annunzio’ Chieti-Pescara; Via dei Vestini 31; 66100; Chieti (CH); Italy
| | - Luciana Governatori
- Dipartimento di Scienze del Farmaco; Università degli Studi ‘G. D'Annunzio’ Chieti-Pescara; Via dei Vestini 31; 66100; Chieti (CH); Italy
| | - Giuseppe Carlucci
- Dipartimento di Scienze del Farmaco; Università degli Studi ‘G. D'Annunzio’ Chieti-Pescara; Via dei Vestini 31; 66100; Chieti (CH); Italy
| | - Salvatore Genovese
- Dipartimento di Scienze del Farmaco; Università degli Studi ‘G. D'Annunzio’ Chieti-Pescara; Via dei Vestini 31; 66100; Chieti (CH); Italy
| | - Adriano Mollica
- Dipartimento di Scienze del Farmaco; Università degli Studi ‘G. D'Annunzio’ Chieti-Pescara; Via dei Vestini 31; 66100; Chieti (CH); Italy
| | - Francesco Epifano
- Dipartimento di Scienze del Farmaco; Università degli Studi ‘G. D'Annunzio’ Chieti-Pescara; Via dei Vestini 31; 66100; Chieti (CH); Italy
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Abstract
Measurement of drug concentrations in biological samples is of utmost importance in many research areas. The information about the amount of drug in a biological sample can be given as either total concentration, which ignores the interaction of the drug with the sample matrix, or as free concentration, which shows the portion of molecules able to diffuse through membranes and exert biological activity. Although the historical trend has been towards determining total concentrations, measurement of free concentrations is becoming more important since it correlates better with pharmacological and toxicological effects. This review will discuss the most popular experimental approaches for monitoring free drug concentrations, based on the type of sample to be investigated and the kind of information to be collected. It is shown that the current challenges in measuring free concentrations are: convenience, accuracy, precision, wide applicability, availability of accurate and precise reference methods, ruggedness, and standardized sample conditions.
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KATAOKA H. Current Developments and Future Trends in Solid-phase Microextraction Techniques for Pharmaceutical and Biomedical Analyses. ANAL SCI 2011; 27:893-905. [DOI: 10.2116/analsci.27.893] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Vuckovic D, Pawliszyn J. Automated study of ligand–receptor binding using solid-phase microextraction. J Pharm Biomed Anal 2009; 50:550-5. [DOI: 10.1016/j.jpba.2008.08.023] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2008] [Revised: 08/14/2008] [Accepted: 08/21/2008] [Indexed: 11/28/2022]
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Application of headspace solid phase microextraction for study of noncovalent interaction of borneol with human serum albumin. Acta Pharmacol Sin 2009; 30:1573-6. [PMID: 19890364 DOI: 10.1038/aps.2009.148] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
AIM To investigate noncovalent interactions between borneol and human serum albumin (HSA) under near-physiological conditions. METHODS A 65-microm polydimethylsiloxane (PDMS) fiber was selected for sampling. The extraction temperature was kept at 37 degrees C, and the extraction time was optimized at 10 min. Borneol solutions of different concentrations were equilibrated in 600 micromol/L HSA and 67 mmol/L phosphate buffer solution (pH 7.4, 37 degrees C) for 24 h prior to solid phase microextraction (SPME) using headspace mode. The binding properties were obtained based on the calculation of extracted borneol amount using gas chromatography (GC) determination. RESULTS The headspace SPME extraction method avoided disturbance from the HSA binding matrix. The recovery showed good linearity for the borneol concentrations over the range of 0.4-16.3 mumol/L with a regression coefficient (R(2)) of 0.9998. The limit of detection and lower limit of quantitation were determined to be 0.01 micromol/L and 0.4 micromol/L, respectively. The binding constant and the percentage binding rate were estimated to be 2.4 x 10(3)(mol/L)(-1) and 59.5%, respectively. CONCLUSION Headspace SPME coupled to GC is a simple, sensitive and rapid method for the study of borneol binding to HSA. The method may be applied in the determination of other protein binding properties in human plasma.
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Analytical methods used in conjunction with solid-phase microextraction: a review of recent bioanalytical applications. Bioanalysis 2009; 1:1081-102. [DOI: 10.4155/bio.09.88] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Integration of sampling and sample preparation with various analytical instruments is a highly desirable feature for any analytical method. This is most conveniently achieved by using microextraction techniques or various microdevices. Among these techniques, solid-phase microextraction (SPME) is particularly remarkable due to its simplicity and effectiveness. This review discusses the most recent applications of SPME in bioanalysis, grouped according to the analytical instrument that SPME is coupled to. It is shown that one of the most important aspects of such analytical methods is the ability of SPME to perform direct and selective extraction of analytes from complex biological samples. By far, the most popular method continues to be SPME coupled to GC. Nevertheless, the last 2 years have witnessed significant advances in other areas, such as successful automation of SPME coupled to liquid chromatography and the development of new coatings suitable for direct extraction from biological samples. Furthermore, a few bioanalytical applications based on direct coupling of SPME to MS, ion mobility spectrometry, CE and analytical chemiluminescence have been reported.
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Zhang Q, Huang Y, Zhao R, Liu G, Chen Y. Determining binding sites of drugs on human serum albumin using FIA-QCM. Biosens Bioelectron 2008; 24:48-54. [DOI: 10.1016/j.bios.2008.03.009] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2007] [Revised: 03/12/2008] [Accepted: 03/13/2008] [Indexed: 11/28/2022]
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Djozan D, Ebrahimi B. Preparation of new solid phase micro extraction fiber on the basis of atrazine-molecular imprinted polymer: Application for GC and GC/MS screening of triazine herbicides in water, rice and onion. Anal Chim Acta 2008; 616:152-9. [DOI: 10.1016/j.aca.2008.04.037] [Citation(s) in RCA: 133] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2008] [Revised: 04/13/2008] [Accepted: 04/15/2008] [Indexed: 10/22/2022]
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Yu Y, Yang B, Zhou T, Zhang H, Shao L, Duan G. Rapid Determination of Volatile Constituents in Safflower by Microwave Distillation and Simultaneous Solid-Phase Microextraction Coupled with Gas Chromatography-Mass Spectrometry. ACTA ACUST UNITED AC 2007; 97:1075-84. [DOI: 10.1002/adic.200790091] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Lord HL. Strategies for interfacing solid-phase microextraction with liquid chromatography. J Chromatogr A 2007; 1152:2-13. [PMID: 17178415 DOI: 10.1016/j.chroma.2006.11.073] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2006] [Revised: 11/14/2006] [Accepted: 11/14/2006] [Indexed: 11/16/2022]
Abstract
Solid-phase microextraction (SPME) techniques are equally applicable to both volatile and non-volatile analytes, but the progress in applications to gas-phase separations has outpaced that of liquid-phase separations. The interfacing of SPME to gas chromatographic equipment has been straight-forward, requiring little modification of existing equipment. The requirement of solvent desorption for non-volatile or thermally labile analytes has, however, proven challenging for interfacing SPME with liquid-phase separations. Numerous options to achieve this have been described in the literature over the past decade, with applications in several different areas of analysis. To date, no single strategy or interface device design has proven optimal. During method development analysts must select the most appropriate interfacing technique among the options available. Out of these options three general strategies have emerged: (1) use of a manual injection interface tee; (2) in-tube SPME; and (3) off-line desorption followed by conventional liquid injection. In addition, there has been interest in coupling SPME directly to electrospray ionisation and matrix-assisted laser desorption ionisation (MALDI) for mass spectrometry. Several examples of each of these strategies are reviewed here, and an overview of their use and application is presented.
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Affiliation(s)
- Heather L Lord
- Department of Pathology and Molecular Medicine, McMaster University, W. Hamilton, Ont., Canada L8N 3Z5.
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Zacharis CK, Kalaitzantonakis EA, Podgornik A, Theodoridis G. Sequential injection affinity chromatography utilizing an albumin immobilized monolithic column to study drug–protein interactions. J Chromatogr A 2007; 1144:126-34. [PMID: 17227676 DOI: 10.1016/j.chroma.2006.12.081] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2006] [Revised: 12/13/2006] [Accepted: 12/18/2006] [Indexed: 11/17/2022]
Abstract
In this study, sequential injection affinity chromatography was used for drug-protein interactions studies. The analytical system used consisted of a sequential injection analysis (SIA) manifold directly connected with convective interaction media (CIM) monolithic epoxy disks modified by ligand-immobilization of protein. A non-steroidal, anti-inflammatory drug, naproxen (NAP) and bovine serum albumin (BSA) were selected as model drug and protein, respectively. The SIA system was used for sampling, introduction and propulsion of drug towards to the monolithic column. Association equilibrium constants, binding capacity at various temperatures and thermodynamic parameters (free energy DeltaG, enthalpy DeltaH) of the binding reaction of naproxen are calculated by using frontal analysis mathematics. The variation of incubation time and its effect in on-line binding mode was also studied. The results indicated that naproxen had an association equilibrium constant of 2.90 x 10(6)M(-1) at pH 7.4 and 39 degrees C for a single binding site. The associated change in enthalpy (DeltaH) was -27.36 kcal mol(-1) and the change in entropy (DeltaS) was -73 cal mol(-1)K(-1) for a single type of binding sites. The location of the binding region was examined by competitive binding experiments using a biphosphonate drug, alendronate (ALD), as a competitor agent. It was found that the two drugs occupy the same class of binding sites on BSA. All measurements were performed with fluorescence (lambda(ext)=230 nm, lambda(em)=350 nm) and spectrophotometric detection (lambda=280 nm).
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Affiliation(s)
- Constantinos K Zacharis
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University Thessaloniki, 541 24 Thessaloniki, Greece
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Yu Y, Huang T, Yang B, Liu X, Duan G. Development of gas chromatography-mass spectrometry with microwave distillation and simultaneous solid-phase microextraction for rapid determination of volatile constituents in ginger. J Pharm Biomed Anal 2007; 43:24-31. [PMID: 16890394 DOI: 10.1016/j.jpba.2006.06.037] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2006] [Revised: 06/22/2006] [Accepted: 06/25/2006] [Indexed: 10/24/2022]
Abstract
In this study, gas chromatography-mass spectrometry (GC-MS) following microwave distillation and solid-phase microextraction (MD-SPME) was developed for the analysis of essential oil compounds in fresh ginger. In the proposed method, the isolation, extraction and concentration of volatile components in ginger were carried out in one single step, using the MD-SPME technique, and the analytes on the SPME fiber were analyzed by GC-MS. Some parameters, including SPME fiber coating, microwave power and irradiation time, were optimized. The optimal experiment parameters obtained were: 65 microm PDMS/DVB SPME fiber, a microwave power of 400 W and an irradiation time of 2 min. To demonstrate its feasibility, MD-SPME was compared with conventional SPME for the extraction of essential oil compounds in fresh ginger. Using MD-SPME followed by GC-MS, 54 compounds were separated and identified in ginger, which mainly included geranial (5.25%), zingiberene (15.48%), beta-sesquiphellandrene (5.54%) and beta-phellandrene (22.84%), whereas only 39 compounds were separated and identified by conventional SPME followed by GC-MS. The relative standard deviation (R.S.D.) values of less than 10% show that the proposed method has good repeatability. The result show that MD-SPME, followed by GC-MS, is a simple, rapid, solvent-free method for the determination of volatile compounds in ginger.
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Affiliation(s)
- Yingjia Yu
- Department of Pharmaceutical Analysis, School of Pharmacy, Fudan University, Shanghai 200032, PR China
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Trainor GL. Chapter 31 Plasma Protein Binding and the Free Drug Principle: Recent Developments and Applications. ANNUAL REPORTS IN MEDICINAL CHEMISTRY VOLUME 42 2007. [DOI: 10.1016/s0065-7743(07)42031-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Phillips TM, Wellner EF. Measurement of naproxen in human plasma by chip-based immunoaffinity capillary electrophoresis. Biomed Chromatogr 2006; 20:662-7. [PMID: 16779772 DOI: 10.1002/bmc.673] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
An electrokinetic immunoassay performed in a chip-based capillary electrophoresis system is described for the rapid measurement of naproxen in human plasma. The system employs a fluorescently labeled antibody to capture and detect the analyte of interest within a 5 min total assay time with an LOD of 0.025 microg/mL and a saturation level of 450 microg/mL. The system compared well with a conventional HPLC technique but was found to be much faster. Application of the electrokinetic assay to the study of patients with allergy to naproxen demonstrated increased concentrations of the drug extending past the predicted elimination half-life. The portability of the system and its ability to process up to 18 samples per hour makes it suitable for use in emergency room situations.
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Affiliation(s)
- Terry M Phillips
- Ultramicro Analytical Immunochemistry Resource, Division of Bioengineering and Physical Science, Office of Research Services, National Institutes of Health, Bethesda, MD 20892, USA.
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Zacharis CK, Theodoridis GA, Podgornik A, Voulgaropoulos AN. Incorporation of a monolithic column into sequential injection system for drug-protein binding studies. J Chromatogr A 2006; 1121:46-54. [PMID: 16690065 DOI: 10.1016/j.chroma.2006.04.049] [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: 01/09/2006] [Revised: 03/27/2006] [Accepted: 04/05/2006] [Indexed: 10/24/2022]
Abstract
A sequential injection analysis (SIA) manifold was incorporated with a monolithic strong anion-exchanger disk for on-line drug-protein interaction studies. The antibiotic ciprofloxacin (CF) was selected as a model drug compound. The separation principle was based on the strong retention of bovine serum albumin (BSA) on the monolithic strong anion-exchanger and the liberation/release of the free form of the drug. Elution of the retained BSA was easily achieved by delivering a different mobile phase via the SIA manifold. The type of functional group of the monolithic support, the breakthrough volume and the injected volumes of CF and BSA were studied and optimized. The influence of the variation of incubation time was studied in on-line binding assays. Scatchard plot was employed to obtain the number of binding sites and the equilibrium binding constants. For the off-line study of the CF-BSA binding, two binding classes were determined with constants of (3.16+/-0.21)x10(6)M(-1) and (1.27+/-0.48)x10(4)M(-1) and 6.1+/-1.3 and 17.8+/-3.9 binding sites per class, respectively. In non-equilibrium binding experiments the binding rate constant was k(1)=785 M(-1)min(-1). All measurements were monitored with fluorescence (lambda(ext)=300 nm, lambda(em)=460 nm) and spectrophotometric detection (lambda=280 nm). To evaluate the accuracy of the developed method the obtained results were compared versus ultrafiltration experiments and were found in good agreement.
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Affiliation(s)
- Constantinos K Zacharis
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University Thessaloniki, 541 24 Thessaloniki, Greece
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