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Gong X, Chen W, Zhang K, Li T, Song Q. Serially coupled column liquid chromatography: An alternative separation tool. J Chromatogr A 2023; 1706:464278. [PMID: 37572536 DOI: 10.1016/j.chroma.2023.464278] [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: 05/30/2023] [Revised: 07/20/2023] [Accepted: 08/02/2023] [Indexed: 08/14/2023]
Abstract
Despite the rapid development of liquid chromatography (LC) in recent decades, it remains a challenge to achieve the desired chromatographic separation of complex matrices using a single column. Multi-column LC techniques, particularly serially coupled column LC (SCC-LC), have emerged as a promising solution to overcome this challenge. While more attention has been focused on heart-cutting or comprehensive two-dimensional LC, reviews specifically focusing on SCC-LC, which offers advantages in terms of precision and facile instrumentation, are scarce. Here, our concerns are devoted to the progress summary regarding the instrumentation and applications of SCC-LC. Emphasis is placed on column selection aiming to enlarge peak capacity, selectivity, or both through the optimization of combination types (e.g. RPLC-RPLC, -RPLC-HILIC, and achiral-chiral LC), connection devices (e.g. zero dead volume connector, tubing, and T-type connector), elution program (i.e. isocratic or gradient) and detectors (e.g. mass spectrometer, ultraviolet detector, and fluorescence detector). The application of SCC-LC in pharmaceutical, biological, environmental, and food fields is also reviewed, and future perspectives and potential directions for SCC-LC are discussed. We envision that the review can give meaningful information to analytical scientists when facing heavy chromatographic separation tasks for complicated matrices.
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Affiliation(s)
- Xingcheng Gong
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Wei Chen
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Ke Zhang
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Ting Li
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Qingqing Song
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China.
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2
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Tóth G, Fogarasi E, Bartalis-Fábián Á, Foroughbakhshfasaei M, Boldizsár I, Darcsi A, Lohner S, Scriba GK, Szabó ZI. Liquid chromatographic method for the simultaneous determination of achiral and chiral impurities of dapoxetine in approved and counterfeit products. J Chromatogr A 2020; 1626:461388. [DOI: 10.1016/j.chroma.2020.461388] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 06/30/2020] [Accepted: 07/03/2020] [Indexed: 02/07/2023]
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3
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Theurillat R, Sandbaumhüter FA, Gittel C, Larenza Menzies MP, Braun C, Thormann W. Enantioselective capillary electrophoresis for pharmacokinetic analysis of methadone and 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine in equines anesthetized with ketamine and isoflurane. Electrophoresis 2019; 40:1959-1965. [PMID: 30900259 DOI: 10.1002/elps.201900044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Revised: 03/18/2019] [Accepted: 03/18/2019] [Indexed: 01/30/2023]
Abstract
An enantioselective assay for the determination of methadone and its main metabolite 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine in equine plasma based on capillary electrophoresis with highly sulfated γ-cyclodextrin as chiral selector and electrokinetic analyte injection is described. The assay is based on liquid/liquid extraction of the analytes at alkaline pH from 0.1 mL plasma followed by electrokinetic sample injection of the analytes from the extract across a buffer plug without chiral selector. Separation occurs cationically at normal polarity in a pH 3 phosphate buffer containing 0.16% (w/v) of highly sulfated γ-cyclodextrin. The developed assay is precise (intra- and interday RSD < 4% and < 7%, respectively), is capable to determine enantiomer levels of methadone and 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine in plasma down to 2.5 ng/mL, and was successfully applied to monitor enantiomer drug and metabolite levels in plasma of a pony that was anesthetized with racemic ketamine and isoflurane and received a bolus of racemic methadone and a bolus followed by constant rate infusion of racemic methadone. The data suggest that the assay is well suited for pharmacokinetic purposes.
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Affiliation(s)
- Regula Theurillat
- Clinical Pharmacology Laboratory, Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Friederike A Sandbaumhüter
- Clinical Pharmacology Laboratory, Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Claudia Gittel
- Department for Horses, University of Leipzig, Leipzig, Germany
| | - M Paula Larenza Menzies
- Clinical Unit of Anaesthesiology and Perioperative Intensive-Care Medicine, Vetmeduni Vienna, Vienna, Austria
| | - Christina Braun
- Clinical Unit of Anaesthesiology and Perioperative Intensive-Care Medicine, Vetmeduni Vienna, Vienna, Austria
| | - Wolfgang Thormann
- Clinical Pharmacology Laboratory, Institute for Infectious Diseases, University of Bern, Bern, Switzerland
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4
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Hegade RS, De Beer M, Lynen F. Chiral stationary phase optimized selectivity liquid chromatography: A strategy for the separation of chiral isomers. J Chromatogr A 2017; 1515:109-117. [PMID: 28811101 DOI: 10.1016/j.chroma.2017.07.078] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 07/21/2017] [Accepted: 07/24/2017] [Indexed: 11/25/2022]
Abstract
Chiral Stationary-Phase Optimized Selectivity Liquid Chromatography (SOSLC) is proposed as a tool to optimally separate mixtures of enantiomers on a set of commercially available coupled chiral columns. This approach allows for the prediction of the separation profiles on any possible combination of the chiral stationary phases based on a limited number of preliminary analyses, followed by automated selection of the optimal column combination. Both the isocratic and gradient SOSLC approach were implemented for prediction of the retention times for a mixture of 4 chiral pairs on all possible combinations of the 5 commercial chiral columns. Predictions in isocratic and gradient mode were performed with a commercially available and with an in-house developed Microsoft visual basic algorithm, respectively. Optimal predictions in the isocratic mode required the coupling of 4 columns whereby relative deviations between the predicted and experimental retention times ranged between 2 and 7%. Gradient predictions led to the coupling of 3 chiral columns allowing baseline separation of all solutes, whereby differences between predictions and experiments ranged between 0 and 12%. The methodology is a novel tool allowing optimizing the separation of mixtures of optical isomers.
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Affiliation(s)
- Ravindra Suryakant Hegade
- Separation Science Group, Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281-S4 Bis, B-9000 Ghent, Belgium
| | | | - Frederic Lynen
- Separation Science Group, Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281-S4 Bis, B-9000 Ghent, Belgium.
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5
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Nakhla DS, Hussein LA, Magdy N, Abdallah IA, Hassan HE. Precise simultaneous quantification of methadone and cocaine in rat serum and brain tissue samples following their successive i.p. administration. J Chromatogr B Analyt Technol Biomed Life Sci 2017; 1048:19-29. [PMID: 28192759 DOI: 10.1016/j.jchromb.2017.01.048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 01/26/2017] [Accepted: 01/31/2017] [Indexed: 11/28/2022]
Abstract
A sensitive high-performance liquid chromatography (HPLC) assay with dual UV detection has been developed and validated for the simultaneous quantification of methadone and cocaine in rat serum and brain tissue samples. Liquid-liquid extraction using hexanes was applied for samples extraction with Levo-Tetrahydropalmatine (L-THP) as the internal standard. Chromatographic separation of the analytes was achieved on a reversed-phase Waters Symmetry® C18 column (150mm×4.6mm, 5μm). A gradient elution was employed with a mobile phase consisting of 5mM potassium phosphate containing 0.1% triethylamine (pH=6.5) (A) and acetonitrile (B) with a flow rate of 1mL/min. UV detection was employed at 215nm and 235nm for the determination of methadone and cocaine, respectively. The calibration curves were linear over the range of 0.05-10μg/mL for both methadone and cocaine. The assay was validated according to FDA guidelines for bioanalytical method validation and results were satisfactory and met FDA criteria. Inter-day accuracy values of serum and brain samples ranged from 96.97 to 105.59% while intra-day accuracy values ranged from 91.49 to 111.92%. Stability assays showed that both methadone and cocaine were stable during sample storage, preparation, and analytical procedures. The method was successfully used to analyze biological samples obtained from a drug- drug interaction pharmacokinetics (PK) study conducted in rats to investigate the effect of methadone on cocaine PK. Our method not only can be used for bioanalysis of samples obtained from rats but also can potentially be applied to human biological serum samples to monitor compliance to methadone maintenance therapy (MMT) and to detect possible cocaine-methadone co-abuse.
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Affiliation(s)
- David S Nakhla
- Department of Pharmaceutical Sciences, University of Maryland, School of Pharmacy, Baltimore, MD, United States; Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Misr International University, Cairo, Egypt
| | - Lobna A Hussein
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
| | - N Magdy
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
| | - Inas A Abdallah
- Department of Pharmaceutical Sciences, University of Maryland, School of Pharmacy, Baltimore, MD, United States; Department of Analytical Chemistry, Faculty of Pharmacy, University of Sadat City, Sadat City, Egypt
| | - Hazem E Hassan
- Department of Pharmaceutical Sciences, University of Maryland, School of Pharmacy, Baltimore, MD, United States; Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Helwan University, Cairo, Egypt.
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6
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Thai PK, Lai FY, Bruno R, van Dyken E, Hall W, O'Brien J, Prichard J, Mueller JF. Refining the excretion factors of methadone and codeine for wastewater analysis - Combining data from pharmacokinetic and wastewater studies. ENVIRONMENT INTERNATIONAL 2016; 94:307-314. [PMID: 27295047 DOI: 10.1016/j.envint.2016.05.033] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 05/09/2016] [Accepted: 05/31/2016] [Indexed: 06/06/2023]
Abstract
Analysing drug residues in wastewater (wastewater analysis) to monitor the consumption of those drugs in the population has become a complementary method to epidemiological surveys. In this method, the excretion factor of a drug (or the percentage of drug metabolites excreted through urine) is a critical parameter for the back-estimation of the consumption of a drug. However, this parameter is usually derived from a small database of human pharmacokinetic studies. This is true for methadone and codeine, the two most commonly used opioids and also common substances of abuse. Therefore, we aimed to refine the current excretion factors used for estimating methadone and codeine by analysing published data from the literature on the excretion of methadone, its main metabolite, 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine (EDDP), and codeine. Our review included both human drug pharmacokinetic studies and wastewater analysis studies. We found that while the commonly used excretion factor of methadone (~27.5%) was relatively accurate, the excretion factor of EDDP, a better biomarker for methadone consumption in sewer epidemiology, should be twice that of methadone (i.e. 55%) instead of the current equal or half values. For codeine, the excretion factor should be ~30% instead of 63.5% or 10% as previously used in wastewater analysis studies. Data from wastewater analysis studies could be used in this way to refine the excretion factors of the drugs of interest.
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Affiliation(s)
- Phong K Thai
- Queensland University of Technology, International Laboratory for Air Quality & Health, Brisbane, Queensland, Australia; University of Queensland, National Research Centre for Environmental Toxicology (Entox), Brisbane, Queensland, Australia.
| | - Foon Yin Lai
- University of Queensland, National Research Centre for Environmental Toxicology (Entox), Brisbane, Queensland, Australia
| | - Raimondo Bruno
- University of Tasmania, School of Psychology, Hobart, Tasmania, Australia
| | - Emma van Dyken
- University of Tasmania, Law Faculty, Hobart, Tasmania, Australia
| | - Wayne Hall
- University of Queensland, Centre for Youth Substance Abuse Research, Brisbane, Queensland, Australia
| | - Jake O'Brien
- University of Queensland, National Research Centre for Environmental Toxicology (Entox), Brisbane, Queensland, Australia
| | - Jeremy Prichard
- University of Tasmania, Law Faculty, Hobart, Tasmania, Australia
| | - Jochen F Mueller
- University of Queensland, National Research Centre for Environmental Toxicology (Entox), Brisbane, Queensland, Australia
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7
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Diastereo- and enantioseparation of a Nα-Boc amino acid with a zwitterionic quinine-based stationary phase: Focus on the stereorecognition mechanism. Anal Chim Acta 2015; 885:174-82. [DOI: 10.1016/j.aca.2015.06.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 05/27/2015] [Accepted: 06/02/2015] [Indexed: 01/09/2023]
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8
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Alipour E, Majidi MR, Hoseindokht O. Development of Simple Electrochemical Sensor for Selective Determination of Methadone in Biological Samples Using Multi-walled Carbon Nanotubes Modified Pencil Graphite Electrode. J CHIN CHEM SOC-TAIP 2015. [DOI: 10.1002/jccs.201400391] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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9
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Bouquié R, Hélène Hernando, Guillaume Deslandes, Mostefa Daho AB, Renaud C, Grall-Bronnec M, Dailly E, Jolliet P. Chiral on-line solid phase extraction coupled to liquid chromatography–tandem mass spectrometry assay for quantification of (R) and (S) enantiomers of methadone and its main metabolite in plasma. Talanta 2015; 134:373-378. [DOI: 10.1016/j.talanta.2014.11.052] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 11/17/2014] [Accepted: 11/22/2014] [Indexed: 11/28/2022]
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10
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Nielsen MKK, Johansen SS, Linnet K. Evaluation of metabolite/drug ratios in blood and urine as a tool for confirmation of a reduced tolerance in methadone-related deaths in Denmark. Drug Alcohol Depend 2013; 133:447-51. [PMID: 23891033 DOI: 10.1016/j.drugalcdep.2013.07.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 06/25/2013] [Accepted: 07/01/2013] [Indexed: 12/25/2022]
Abstract
BACKGROUND Methadone blood concentrations in fatal cases are highly variable and there is an appreciable overlap between therapeutic methadone concentrations and the concentrations detected in fatalities. As with other opioids, the background of these methadone-related deaths is unclear. The aim of this study was to investigate if short-time abstinence was contributing to the cause of death in methadone-related deaths by evaluation of the EDDP/methadone ratio in blood and urine. METHODS Samples of blood and urine were collected from 103 autopsy cases and analysed for the concentrations of methadone and its main metabolite EDDP. The cases were divided into three groups according to the cause of death: cases where methadone was the cause of death (N=67), cases where poly-drug poisoning including methadone was the cause of death (N=24) and cases where death were caused by other factors (N=12). Urine samples from 11 living persons receiving methadone were also included. RESULTS In general, a substantial overlap of the methadone concentrations in blood and urine was seen between the groups. There was a tendency of lower median EDDP/methadone urinary ratios in the methadone poisoning group (median: 1.0), poly-drug poisoning group (median: 0.94) and in the fatalities not related to methadone (median: 1.1) compared to the living subjects in methadone treatment (median: 1.6), although the differences were not significant. CONCLUSION It was not possible to reveal a possible abstinence period prior to death by using the EDDP/methadone ratio in blood and urine in methadone-related deaths.
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Affiliation(s)
- Marie K K Nielsen
- Section of Forensic Chemistry, Department of Forensic Medicine, Faculty of Health Sciences, University of Copenhagen, Frederik V's vej 11, DK-2100, Denmark.
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11
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Holm KMD, Linnet K. Chiral Analysis of Methadone and its Main Metabolite, EDDP, in Postmortem Brain and Blood by Automated SPE and Liquid Chromatography-Mass Spectrometry. J Anal Toxicol 2012; 36:487-96. [DOI: 10.1093/jat/bks057] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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12
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Assessment of chiral stationary phases for suitability for combined enantiomeric impurity/related substances assays. J Chromatogr A 2011; 1218:8655-63. [DOI: 10.1016/j.chroma.2011.09.085] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Revised: 08/25/2011] [Accepted: 09/26/2011] [Indexed: 11/20/2022]
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13
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Wang SC, Ho IK, Wu SL, Liu SC, Kuo HW, Lin KM, Liu YL. Development of a method to measure methadone enantiomers and its metabolites without enantiomer standard compounds for the plasma of methadone maintenance patients. Biomed Chromatogr 2009; 24:782-8. [DOI: 10.1002/bmc.1363] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Pérez S, Barceló D. Applications of LC-MS to quantitation and evaluation of the environmental fate of chiral drugs and their metabolites. Trends Analyt Chem 2008. [DOI: 10.1016/j.trac.2008.09.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Sardella R, Lämmerhofer M, Natalini B, Lindner W. In-line coupling of a reversed-phase column to cope with limited chemoselectivity of a quinine carbamate-based anion-exchange type chiral stationary phase. J Sep Sci 2008; 31:1702-11. [DOI: 10.1002/jssc.200800058] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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16
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Martins LF, Yegles M, Wennig R. Simultaneous enantioselective quantification of methadone and of 2-ethylidene-1,5-dimethyl-3,3-diphenyl-pyrrolidine in oral fluid using capillary electrophoresis. J Chromatogr B Analyt Technol Biomed Life Sci 2008; 862:79-85. [DOI: 10.1016/j.jchromb.2007.11.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2007] [Revised: 10/30/2007] [Accepted: 11/01/2007] [Indexed: 10/22/2022]
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17
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Samanidou VF, Anastasiadou K, Papadoyannis IN. Development and Validation of a Rapid HPLC Method for the Determination of Methadone and its Main Metabolite EDDP in Biological Fluids, Following SPE. J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070500531433] [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]
Affiliation(s)
- V. F. Samanidou
- a Laboratory of Analytical Chemistry, Department of Chemistry , Aristotle University of Thessaloniki , Thessaloniki , Greece
| | - K. Anastasiadou
- a Laboratory of Analytical Chemistry, Department of Chemistry , Aristotle University of Thessaloniki , Thessaloniki , Greece
| | - I. N. Papadoyannis
- a Laboratory of Analytical Chemistry, Department of Chemistry , Aristotle University of Thessaloniki , Thessaloniki , Greece
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18
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Villani C, Laleu B, Mobian P, Lacour J. Effective HPLC resolution of [4]heterohelicenium dyes on chiral stationary phases using reversed-phase eluents. Chirality 2007; 19:601-6. [PMID: 17096378 DOI: 10.1002/chir.20345] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
[4]Heterohelicenium cations 1a-c adopt a twisted helical structure that renders them chiral. They are configurationally stable and their enantiomers have been resolved, for the first time, by HPLC on Chiralcel OD-RH and Chirobiotic TAG chiral stationary phases (CSPs). Chiral cations 1a-c have been resolved by HPLC using water-based eluents containing KPF(6) as additive. The elution order of the analyte enantiomers was determined by on-line CD detection, and was found to be opposite on the two CSPs. The effect of mobile phase composition and analyte structure on retention and enantioselectivity was investigated.
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Affiliation(s)
- Claudio Villani
- Dipartimento di Studi di Chimica e Tecnologia delle Sostanze Biologicamente Attive, Università di Roma La Sapienza, Roma, Italy.
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Foster DJR, Morton EB, Heinkele G, Mürdter TE, Somogyi AA. Stereoselective Quantification of Methadone and a d6-labeled Isotopomer Using High Performance Liquid Chromatography-Atmospheric Pressure Chemical Ionization Mass-Spectrometry: Application to a Pharmacokinetic Study in a Methadone Maintained Subject. Ther Drug Monit 2006; 28:559-67. [PMID: 16885725 DOI: 10.1097/00007691-200608000-00012] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
There is evidence that the apparent oral clearance of rac-methadone is induced during the early phase of methadone maintenance treatment. However, it is not known if this is due to changes in bioavailability or if this phenomenon is stereoselective. This knowledge can be obtained by administering a dose of stable-labeled methadone at selected times during ongoing treatment. Therefore, the authors developed a stereoselective high performance liquid chromatography-atmospheric pressure chemical ionization mass-spectrometry assay for the quantification of the enantiomers of methadone and a d(6)-labeled isotopomer. The compounds were quantified in a single assay after liquid-liquid extraction and stereoselective high performance liquid chromatograph with atmospheric pressure chemical ionization-mass spectrometry detection. The following ions were monitored: m/z 310.15 for unlabeled methadone; m/z 316.15 for methadone-d(6); and m/z 313.15 for the methadone-d(3) (internal standard). Calibration curves ranged from 0.5 to 75 ng/mL for each compound. Extraction recovery was approximately 80% for all analytes, without evidence of differences between the unlabeled and stable-labeled compounds or concentration dependency. Minor ion promotion was observed (<15%) but this was identical for all analytes including the d(3)-labeled internal standard, with peak area ratios in extracted samples identical to control injections. The isotopomers did not alter each others' ionisation, even at 10:1 concentration ratios, and 10-fold diluted samples were within 10% of the nominal concentration. Assay performance was acceptable, with interassay and intra-assay bias and precision <10% for all compounds, including the upper and lower limits of quantitation. In conclusion, the assay was successfully applied to quantify the concentration of the methadone enantiomers of both orally administered unlabeled methadone and an intravenous 5 mg dose of methadone-d(6) in a patient receiving chronic oral methadone maintenance therapy.
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Affiliation(s)
- David J R Foster
- Department of Clinical and Experimental Pharmacology, University of Adelaide, Adelaide 5005, Australia.
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Rodriguez-Rosas ME, Medrano JG, Epstein DH, Moolchan ET, Preston KL, Wainer IW. Determination of total and free concentrations of the enantiomers of methadone and its metabolite (2-ethylidene-1,5-dimethyl-3,3-diphenyl-pyrrolidine) in human plasma by enantioselective liquid chromatography with mass spectrometric detection. J Chromatogr A 2005; 1073:237-48. [PMID: 15909525 DOI: 10.1016/j.chroma.2004.08.153] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A sensitive enantioselective liquid chromatographic assay with mass spectrometric detection (LC-MS) has been validated for the determination of total and free plasma concentrations of (R)- and (S)-methadone (Met) and (R)- and (S)-2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine (EDDP, the primary metabolite of Met), using their respective deuterium-labeled compounds as internal standards [(R,S)-d3-Met and (R,S)-d3-EDDP]. For total drug determinations, 1 ml human plasma was extracted, using a cation-exchange solid-phase extraction cartridge; the eluate was evaporated, reconstituted in the mobile phase, and injected into the LC-MS system. The free fractions of Met and EDDP were determined, using 500 microl of plasma, which were placed in an ultrafiltration device and centrifuged at 2000 x g until 250 microl of filtrate was collected. The filtrate was extracted as described above and analyzed. Enantioselective separations were achieved using an alpha1-acid glycoprotein chiral stationary phase, a mobile phase composed of acetonitrile-ammonium acetate buffer [10 mM, pH 7.0] (18:82, v/v), a flow rate of 0.9 ml/min at 25 degrees C. Under these conditions, enantioselective separations were observed for Met (alpha = 1.30) and EDDP (alpha = 1.17) within 15 min. Met, EDDP, [2H3]-Met and [2H3]-EDDP were detected using selected ion monitoring at m/z 310.30, 278.20, 313.30, and 281.20, respectively. Linear relationships between peak height ratio and drug-enantiomer concentrations were obtained for Met in the range 1.0-300.0 ng/ml, and for EDDP from 0.1 to 25.0 ng/ml with correlation coefficients greater than 0.999, where the lower limit of quantification (LLOQ) was 1 ng/ml for Met and 0.1 ng/ml for EDDP. The relative standard deviation (R.S.D.) expressed as R.S.D. for the intra- and inter-day precision of the method were < 5.3% and the R.S.D. for accuracy was < 5.0%. The method was used to analyze plasma samples obtained from patients enrolled in a Met-maintenance program.
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Affiliation(s)
- Maria Esther Rodriguez-Rosas
- Bioanalytical and Drug Discovery Unit, Gerontology Research Center, National Institute on Aging, National Institutes of Health, 5600 Nathan Shock Drive, Baltimore, MD 21224-6825, USA
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Trkulja S, Kovar KA. Definite peak identification of (R)-and (S)-methadone and (R)- and (S)-EDDP using established HPLC and CE methods. J Sep Sci 2004; 27:557-9. [PMID: 15335040 DOI: 10.1002/jssc.200301621] [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] [Indexed: 11/06/2022]
Abstract
Methadone is widely used for the treatment of opioid dependence. HPLC and CE are widespread methods for drug monitoring and metabolism studies. Although the methods are widely used for methadone and its main metabolite EDDP [1, 2], a definite direct peak identification for EDDP enantiomers is not described. This study describes a method for specific identification of each peak in the chromatogram and electropherogram of methadone analysis. The result of the study demonstrates differences in the elution order of the enantiomers of methadone and EDDP due to the technique used for analysis. The elution order of EDDP using HPLC is interchanged with respect to the order of the peaks in the electropherogram.
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Affiliation(s)
- Sandra Trkulja
- Institute of Pharmacy, Department of Pharmaceutical Analysis, University of Tuebingen, Auf der Morgenstelle 8, D-72076 Tuebingen, Germany
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22
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Srinivas NR. Simultaneous chiral analyses of multiple analytes: case studies, implications and method development considerations. Biomed Chromatogr 2004; 18:759-84. [PMID: 15584016 DOI: 10.1002/bmc.447] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The field of chiral separations had a modest beginning some two decades ago. However, due to rapid technological advancement coupled with simultaneous availability of innovative chiral stationary phases and novel chiral derivatization agents, the field of chiral separations has now totally outpaced many other separation fields. Keeping pace with rapid changes in the field of chiral separations, investigators continue to add stereoselective pharmacokinetic, pharmacodynamic, pharmacologic and toxicological data of new and/or marketed racemic compounds to the literature. Examination of the evolution of chiral separations suggests that in the beginning many investigators attempted to separate and quantify a single pair of enantiomers, adopting either direct (separation made on a chiral stationary phase) or indirect (separation made following precolumn conversion of enantiomers to corresponding diastereomers) approaches. However, more recent trends in chiral separations suggest that investigators are attempting to separate and quantify multiple pairs of enantiomers with available technologies. Added to this, some interesting trends have been observed in many of the recently reported chiral applications, including preferences regarding internal standard selection, mobile phase contents and composition, sorting out issues with mass spectrometric detection, determination of elution order, analytical manipulations of metabolite(s) without reference standards and addressing some specificity-related issues. This review mainly focuses on chiral separations involving multiple chiral analytes and attempts to justify the need for such chiral separations involving multiple analytes. In this context, several cases studies are described on the utility and applicability of such chiral separations under discrete headings to provide an account to the readership on the implications of such tasks. The topics of case studies covered in this review include: (a) therapy markers--differentiation from drug abuse and/or applicability in forensics; (b) role in pharmacogenetic/polymorphic evaluation; (c) monitoring and understanding the role of parent and active metabolite(s) in clinical and preclinical investigations; (d) exploration on the pharmacokinetic utility of an active chiral metabolite vis-a-vis the racemic parent moiety; (e) understanding the chirality play in delineating peculiar toxic effects; (f) exploration of chiral inversion phenomenon, and understanding the role of stereoselective metabolism. For the further benefit of readership, some select examples (n = 19) of the separation of multiple chiral analytes with appropriate information on chromatography, detection system, validation parameters and applicable conclusion are also provided. Finally, the review covers some useful considerations for method development involving multiple chiral analytes.
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Affiliation(s)
- Nuggehally R Srinivas
- Drug Development, Discovery Research, Dr Reddy's Laboratories, Bollaram Road, Miyapur, Hyderabad 500 049, India.
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23
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Rosas MER, Preston KL, Epstein DH, Moolchan ET, Wainer IW. Quantitative determination of the enantiomers of methadone and its metabolite (EDDP) in human saliva by enantioselective liquid chromatography with mass spectrometric detection. J Chromatogr B Analyt Technol Biomed Life Sci 2003; 796:355-70. [PMID: 14581075 DOI: 10.1016/j.jchromb.2003.08.017] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A sensitive enantioselective liquid chromatographic assay with mass spectrometric detection (LC-MS) has been developed and validated for the simultaneous determination of saliva concentrations of (R)- and (S)-methadone (Met) and (R)- and (S)-2-ethylidene-1,5-dimethyl-3,3-diphenyl-pyrrolidine (EDDP, a primary metabolite of Met). Saliva specimens were collected using Salivette devices (Sarsedt), and centrifuged; collected saliva was then spiked with deuterated internal standards, D3-Met and D3-EDDP, and directly injected into the LC-MS. Enantioselective separations were achieved on a liquid chromatographic chiral stationary phase (CSP) based upon immobilized alpha(1)-acid glycoprotein (AGP) using a mobile phase composed of acetonitrile: ammonium acetate buffer (10mM, pH 7.0) in a ratio of 18:82 (v/v), a flow rate of 0.9 ml/min and a temperature of 25 degrees C. Under these conditions, enantioselective separations were observed for methadone (alpha=1.30) and EDDP (alpha=1.17) within 15 min. Met, EDDP, D3-Met and D3-EDDP were detected using selected ion monitoring at m/z 310.20, 278.20, 313.20 and 281.20, respectively. Linear relationships between peak height ratio and drug-enantiomer concentrations were obtained for methadone in the range of 5.0-600.0 ng/ml, and for EDDP from 0.5 to 15.0 ng/ml per enantiomer with correlation coefficients better than 0.9994, where lower limit of quantification (LLOQ) for Met was 5 ng/ml and for EDDP 0.5 ng/ml. Acceptable intra- and inter-day precision of the method (CVs<4.0%) and accuracy (CVs<4.0%) were obtained. These findings demonstrate the accuracy and precision of the method used to successfully analyze saliva obtained from patients enrolled in a methadone-maintenance program.
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Affiliation(s)
- Maria Esther Rodriguez Rosas
- Bioanalytical and Drug Discovery Unit, Gerontology Research Center, National Institute on Aging, National Institutes of Health, 5600 Nathan Shock Drive, Baltimore, MD 21224-6825, USA
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24
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Foster DJ, Somogyi AA, Bochner F. Stereoselective quantification of methadone and its major oxidative metabolite, 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine, in human urine using high-performance liquid chromatography. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2000; 744:165-76. [PMID: 10985578 DOI: 10.1016/s0378-4347(00)00246-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A stereoselective HPLC assay was developed for the quantification of the enantiomers of methadone and its major oxidative metabolite, 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine (EDDP) in human urine. The compounds were quantified in a single assay following liquid-liquid extraction and stereoselective HPLC with UV detection. Calibration curve concentrations ranged from 0.125 to 12.5 microM for each enantiomer. Assay performance was assessed using quality control samples, and the inter- and intra-assay bias (<10%) and precision (<15%) were acceptable for all compounds. The assay was successfully used to quantitate the enantiomers of methadone and EDDP in urine samples obtained from subjects receiving methadone maintenance therapy.
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Affiliation(s)
- D J Foster
- Department of Clinical and Experimental Pharmacology, University of Adelaide, Australia.
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