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Kokilambigai KS, Irina VM, Sheba Mariam KC, Adila K, Kathirvel S. Comprehensive overview of analytical and bioanalytical methodologies for the opioid analgesics - Tramadol and combinations. Anal Biochem 2024; 692:115579. [PMID: 38797485 DOI: 10.1016/j.ab.2024.115579] [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: 01/03/2024] [Revised: 05/09/2024] [Accepted: 05/23/2024] [Indexed: 05/29/2024]
Abstract
Synthetic opioids like Tramadol are used to treat mild to moderate pain. Its ability to relieve pain is about a tenth that of morphine. Furthermore, Tramadol shares similar effects on serotonin and norepinephrine to several antidepressants known as serotonin-norepinephrine reuptake inhibitors (SNRIs), such as venlafaxine and duloxetine. The present review paper discusses the recent developments in analytical methods for identifying drugs in pharmaceutical preparations and toxicological materials, such as blood, saliva, urine, and hair. In recent years, a wide variety of analytical instruments, including capillary electrophoresis, NMR, UV-visible spectroscopy, HPTLC, HPLC, LC-MS, GC, GC-MS, and electrochemical sensors, have been used for drug identification in pharmaceutical preparations and toxicological samples. The primary quantification techniques currently employed for its quantification in various matrices are highlighted in this research.
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Affiliation(s)
- K S Kokilambigai
- Department of Pharmaceutical Analysis, SRM College of Pharmacy, SRM Institute of Science and Technology, Kattankulathur 603203, Chengalpattu District, Tamil Nadu, India
| | - V M Irina
- Dr. Moopen's College of Pharmacy, Naseera Nagar, Meppadi PO, Wayanad, 673577, Kerala, India
| | - K C Sheba Mariam
- Department of Pharmaceutical Analysis, National College of Pharmacy, Manassery, Mukkam Post., Kozhikode, 673602, Kerala, India
| | - K Adila
- Department of Pharmaceutical Analysis, National College of Pharmacy, Manassery, Mukkam Post., Kozhikode, 673602, Kerala, India
| | - S Kathirvel
- Department of Pharmaceutical Analysis, National College of Pharmacy, Manassery, Mukkam Post., Kozhikode, 673602, Kerala, India.
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Hilal MA, Mohamed KM. Simultaneous determination of tramadol and O-desmethyltramadol in human plasma using HPLC-DAD. J Chromatogr Sci 2013; 52:1186-92. [PMID: 24297526 DOI: 10.1093/chromsci/bmt174] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A sensitive and accurate method for the extraction and quantification of tramadol (T) and its active metabolite, O-desmethyltramadol (ODT) in human plasma with high-performance liquid chromatography-diode array detection was developed and validated. The analytes were extracted from plasma samples by tert-butylmethyl ether in the presence of ammonium hydroxide as alkaline medium and back extraction with 1.0 M hydrochloric acid. Propranolol was used as internal standard. The extraction efficiencies of T and ODT were 83.51 and 78.72%, respectively. The calibration curves were linear (r(2) > 0.99) in the concentration range of 250-2000 ng/mL for T and ODT. Limits of detection and quantification were 125 and 250 ng/mL for both analytes. Intra- and interassay precision for T and ODT were ranged from 1.89 to 10.91% and 2.16 to 5.85%, respectively. Intra- and interassay accuracy for T and ODT were ranged from -13.07 to 4.99% and -2.03 to -6.98%, respectively. The method was successfully applied to quantify T and ODT from authentic plasma samples received from Hospital Sohag University. The method was completely validated and can be of interest to clinical and forensic laboratories.
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Affiliation(s)
- Maha A Hilal
- Forensic Medicine and Clinical Toxicology Department, Faculty of Medicine, Sohag University, Sohag, Egypt
| | - Khaled M Mohamed
- Assiut Chemical Laboratory, Medico-Legal Department, Ministry of Justice, Justice, Egypt
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Tyrkkö E, Pelander A, Ketola RA, Ojanperä I. In silico and in vitro metabolism studies support identification of designer drugs in human urine by liquid chromatography/quadrupole-time-of-flight mass spectrometry. Anal Bioanal Chem 2013; 405:6697-709. [PMID: 23797910 DOI: 10.1007/s00216-013-7137-1] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 06/07/2013] [Accepted: 06/10/2013] [Indexed: 01/21/2023]
Abstract
Human phase I metabolism of four designer drugs, 2-desoxypipradrol (2-DPMP), 3,4-dimethylmethcathinone (3,4-DMMC), α-pyrrolidinovalerophenone (α-PVP), and methiopropamine (MPA), was studied using in silico and in vitro metabolite prediction. The metabolites were identified in drug abusers’ urine samples using liquid chromatography/quadrupole-time-of-flight mass spectrometry (LC/Q-TOF/MS). The aim of the study was to evaluate the ability of the in silico and in vitro methods to generate the main urinary metabolites found in vivo. Meteor 14.0.0 software (Lhasa Limited) was used for in silico metabolite prediction, and in vitro metabolites were produced in human liver microsomes (HLMs). 2-DPMP was metabolized by hydroxylation, dehydrogenation, and oxidation, resulting in six phase I metabolites. Six metabolites were identified for 3,4-DMMC formed via N-demethylation, reduction, hydroxylation, and oxidation reactions. α-PVP was found to undergo reduction, hydroxylation, dehydrogenation, and oxidation reactions, as well as degradation of the pyrrolidine ring, and seven phase I metabolites were identified. For MPA, the nor-MPA metabolite was detected. Meteor software predicted the main human urinary phase I metabolites of 3,4-DMMC, α-PVP, and MPA and two of the four main metabolites of 2-DPMP. It assisted in the identification of the previously unreported metabolic reactions for α-PVP. Eight of the 12 most abundant in vivo phase I metabolites were detected in the in vitro HLM experiments. In vitro tests serve as material for exploitation of in silico data when an authentic urine sample is not available. In silico and in vitro designer drug metabolism studies with LC/Q-TOF/MS produced sufficient metabolic information to support identification of the parent compound in vivo.
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Affiliation(s)
- Elli Tyrkkö
- Department of Forensic Medicine, Hjelt Institute, University of Helsinki, P.O. Box 40, 00014 Helsinki, Finland.
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El-Sayed AAY, Mohamed KM, Nasser AY, Button J, Holt DW. Simultaneous determination of tramadol, O-desmethyltramadol and N-desmethyltramadol in human urine by gas chromatography–mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2013; 926:9-15. [DOI: 10.1016/j.jchromb.2013.02.019] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Revised: 02/11/2013] [Accepted: 02/19/2013] [Indexed: 11/26/2022]
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Coller JK, Michalakas JR, James HM, Farquharson AL, Colvill J, White JM, Somogyi AA. Inhibition of CYP2D6-mediated tramadol O-demethylation in methadone but not buprenorphine maintenance patients. Br J Clin Pharmacol 2013; 74:835-41. [PMID: 22369095 DOI: 10.1111/j.1365-2125.2012.04256.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
WHAT IS ALREADY KNOWN ABOUT THIS SUBJECT Management of pain in opioid dependent individuals is problematic due to numerous issues including cross-tolerance to opioids. Hence there is a need to find alternative analgesics to classical opioids and tramadol is potentially one such alternative. Methadone inhibits CYP2D6 in vivo and in vitro. We aimed to investigate the effect of methadone on the pathways of tramadol metabolism: O-demethylation (CYP2D6) to the opioid-active metabolite M1 and N-demethylation (CYP3A4) to M2 in subjects maintained on methadone or buprenorphine as a control. WHAT THIS STUDY ADDS Compared with subjects on buprenorphine, methadone reduced the clearance of tramadol to active O-desmethyl-tramadol (M1) but had no effect on N-desmethyltramadol (M2) formation. Similar to other analgesics whose active metabolites are formed by CYP2D6 such as codeine, reduced formation of O-desmethyltramadol (M1) is likely to result in reduced analgesia for subjects maintained on methadone. Hence alternative analgesics whose metabolism is independent of CYP2D6 should be utilized in this patient population. AIMS To compare the O- (CYP2D6 mediated) and N- (CYP3A4 mediated) demethylation metabolism of tramadol between methadone and buprenorphine maintained CYP2D6 extensive metabolizer subjects. METHODS Nine methadone and seven buprenorphine maintained subjects received a single 100 mg dose of tramadol hydrochloride. Blood was collected at 4 h and assayed for tramadol, methadone, buprenorphine and norbuprenorphine (where appropriate) and all urine over 4 h was assayed for tramadol and its M1 and M2 metabolites. RESULTS The urinary metabolic ratio [median (range)] for O-demethylation (M1) was significantly lower (P= 0.0002, probability score 1.0) in the subjects taking methadone [0.071 (0.012-0.103)] compared with those taking buprenorphine [0.192 (0.108-0.392)], but there was no significant difference (P= 0.21, probability score 0.69) in N-demethylation (M2). The percentage of dose [median (range)] recovered as M1 was significantly lower in subjects taking methadone compared with buprenorphine (0.069 (0.044-0.093) and 0.126 (0.069-0.187), respectively, P= 0.04, probability score 0.19), M2 was significantly higher in subjects taking methadone compared with buprenorphine (0.048 (0.033-0.085) and 0.033 (0.014-0.049), respectively, P= 0.04, probability score 0.81). Tramadol was similar (0.901 (0.635-1.30) and 0.685 (0.347-1.04), respectively, P= 0.35, probability score 0.65). CONCLUSIONS Methadone inhibited the CYP2D6-mediated metabolism of tramadol to M1. Hence, as the degree of opioid analgesia is largely dependent on M1 formation, methadone maintenance patients may not receive adequate analgesia from oral tramadol.
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Affiliation(s)
- Janet K Coller
- Discipline of Pharmacology, School of Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia.
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Smyj R, Wang XP, Han F. Tramadol hydrochloride. PROFILES OF DRUG SUBSTANCES, EXCIPIENTS, AND RELATED METHODOLOGY 2013; 38:463-494. [PMID: 23668411 DOI: 10.1016/b978-0-12-407691-4.00011-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A profile of the analgesic tramadol hydrochloride ((1RS,2RS)-2-[(dimethylamino)methyl]-1-(3-methoxyphenyl)cyclohexanol hydrochloride) is provided in this chapter and includes a summary of the physical characteristics known for this drug substance (e.g., UV/vis, IR, NMR, and mass spectra). Details regarding the stability of tramadol hydrochloride in the solid state and solution-phase are presented and methods of analysis (compendial and literature) are summarized. Furthermore, an account of biological properties and a description of the chemical synthesis of tramadol hydrochloride are given.
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Nossaman VE, Ramadhyani U, Kadowitz PJ, Nossaman BD. Advances in perioperative pain management: use of medications with dual analgesic mechanisms, tramadol & tapentadol. Anesthesiol Clin 2010; 28:647-666. [PMID: 21074743 DOI: 10.1016/j.anclin.2010.08.009] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Recovery from ambulatory surgical procedures can be limited by postoperative pain. Inadequate analgesia may delay or prevent patient discharge and can result in readmission. More frequently, postoperative pain produces discomfort and interrupts sleep, contributing to postoperative fatigue. The development of effective analgesic regimens for the management of postoperative pain is a priority especially in patients with impaired cardiorespiratory, hepatic, or renal function. Tramadol and tapentadol hydrochloride are novel in that their analgesic actions occur at multiple sites. Both agents are reported to be mu-opioid receptor agonists and monoamine-reuptake inhibitors. In contrast to pure opioid agonists, both drugs are believed to have lower risks of respiratory depression, tolerance, and dependence. The Food and Drug Administration has approved both drugs for the treatment of moderate-to-severe acute pain in adults. This article provides an evidence-based account of the role of tramadol and tapentadol in modern clinical practice.
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Affiliation(s)
- Vaughn E Nossaman
- Department of Pharmacology, Tulane University Medical Center, 1430 Tulane Avenue, New Orleans, LA 70129, USA.
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Yarbrough J, Greenacre C, Souza M, Cox S. LC Determination of Tramadol, M1, M2, M4, and M5 in Plasma. Chromatographia 2009. [DOI: 10.1365/s10337-009-1451-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Elghazali M, Barezaik IM, Abdel Hadi AA, Eltayeb FM, Al Masri J, Wasfi IA. The pharmacokinetics, metabolism and urinary detection time of tramadol in camels. Vet J 2008; 178:272-7. [PMID: 17904881 DOI: 10.1016/j.tvjl.2007.07.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2007] [Revised: 07/03/2007] [Accepted: 07/05/2007] [Indexed: 11/25/2022]
Abstract
The pharmacokinetics of tramadol in camels (Camelus dromedarius) were studied following a single intravenous (IV) and a single intramuscular (IM) dose of 2.33 mg kg(-1) bodyweight. The drug's metabolism and urinary detection time were also investigated. Following both IV and IM administration, tramadol was extracted from plasma using an automated solid phase extraction method and the concentration measured by gas chromatography-mass spectrometry (GC/MS). The plasma drug concentrations after IV administration were best fitted by an open two-compartment model. However a three-compartment open model best fitted the IM data. The results (means+/-SEM) were as follows: after IV drug administration, the distribution half-life (t(1/2)(alpha)) was 0.22+/-0.05 h, the elimination half-life (t(1/2)(beta)) 1.33+/-0.18 h, the total body clearance (Cl(T)) 1.94+/-0.18 L h kg(-1), the volume of distribution at steady state (Vd(ss)) 2.58+/-0.44 L kg(-1), and the area under the concentration vs. time curve (AUC(0-infinity)) 1.25+/-0.13 mg h L(-1). Following IM administration, the maximal plasma tramadol concentration (C(max)) reached was 0.44+/-0.07 microg mL(-1) at time (T(max)) 0.57+/-0.11h; the absorption half-life (t(1/2 ka)) was 0.17+/-0.03 h, the (t(1/2)(beta)) was 3.24+/-0.55 h, the (AUC(0-infinity)) was 1.27+/-0.12 mg h L(-1), the (Vd(area)) was 8.94+/-1.41 L kg(-1), and the mean systemic bioavailability (F) was 101.62%. Three main tramadol metabolites were detected in urine. These were O-desmethyltramadol, N,O-desmethyltramadol and/or N-bis-desmethyltramadol, and hydroxy-tramadol. O-Desmethyltramadol was found to be the main metabolite. The urinary detection times for tramadol and O-desmethyltramadol were 24 and 48 h, respectively. The pharmacokinetics of tramadol in camels was characterised by a fast clearance, large volume of distribution and brief half-life, which resulted in a short detection time. O-Desmethyltramadol detection in positive cases would increase the reliability of reporting tramadol abuse.
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Affiliation(s)
- M Elghazali
- Camel Racing Forensic Laboratory, Forensic Science Laboratory, P.O. Box 253, Abu Dhabi, United Arab Emirates.
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Thomas AB, Dumbre NG, Nanda RK, Kothapalli LP, Chaudhari AA, Deshpande AD. Simultaneous Determination of Tramadol and Ibuprofen in Pharmaceutical Preparations by First Order Derivative Spectrophotometric and LC Methods. Chromatographia 2008. [DOI: 10.1365/s10337-008-0762-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Kartinasari WF, Palupi T, Indrayanto G. HPLC Determination and Validation of Tramadol Hydrochloride in Capsules. J LIQ CHROMATOGR R T 2007. [DOI: 10.1081/jlc-120028261] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Wiwin Farina Kartinasari
- a Quality Control Laboratory , Bernofarm Pharmaceutical Company , Buduran, Sidoarjo, Surabaya , Indonesia
| | - Tini Palupi
- a Quality Control Laboratory , Bernofarm Pharmaceutical Company , Buduran, Sidoarjo, Surabaya , Indonesia
| | - Gunawan Indrayanto
- b Department of Natural Products, Faculty of Pharmacy , Airlangga State University , Jl. Dharmawangsa dalam, Surabaya , 60286 , Indonesia
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Rouini MR, Ardakani YH, Soltani F, Aboul-Enein HY, Foroumadi A. Development and validation of a rapid HPLC method for simultaneous determination of tramadol, and its two main metabolites in human plasma. J Chromatogr B Analyt Technol Biomed Life Sci 2005; 830:207-11. [PMID: 16280260 DOI: 10.1016/j.jchromb.2005.10.039] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2005] [Revised: 10/24/2005] [Accepted: 10/26/2005] [Indexed: 11/17/2022]
Abstract
Tramadol, an analgesic agent, and its two main metabolites O-desmethyltramadol (M1) and N-desmethyltramadol (M2) were determined simultaneously in human plasma by a rapid and specific HPLC method. The sample preparation was a simple extraction with ethyl acetate. Chromatographic separation was achieved with a Chromolith Performance RP-18e 50 mm x 4.6 mm column, using a mixture of methanol:water (13:87, v/v) adjusted to pH 2.5 by phosphoric acid, in an isocratic mode at flow rate of 2 ml/min. Fluorescence detection (lambda(ex)=200 nm/lambda(em)=301 nm) was used. The calibration curves were linear (r(2)>0.997) in the concentration range of 2.5-500 ng/ml, 1.25-500 ng/ml and 5-500 ng/ml for tramadol, M1 and M2, respectively. The lower limit of quantification was 2.5 ng/ml for tramadol, 1.25 ng/ml for M1 and 5 ng/ml for M2. The within- and between-day precisions in the measurement of QC samples at four tested concentrations were in the range of 2.5-9.7%, 2.5-9.9% and 5.9-11.3% for tramadol, M1 and M2, respectively. The developed procedure was applied to assess the pharmacokinetics of tramadol and its two main metabolites following administration of 100mg single oral dose of tramadol to healthy volunteers.
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Affiliation(s)
- Mohammad-Reza Rouini
- Biopharmaceutics and Pharmacokinetics Division, Department of Pharmaceutics, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 14155-6451, Iran
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Allegaert K, de Hoon J, Verbesselt R, Devlieger H, Tibboel D. Tramadol concentrations in blood and in cerebrospinal fluid in a neonate. Eur J Clin Pharmacol 2005; 60:911-3. [PMID: 15662507 DOI: 10.1007/s00228-004-0872-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2004] [Accepted: 11/17/2004] [Indexed: 10/25/2022]
Abstract
Based on blood and cerebrospinal fluid samples collected in a full-term neonate, the penetration of tramadol in the central nervous system is described. Following intravenous administration of tramadol, a lag time of about 4 h was observed until full blood-brain equilibration was achieved. This pharmacokinetic observation is in line with a recent pharmacodynamic evaluation of the central opioid effects of tramadol in adults.
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Affiliation(s)
- K Allegaert
- Department of Paediatrics, University Hospital, Gasthuisberg, Herestraat, Leuven, Belgium.
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Lehtonen P, Siren H, Ojanperä I, Kostiainen R. Migration behaviour and separation of tramadol metabolites and diastereomeric separation of tramadol glucuronides by capillary electrophoresis. J Chromatogr A 2004; 1041:227-34. [PMID: 15281273 DOI: 10.1016/j.chroma.2004.04.031] [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] [Indexed: 11/18/2022]
Abstract
Capillary electrophoresis with UV detection was used to separate tramadol (TR), a centrally acting analgesic, and its five phase I (M1, M2, M3, M4, M5) and three phase II metabolites (glucuronides of M1, M4 and M5). Several factors were evaluated in optimisation of the separation: pH and composition of the background electrolyte and the influence of a micellar modifier, sodium dodecyl sulfate. Baseline separation of TR and all the analytes was obtained with use of 65 mM tetraborate electrolyte solution at pH 10.65. The lowest concentrations of the analytes that could be detected were below 1 microM for the O-methylated, below 2 microM for the phenolic and ca. 7 microM for the glucuronide metabolites. The suitability of the method for screening of real samples was tested with an authentic urine sample collected after a single oral dose (50 mg) of TR. After purification and five-fold concentration of the sample (solid-phase extraction with Oasis MCX cartridges), the parent drug TR and its metabolites M1, M1G, M5 and M5G were easily detected, in comparison with standards, in an interference-free area of the electropherogram. Diastereomeric separation of TR glucuronides in in vitro samples was achieved with 10 mM ammonium acetate-100 mM formic acid electrolyte solution at pH 2.75 and with basic micellar 25 mM tetraborate-70 mM SDS electrolyte solution at pH 10.45. Both separations showed that glucuronidation in vitro produces glucuronide diastereomers in different amounts. The authentic TR urine sample was also analysed by micellar method, but unambiguous identification of the glucuronide diastereomers was not achieved owing to many interferences.
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Affiliation(s)
- Päivi Lehtonen
- Faculty of Pharmacy, Division of Pharmaceutical Chemistry, University of Helsinki, P.O. Box 56, Helsinki FIN-00014, Finland.
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Zwaveling J, Bubbers S, van Meurs AHJ, Schoemaker RC, van Heel IRD, Vermeij P, Burggraaf J. Pharmacokinetics of rectal tramadol in postoperative paediatric patients. Br J Anaesth 2004; 93:224-7. [PMID: 15169737 DOI: 10.1093/bja/aeh178] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Postoperative analgesia in children may be improved by using tramadol. The pharmacokinetics of rectal tramadol in young children were therefore investigated. METHODS The pharmacokinetics of rectal tramadol and its active metabolite were studied in 12 young children (age: 1-6 yr) postoperatively. On the basis of these data, a population model was constructed. Using this model, the pharmacokinetics of different doses of tramadol were calculated. RESULTS The pharmacokinetics of rectal tramadol could be adequately described by a one-compartment model. The pharmacokinetic parameters derived from the model indicate that a low variability was present. Elimination half-life was 4.3 (0.2) h (sem) and the apparent clearance was 16.4 (1.5) litre h(-1) (sem). CONCLUSIONS The study showed that after rectal administration, tramadol is absorbed at a reasonable rate and with a low inter-individual variability in small children. The data also suggested that a rectal dose of tramadol 1.5-2.0 mg kg(-1) is therapeutic.
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Affiliation(s)
- J Zwaveling
- Department of Clinical Pharmacy and Toxicology of the Leiden University Medical Center, Leiden, The Netherlands.
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Meyyanathan SN, Kumar P, Suresh B. Analysis of tramadol in pharmaceutical preparations by high performance thin layer chromatography. J Sep Sci 2003. [DOI: 10.1002/jssc.200301541] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Enantioselective HPLC method for quantitative determination of tramadol andO-desmethyltramadol in plasma and urine: Application to clinical studies. Chromatographia 2003. [DOI: 10.1007/bf02492397] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Tao Q, Stone DJ, Borenstein MR, Codd EE, Coogan TP, Desai-Krieger D, Liao S, Raffa RB. Differential tramadol and O-desmethyl metabolite levels in brain vs. plasma of mice and rats administered tramadol hydrochloride orally. J Clin Pharm Ther 2002; 27:99-106. [PMID: 11975693 DOI: 10.1046/j.1365-2710.2002.00384.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To investigate a possible differential brain uptake of tramadol vs. its major metabolite (O-desmethyl tramadol; M1) in mice and rats. METHODS An extraction and measurement technique (gas chromatograph equipped with a nitrogen phosphorus detector) was used to measure plasma and brain levels of tramadol and M1 at intervals 10-300 min after oral dosing of tramadol hydrochloride to mice and rats. RESULTS For all doses of tramadol administered (5, 10, 20, or 40 mg/kg), tramadol and M1 plasma levels were greatest 10 min after dosing: in mice, peak tramadol plasma levels were 47.75-736.72 ng/mL and peak M1 levels were 75.30-1084.92 ng/mL; in rats, peak tramadol plasma levels were 185.03-455.81 ng/mL and peak M1 levels were 106.74-455.70 ng/mL. Tramadol brain levels were also greatest 10 min after dosing. In mice, peak tramadol brain levels were 226.42-1847.46 ng/g. Peak M1 levels (72.17-572.97 ng/g) occurred 20-60 min after dosing. In rats, peak tramadol brain levels were 258.50-1777.37 ng/g and peak M1 levels were 80.35-289.60 ng/g. In mice, the ratio of tramadol/M1 in plasma was 0.5-1.0 throughout the measurements, whereas the ratio in brain was about 10 at 10 min and about 2 from 20 to 50 min. In rats, the ratio of tramadol/M1 in plasma was 0.5-1.5, whereas the ratio in brain was about 15 at 10 min and about 4-7 thereafter. CONCLUSION In mice and rats, there appears to be preferential brain vs. plasma distribution of tramadol over M1.
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Affiliation(s)
- Q Tao
- Temple University School of Pharmacy, Philadelphia, PA 19140, USA
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Nobilis M, Kopecký J, Kvetina J, Chládek J, Svoboda Z, Vorísek V, Perlík F, Pour M, Kunes J. High-performance liquid chromatographic determination of tramadol and its O-desmethylated metabolite in blood plasma. Application to a bioequivalence study in humans. J Chromatogr A 2002; 949:11-22. [PMID: 11999728 DOI: 10.1016/s0021-9673(01)01567-9] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Simultaneous HPLC determination of the analgetic agent tramadol, its major pharmacodynamically active metabolite (O-desmethyltramadol) in human plasma is described. Simple methods for the preparation of the standard of the above-mentioned tramadol metabolite and N1,N1-dimethylsulfanilamide (used as the internal standard) are also presented. The analytical procedure involved a simple liquid-liquid extraction of the analytes from the plasma under the conditions described previously. HPLC analysis was performed on a 250x4 mm chromatographic column with LiChrospher 60 RP-selectB 5-microm (Merck) and consists of an analytical period where the mobile phase acetonitrile-0.01 M phosphate buffer, pH 2.8 (3:7, v/v) was used, and of a subsequent wash-out period where the plasmatic ballast compounds were eluted from the column using acetonitrile-ultra-high-quality water (8:2, v/v). The whole analysis, including the equilibration preceding the initial analytical conditions lasted 19 min. Fluorescence detection (lambda(ex) 202 nm/lambda(em) 296 nm for tramadol and its metabolite, lambda(ex) 264 nm/lambda(em) 344 nm for N1,N1-dimethylsulfanilamide) was used. The validated analytical method was applied to pharmacokinetic studies of tramadol in human volunteers.
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Affiliation(s)
- M Nobilis
- Institute of Experimental Biopharmaceutics, Joint Research Center of Academy of Sciences of the Czech Republic and PRO.MED.CS Praha a.s., Hradec Králové
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20
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Soetebeer UB, Schierenberg MO, Schulz H, Andresen P, Blaschke G. Direct chiral assay of tramadol and detection of the phase II metabolite O-demethyl tramadol glucuronide in human urine using capillary electrophoresis with laser-induced native fluorescence detection. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2001; 765:3-13. [PMID: 11817307 DOI: 10.1016/s0378-4347(01)00366-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A chiral separation using carboxymethyl-beta-cyclodextrin and methyl-beta-cyclodextrin for the direct assay of tramadol in human urine by capillary electrophoresis (CE) with laser-induced native fluorescence detection was developed. Furthermore, the phase II metabolite O-demethyl tramadol glucuronide was determined from the urine samples and the ratio of the diasteromers was determined. The chiral method was validated. Correlation coefficients were higher than 0.999. Within day variation showed accuracy in the range 96.1-105.8% with a RSD less than 6.00%. Day to day variation present an accuracy ranging from 100.2 to 103.5% with a RSD less than 5.4%. After oral administration of 150 mg tramadol hydrochloride to a healthy volunteer, the urinary excretion was monitored during 24 h. About 11.4% of the dose was excreted as 1S,2S-tramadol, 16.4% as 1R,2R-tramadol and 23.7% as O-demethyl tramadol glucuronide. The amount of 1S,2S O-demethyl tramadol glucuronide was more than three fold higher as IR,2R-O-demethyl tramadol glucuronide. The enantiomeric ratio of tramadol and the diastereomeric ratio of O-demethyl tramadol glucuronide was deviated from 1.0 showing that a stereoselective metabolism of tramadol occurs.
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Affiliation(s)
- U B Soetebeer
- Institute of Pharmaceutical Chemistry, University of Münster, Germany
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21
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Tao Q, Stone DJ, Borenstein MR, Jean-Bart V, Codd EE, Coogan TP, Desai-Krieger D, Liao S, Raffa RB. Gas chromatographic method using nitrogen-phosphorus detection for the measurement of tramadol and its O-desmethyl metabolite in plasma and brain tissue of mice and rats. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2001; 763:165-71. [PMID: 11710575 DOI: 10.1016/s0378-4347(01)00388-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A method that allows the measurement of plasma and brain levels of the centrally-acting analgesic tramadol and its major metabolite (O-desmethyl tramadol) in mice and rats was developed using gas chromatography equipped with nitrogen-phosphorus detection (GC-NPD). Plasma samples were extracted with methyl tert.-butyl ether (MTBE) and were injected directly into the GC system. Brain tissue homogenates were precipitated with methanol, the resulting supernatant was dried then acidified with hydrochloric acid. The aqueous solution was washed with MTBE twice, alkalinized, and extracted with MTBE. The MTBE layer was dried, reconstituted and injected into the GC system. The GC assay used a DB-1 capillary column with an oven temperature ramp (135 to 179 degrees C at 4 degrees C/min). Dextromethorphan was used as the internal standard. The calibration curves for tramadol and O-desmethyl tramadol in plasma and brain tissue were linear in the range of 10 to 10000 ng/ml (plasma) and ng/g (brain). Assay accuracy and precision of back calculated standards were within +/- 15%.
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Affiliation(s)
- Q Tao
- Temple University School of Pharmacy, Philadelphia, PA 19140, USA
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22
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Ceccato A, Vanderbist F, Pabst JY, Streel B. Enantiomeric determination of tramadol and its main metabolite O-desmethyltramadol in human plasma by liquid chromatography-tandem mass spectrometry. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2000; 748:65-76. [PMID: 11092587 DOI: 10.1016/s0378-4347(00)00318-2] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Pharmacokinetic studies require sensitive analytical methods to allow the determination of low concentrations of drugs and metabolites. When drugs present an asymmetric center, the enantiomeric determination of the compounds of interest should be performed. The method developed is based on on-line LC-MS-MS using atmospheric pressure chemical ionization as an interface determination of enantiomers of tramadol (T) and its active metabolite O-desmethyltramadol (ODT) in human plasma. This determination is preceded by an off-line solid-phase extraction (SPE) on disposable extraction cartridges (DECs), performed automatically by means of a sample processor equipped with a robotic arm (ASPEC system). The DEC filled with ethyl silica (50 mg) was first conditioned with methanol and water. The washing step was performed with water and the analytes were finally eluted by dispensing methanol. The collected eluate was then evaporated to dryness before being dissolved in the LC mobile phase and injected into the LC system. The enantiomeric separation of tramadol and ODT was achieved on a Chiralpak AD column containing amylose tris-(3,5-dimethylphenylcarbamate) as chiral selector. The mobile phase was isohexane-ethanol-diethylamine (97:3:0.1, v/v). The LC system was then coupled to a tandem mass spectrometry system with an APCI interface in the positive ion mode. The chromatographed analytes were detected in the selected reaction monitoring mode. The MS-MS ion transitions monitored were 264-->58 for tramadol, 250-->58 for ODT, and 278-->58 for ethyltramadol, used as internal standard. The method was validated. The recoveries were around 90% for both T and ODT. The method was found to be linear for each enantiomer of both compounds (r2>0.999). The mean RSD values for repeatability and intermediate precision were 3.5 and 6.4% for T enantiomers and 5.0 and 5.6% for ODT enantiomers, respectively. Moreover, the method was found to be selective towards other metabolites, N-desmethyltramadol and N,O-desmethyltramadol (NODT). The method developed was successfully used to investigate plasma concentration of enantiomers of T and ODT in a pharmacokinetic study.
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Affiliation(s)
- A Ceccato
- Galephar MF, Marche-en-Famenne, Belgium
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23
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Soetebeer UB, Schierenberg MO, Schulz H, Grünefeld G, Andresen P, Blaschke G. Assay of tramadol in urine by capillary electrophoresis using laser-induced native fluorescence detection. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2000; 745:271-8. [PMID: 11043746 DOI: 10.1016/s0378-4347(00)00280-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Capillary electrophoresis (CE) with UV laser-induced native fluorescence detection was developed as a sensitive and selective assay for the direct determination of tramadol in human urine without extraction or preconcentration. The main problem in CE is the small inner diameter of the capillary which causes a low sensitivity with instruments equipped with a UV detector. Laser-induced native fluorescence with a frequency doubled argon ion laser at an excitation wavelength of 257 nm was used for the direct assay of tramadol in urine to enhance the limit of detection about 1,000-fold compared to UV absorption detection. The detection system consists of an imaging spectrograph and an intensified CCD camera, which views an illuminated 1.5 mm section of the capillary. This set-up is able to record the whole emission spectra of the analytes to achieve additionally wavelength-resolved electropherograms. In the concentration range of 20 ng/ml-5 microg/ml in human urine coefficients of correlation were better than 0.998. Within-day variation determined on four different concentrations showed accuracies ranging from 90.2 to 108.4%. The relative standard deviation (RSD) was determined to be less than 10%. Day-to-day variation presented accuracies ranging from 90.9 to 103.1% with an RSD less than 8%.
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Affiliation(s)
- U B Soetebeer
- Institute of Pharmaceutical Chemistry, University of Münster, Germany
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24
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Juzwin SJ, Wang DC, Anderson NJ, Wong FA. The determination of RWJ-38705 (tramadol N-oxide) and its metabolites in preclinical pharmacokinetic studies using LC-MS/MS. J Pharm Biomed Anal 2000; 22:469-80. [PMID: 10766364 DOI: 10.1016/s0731-7085(99)00310-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A rapid and reliable analytical method is described for the simultaneous determination of RWJ-38705 (tramadol N-oxide) and several of its major metabolites in the plasma of Sprague-Dawley rats and Beagle dogs. Sample preparation using solid phase extraction was followed by reversed phase liquid chromatography (LC) coupled with tandem mass spectrometric (MS/MS) detection in the positive ionization mode. The assay was linear for all analytes over concentrations ranging from approximately 6 to 2000 ng/ml. The inter-assay reproducibility was generally less than 15% while accuracy values were within 13% of theoretical. The overall recovery of the analytes ranged from approximately 40 to 64% in rat plasma and 53-75% in dog plasma. This assay has proven to be sensitive, specific and reproducible, and it has been readily implemented in preclinical PK studies. Representative plasma concentration versus time profiles resulting from administration of TNO to rats and dogs are presented in this communication.
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Affiliation(s)
- S J Juzwin
- Department of Bioanalytical Drug Metabolism, The R. W. Johnson Pharmaceutical Research Institute at Ortho Pharmaceutical Corporation, Raritan, NJ 08869, USA.
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25
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Ruda S, Cherkaoui S, Dayer P, Fanali S, Veuthey JL. Simultaneous stereoselective analysis of tramadol and its main phase I metabolites by on-line capillary zone electrophoresis-electrospray ionization mass spectrometry. J Chromatogr A 2000; 868:295-303. [PMID: 10701679 DOI: 10.1016/s0021-9673(99)01257-1] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
On-line combination of partial filling capillary electrophoresis and electrospray ionization mass spectrometry was demonstrated for the simultaneous enantioseparation of tramadol and its main phase I metabolites. The partial filling technique was efficient at avoiding MS contamination by the chiral selector. Different experimental factors were investigated, including the chiral selector nature and concentration, plug length as well as the separation temperature. The best enantioseparation of the investigated compounds was achieved with a coated polyvinyl alcohol capillary and a 40 mM ammonium acetate buffer, pH 4.0, adding sulfobutyl ether beta-cyclodextrin (2.5 mg/ml) as the chiral selector. The charged cyclodextrin not only allowed enantioseparation of tramadol and its metabolites, but also improved the selectivity of compounds with the same molecular mass. Finally, CE-electrospray ionisation-MS was successfully applied to the stereoselective analysis of tramadol and its main metabolites in plasma after a simple liquid-liquid extraction.
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Affiliation(s)
- S Ruda
- Laboratory of Pharmaceutical Analytical Chemistry, University of Geneva, Switzerland
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26
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Ho ST, Wan JJ, Liaw WJ, Ho CM, Li JH. Determination of tramadol by capillary gas chromatography with flame ionization detection. Application to human and rabbit pharmacokinetic studies. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1999; 736:89-96. [PMID: 10676987 DOI: 10.1016/s0378-4347(99)00434-x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A rapid, sensitive, precise and accurate capillary gas chromatographic assay with flame ionization detection was developed for the determination of tramadol in human, rabbit, pig and dog plasma. It is comprised of only a one-step extraction procedure with dichloromethane at pH 11.15 and gas chromatography on a capillary column. The recoveries of tramadol and meperidine (internal standard) were greater than 88%. Calibration graphs were linear over the concentration range 12.5-10,000 ng/ml with a coefficient of variation, both within-day and between-day, of less than 10% at any level. The limit of detection was 8 ng/ml of plasma based on signal-to-noise ratio of 3. Six other clinically used analgesics were investigated to check for potential interferences and their analytical conditions. The specificity of this assay was checked with two major metabolites of tramadol (M1: O-demethyltramadol; M2: N-demethyltramadol). Tramadol in plasma did not decompose significantly at -20 degrees C for 56 days. Pharmacokinetic application with intravenous tramadol in humans and rabbits revealed that tramadol followed a two-compartment open model with one distribution phase and one elimination phase. The distribution and elimination half-lives in humans were 1.02 and 141.9 min. The distribution and elimination half-lives in rabbits were 7.31 and 63.2 min, respectively.
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Affiliation(s)
- S T Ho
- Department of Anesthesiology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
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27
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Rudaz S, Veuthey JL, Desiderio C, Fanali S. Simultaneous stereoselective analysis by capillary electrophoresis of tramadol enantiomers and their main phase I metabolites in urine. J Chromatogr A 1999; 846:227-37. [PMID: 10420614 DOI: 10.1016/s0021-9673(99)00028-x] [Citation(s) in RCA: 45] [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
Capillary zone electrophoresis was successfully applied to the enantiomeric resolution of racemic tramadol and its six phase I metabolites using carboxymethylated beta-cyclodextrin (CMB) added to the background electrolyte (BGE). Baseline resolution of tramadol and its metabolites was obtained in less than 30 min using a 50 mM phosphate buffer (pH 2.5) containing 5 mM of CMB. Chiral determinations of tramadol and its main three metabolites, O-demethyltramadol (M1), N-demethyltramadol (M2) and O-demethyl-N-demethyltramadol (M5), were performed in urine after a simple double liquid-liquid extraction of 200 microliters of biological material. In the tested concentration range (0.5-20 micrograms/ml, except for M2: 0.5-10 micrograms/ml) coefficients of correlation superior than 0.994 were obtained. Within-day variation determined on three different concentrations for each enantiomers showed accuracies ranging from 95.4% to 103.2%. The relative standard deviation (RSD) of these assays was determined to be less than 10.0%. Day-to-day variation presented accuracies ranging from 96.3% to 106.5% with a RSD less than 9.0%. After oral administration of 100 mg of tramadol hydrochloride to an healthy volunteer, the urinary excretion was monitored during 30 h. About 15% of the dose was excreted as unchanged tramadol. The enantiomeric ratios of all the excreted analytes, T, M1, M2 and M5, were found to be very different to 1.0, showing that a stereoselective metabolism of tramadol clearly occurred.
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Affiliation(s)
- S Rudaz
- Istituto di Cromatografia del C.N.R., Rome, Italy
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28
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Campanero MA, Calahorra B, Valle M, Troconiz IF, Honorato J. Enantiomeric separation of tramadol and its active metabolite in human plasma by chiral high-performance liquid chromatography: application to pharmacokinetic studies. Chirality 1999; 11:272-9. [PMID: 10224654 DOI: 10.1002/(sici)1520-636x(1999)11:4<272::aid-chir3>3.0.co;2-i] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A sensitive and stereoselective high-performance liquid chromatographic assay for the quantitative determination of the analgesic tramadol and O-demethyltramadol, an active metabolite, is described in this work. Ketamine was used as internal standard. The assay involved a single tert-butymethylether extraction and liquid chromatography analysis with fluorescence detection. Chromatography was performed at 20 degrees C on a Chiracel OD-R column containing cellulose tris-(3,5-dimethylphenylcarbamate) as stationary phase, preceded by an achiral end-capped C18 column. The mobile phase was a mixture of phosphate buffer (containing sodium perchlorate (0.2 M) and triethylamine (0.09 M) adjusted to pH 6) and acetonitrile (80:20). The method developed was validated. The limit of quantitation of each enantiomer of tramadol and its active metabolite by this method was 0.5 ng/mL; only 0.5 mL of the plasma sample was required for the determination. The calibration curve was linear from 0.5 to 750 ng/mL for tramadol enantiomers, and from 0.5 to 500 ng/mL for O-demethyltramadol enantiomers. Intra and interday precision [coefficient of variation (CV)] did not exceed 10%. Mean recoveries of 95.95 and 97.87% for (+)R,R- and (-)S,S-tramadol and 97.70 and 98.79% for (+)R,R- and (-)S,S-O-demethyltramadol with CVs < 2.15% were obtained. Applicability of the method was demonstrated by a pharmacokinetic study in normal volunteers who received 100 mg of tramadol by the intravenous route.
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Affiliation(s)
- M A Campanero
- Servicio de Farmacología Clínica, Clínica Universitaria de Navarra, Universidad de Navarra, Pamplona, Spain.
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29
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Valle M, Pavón JM, Calvo R, Campanero MA, Trocóniz IF. Simultaneous determination of tramadol and its major active metabolite O-demethyltramadol by high-performance liquid chromatography with electrochemical detection. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1999; 724:83-9. [PMID: 10202960 DOI: 10.1016/s0378-4347(98)00547-7] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A novel, highly sensitive method was developed for simultaneous determination of tramadol and its main active metabolite O-demethyltramadol (ODMT) in rat plasma. The method involves a single-step extraction procedure and a specific determination by high-performance liquid chromatography with electrochemical detection, using an ethoxy analogue of tramadol (L-233) as internal standard. The dual-electrode detector was operated in the oxidation-screening mode. Absolute recoveries of tramadol and ODMT were about 80%. Calibration curves were linear over a concentration range of 10-1000 ng/ml for ODMT and 10-10000 ng/ml for tramadol with intra- and inter-day coefficients of variation not exceeding 10% and 15%, respectively. The limit of quantification for tramadol and ODMT was lower than 15 ng/ml and 10 ng/ml using 100 microl of plasma, respectively. The described method allows an adequate characterization of the plasma vs. time profiles for both compounds.
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Affiliation(s)
- M Valle
- Department of Pharmacology, School of Medicine, University of the Basque Country, Bizkaia, Spain
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30
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Abstract
An achiral and chiral separation for the determination of tramadol and its main metabolite O-demethyltramadol in urine samples by CE with UV detection was developed. It was possible to separate tramadol and its phase I and phase II metabolites in one single run using a borate buffer. Furthermore, the simultaneous chiral separation of tramadol and the phase I metabolites was achieved using carboxymethyl-beta-cyclodextrin as chiral selector. To reach the required limits of quantification for the analytes, a preconcentration by solid-phase extraction for the achiral assay and by liquid-liquid extraction for the chiral assay was used. The methods were validated and their applicability was shown by the determination of tramadol and O-demethyltramadol in urine samples.
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Affiliation(s)
- B Kurth
- Institute of Pharmaceutical Chemistry, University of Münster, Germany
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31
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Rudaz S, Veuthey JL, Desiderio C, Fanali S. Use of cyclodextrins in capillary electrophoresis: resolution of tramadol enantiomers. Electrophoresis 1998; 19:2883-9. [PMID: 9870383 DOI: 10.1002/elps.1150191614] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Capillary zone electrophoresis was successfully applied to the enantiomeric resolution of racemic tramadol. Both uncoated and polyacrylamide-coated capillaries were tested for method optimization using either negatively charged or native cyclodextrins (CD) added to the background electrolyte (BGE). The resolution was strongly influenced by the CD type and concentration as well as by the pH and the concentration of the BGE. Among the CDs tested, carboxymethylated-beta-cyclodextrin allowed the baseline separation of tramadol enantiomers. After the method was optimized, it was validated in a coated capillary for enantiomeric analysis of tramadol enantiomers in pharmaceutical formulation, including specificity and elution order, linearity, accuracy and precision, determination of limit of detection (LOD) and quantification (LOQ), enantiomeric purity linearity, freedom from interference, and stability of sample solutions. Precision at the target concentration was less than 2%, with an accuracy higher than 99%. Furthermore, the method was able to detect 0.3% and to quantify 1% of the minor enantiomer in the presence of the major one at the target value.
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Affiliation(s)
- S Rudaz
- Istituto di Cromatografia del CNR, Area della Ricerca di Roma, Monterotondo Scalo, Italy
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32
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Campanero MA, Calahorra B, García-Quetglás E, Escolar M, Honorato J. High-performance liquid chromatographic assay for simultaneous determination of tramadol and its active metabolite in human plasma. Application to pharmacokinetic studies. Chromatographia 1998. [DOI: 10.1007/bf02466649] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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