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Butiulca M, Farczadi L, Vari CE, Imre S, Pui M, Lazar A. LC-MS/MS assisted biomonitoring of ropivacaine and 3-OH-ropivacaine after plane block anesthesia for cardiac device implantation. Front Mol Biosci 2023; 10:1243103. [PMID: 37828919 PMCID: PMC10566374 DOI: 10.3389/fmolb.2023.1243103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 09/08/2023] [Indexed: 10/14/2023] Open
Abstract
Introduction: Ropivacaine is a popular local anesthetic used for regional anesthesia or for pain management. Although designed as an enantiomerically pure drug, an aspect that reduces the adverse effects, its toxicological effects are still a risk. As such, biomonitoring to assure appropriate dosage and bioavailability are essential to avoid complications during or post-surgery. Methods: The study focused on developing a sensitive, selective, and accurate liquid chromatography-mass spectrometry (LCMS/MS) method which facilitates the biomonitoring of ropivacaine and its main metabolite in plasma after regional anesthesia using ropivacaine. Results and Discussion: The method was validated with regards to all relevant parameters, such as sensitivity, selectivity, accuracy, precision, and the effect of sample matrix. The method was successfully used in a pilot study, which included one patient undergoing plane block anesthesia for cardiac device implantation. The results showed the method is appropriate for its intended purpose and could even be used in other, similar applications.
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Affiliation(s)
- Mihaela Butiulca
- Department of Anesthesiology and Intensive Care Medicine, Faculty of General Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology, Târgu Mureș, Romania
- Department of Anesthesiology and Intensive Care Medicine, Emergency County Hospital, Târgu Mureș, Romania
| | - Lenard Farczadi
- Chromatography and Mass Spectrometry Laboratory, Center for Advanced Medical and Pharmaceutical Research, George Emil Palade University of Medicine, Pharmacy, Science, and Technology, Târgu Mureș, Romania
| | - Camil Eugen Vari
- Department of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science, and Technology, Târgu Mureș, Romania
| | - Silvia Imre
- Chromatography and Mass Spectrometry Laboratory, Center for Advanced Medical and Pharmaceutical Research, George Emil Palade University of Medicine, Pharmacy, Science, and Technology, Târgu Mureș, Romania
- Department of Analytical Chemistry and Drug Analysis, Faculty of Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science, and Technology, Târgu Mureș, Romania
| | - Mihai Pui
- Department of Anesthesiology and Intensive Care Medicine, Emergency County Hospital, Târgu Mureș, Romania
| | - Alexandra Lazar
- Department of Anesthesiology and Intensive Care Medicine, Faculty of General Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology, Târgu Mureș, Romania
- Department of Anesthesiology and Intensive Care Medicine, Emergency County Hospital, Târgu Mureș, Romania
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Versyck B, Vermeylen K, Willemse J, van Geffen GJ, Leunen I, Soetens F, Devos S, Roosens L. Serum concentrations of local anesthetics after unilateral interpectoral-pectoserratus plane block in breast cancer surgery: a pharmacokinetic study. Reg Anesth Pain Med 2023; 48:399-402. [PMID: 36787951 DOI: 10.1136/rapm-2022-104166] [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: 11/07/2022] [Accepted: 01/30/2023] [Indexed: 02/16/2023]
Abstract
INTRODUCTION The ultrasound-guided interpectoral-pectoserratus plane block is a fascial plane block for superficial surgery of the anterolateral chest wall. This technique involves injecting a relatively large volume of local anesthetics (typically 30 mL of 0.25%-0.50%, ie, 75-150 mg ropivacaine) underneath the major and minor pectoral muscles of the anterior thoracic wall. There is a potential risk of toxic serum concentrations of local anesthetics due to systemic absorption. METHODS 22 patients scheduled for elective unilateral breast cancer surgery were included in this study. All surgery was performed with general anesthesia and an ultrasound-guided interpectoral-pectoserratus plane block with 2.5 mg/kg ropivacaine. Ten venous blood samples were collected at 0 (two samples) 10, 20, 30, 45, 60, 90 and 120 min and at 4 hours after performing the block. Free and total ropivacaine levels were measured at each time point. Albumin and alpha-1-acid-glycoprotein were measured to monitor shifts between the free and bound fraction of ropivacaine. RESULTS Samples of 20 patients were analyzed. The mean dose of ropivacaine was 172.8 (22.5) mg. In 50% of the patients, the potentially toxic threshold of 0.15 µg/mL free ropivacaine concentration was exceeded. Mean peak serum concentration occurred at 20 min postinjection. CONCLUSIONS This pharmacokinetic study demonstrated that a 2.5 mg/kg ropivacaine interpectoral-pectoserratus plane block may result in exceeding the threshold for local anesthetic systemic toxicity.
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Affiliation(s)
- Barbara Versyck
- Department of Anesthesia and Intensive Care, AZ Turnhout Campus Sint-Jozef, Turnhout, Antwerpen, Belgium
- Department of Anesthesiology, Catharina Hospital Eindhoven, Eindhoven, The Netherlands
| | - Kris Vermeylen
- Department of Anesthesia and Intensive Care, AZ Turnhout Campus Sint-Jozef, Turnhout, Antwerpen, Belgium
| | - Johan Willemse
- Department of Clinical Biology, AZ Turnhout Campus Sint Elisabeth, Turnhout, Antwerpen, Belgium
| | | | - Ine Leunen
- Department of Anesthesia and Intensive Care, AZ Turnhout Campus Sint-Jozef, Turnhout, Antwerpen, Belgium
| | - Filiep Soetens
- Department of Anesthesia and Intensive Care, AZ Turnhout Campus Sint-Jozef, Turnhout, Antwerpen, Belgium
| | - Sylvie Devos
- Department of Clinical Biology, University Hospital Antwerp, Edegem, Belgium
| | - Laurence Roosens
- Department of Clinical Biology, University Hospital Antwerp, Edegem, Belgium
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Lonnqvist PA. Efficacy and pharmacokinetics of erector spinae plane block in children. Reg Anesth Pain Med 2021; 46:1013-1014. [PMID: 33495267 PMCID: PMC8543227 DOI: 10.1136/rapm-2020-102354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 12/04/2020] [Indexed: 12/16/2022]
Affiliation(s)
- Per-Arne Lonnqvist
- Department of Physiology & Pharmacology, Karolinska Institute, Stockholm, Sweden
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Simultaneous Determination of Ropivacaine and 3-Hydroxy Ropivacaine in Cerebrospinal Fluid by UPLC-MS/MS. BIOMED RESEARCH INTERNATIONAL 2020; 2020:8844866. [PMID: 33490261 PMCID: PMC7787762 DOI: 10.1155/2020/8844866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 11/19/2020] [Accepted: 11/25/2020] [Indexed: 11/17/2022]
Abstract
In this paper, a UPLC-MS/MS method was developed for the determination of ropivacaine and its metabolite 3-hydroxy ropivacaine in cerebrospinal fluid. The cerebrospinal fluid was processed by ethyl acetate liquid-liquid extraction. The multiple reaction monitoring (MRM) mode was used for quantitative analysis by monitoring the transitions of m/z 275.3 → 126.2 for ropivacaine, m/z 291.0 → 126.0 for 3-hydroxy ropivacaine, and m/z 290.2 → 198.2 for the internal standard. Standard curves for ropivacaine and 3-hydroxy ropivacaine in cerebrospinal fluid were conducted over the concentration range of 0.2–2000 ng/mL, demonstrating excellent linearity, and the lower limit of quantification was 0.2 ng/mL. The intraday precision of ropivacaine and 3-hydroxy ropivacaine was less than 11%, while the interday precision was less than 7%. The accuracy ranged between 87% and 107%, the average extraction efficiency was higher than 79%, and the matrix effect was between 89% and 98%. The developed method was then applied to a case of suspected poisoning of ropivacaine.
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Lamy E, Fall F, Boigne L, Gromov K, Fabresse N, Grassin-Delyle S. Validation according to European and American regulatory agencies guidelines of an LC-MS/MS method for the quantification of free and total ropivacaine in human plasma. ACTA ACUST UNITED AC 2020; 58:701-708. [DOI: 10.1515/cclm-2018-1298] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 03/05/2019] [Indexed: 11/15/2022]
Abstract
AbstractBackgroundRopivacaine is a widely used local anaesthetic drug, highly bound to plasma proteins with a free plasma fraction of about 5%. Therefore, the monitoring of free drug concentration is most relevant to perform pharmacokinetic studies and to understand the drug pharmacokinetic/pharmacodynamic (PK/PD) relationship.MethodsA high-sensitivity liquid chromatography-tandem mass spectrometry (LC-MS/MS) method using reverse-phase LC and electrospray ionisation mass spectrometry with multiple reaction monitoring (MRM) is described for the quantitation of both free and total ropivacaine in human plasma. Ropivacaine-d7 was used as an internal standard (IS).ResultsThe method was validated in the range 0.5–3000 ng/mL, with five levels of QC samples and according to the European Medicine Agency and Food and Drug Administration guidelines. The performance of the method was excellent with a precision in the range 6.2%–14.7%, an accuracy between 93.6% and 113.7% and a coefficient of variation (CV) of the IS-normalised matrix factor below 15%. This suitability of the method for the quantification of free and total ropivacaine in clinical samples was demonstrated with the analysis of samples from patients undergoing knee arthroplasty and receiving a local ropivacaine infiltration.ConclusionsA method was developed and validated for the quantification of free and total ropivacaine in human plasma and was shown suitable for the analysis of clinical samples.
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Affiliation(s)
- Elodie Lamy
- Plateforme de spectrométrie de masse MasSpecLab, INSERM UMR 1173, UFR Simone Veil – Santé, Université Versailles Saint Quentin, Université Paris Saclay, Montigny le Bretonneux, France
| | - Fanta Fall
- Plateforme de spectrométrie de masse MasSpecLab, INSERM UMR 1173, UFR Simone Veil – Santé, Université Versailles Saint Quentin, Université Paris Saclay, Montigny le Bretonneux, France
| | - Lisa Boigne
- Plateforme de spectrométrie de masse MasSpecLab, INSERM UMR 1173, UFR Simone Veil – Santé, Université Versailles Saint Quentin, Université Paris Saclay, Montigny le Bretonneux, France
| | - Kirill Gromov
- Department of Orthopaedic Surgery, Copenhagen University Hospital, Hvidovre, Denmark
| | - Nicolas Fabresse
- Plateforme de spectrométrie de masse MasSpecLab, INSERM UMR 1173, UFR Simone Veil – Santé, Université Versailles Saint Quentin, Université Paris Saclay, Montigny le Bretonneux, France
- Laboratoire de Toxicologie, Hôpital Raymond Poincaré, AP-HP, Garches, France
| | - Stanislas Grassin-Delyle
- Plateforme de spectrométrie de masse MasSpecLab, INSERM UMR 1173, UFR Simone Veil – Santé, Université Versailles Saint Quentin, Université Paris Saclay, Montigny le Bretonneux, France
- Département des maladies respiratoires, Hôpital Foch, Suresnes, France, Phone: +33.1.70.42.94.22
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Population Pharmacokinetics of Levobupivacaine During Transversus Abdominis Plane Block in Children. Ther Drug Monit 2019; 42:497-502. [PMID: 31633607 DOI: 10.1097/ftd.0000000000000702] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Levobupivacaine is commonly used during transversus abdominis plane (TAP) block in pediatric patients. However, the dosing regimen is still empirical, and the pharmacokinetic properties of levobupivacaine are not considered. Here, the pharmacokinetics of levobupivacaine during an ultrasound-guided TAP block were evaluated to optimize dosing regimen, regarding the between-subject variability (BSV) and the volume of levobupivacaine injected. METHOD The clinical trial (prospective, randomized, double-blind study protocol) was conducted in 40 children aged 1-5 years, who were scheduled for inguinal surgery. Each patient received 0.4 mg/kg of levobupivacaine with a volume of local anesthesia solution adjusted to 0.2 mL/kg of 0.2% or 0.4 mL/kg of 0.1% levobupivacaine. Blood samples were collected at 5, 15, 20, 25, 30, 45, 60, and 75 minutes after the block injection. The population pharmacokinetic analysis was performed using the NONMEM software. RESULTS From the pharmacokinetic parameters obtained, median Cmax, tmax,, and area under the concentration versus time curve were 0.315 mg/L, 17 minutes, and 41 mg/L·min, respectively. BSV of clearance was explained by weight. At the dose regimen of 0.4 mg/kg, none of the infants showed signs of toxicity, but in 13 patients, TAP block failed. After analysis, BSV for absorption rate constant, distribution volume, and clearance were 81%, 47%, and 41%, respectively. Residual unexplained variability was estimated to be 14%. CONCLUSIONS For improved efficiency in the pediatric population, the dose of levobupivacaine should be greater than 0.4 mg/kg. Children's weight should be considered to anticipate any risk of toxicity.
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Sola C, Menacé C, Bringuier S, Saour AC, Raux O, Mathieu O, Capdevila X, Dadure C. Transversus Abdominal Plane Block in Children: Efficacy and Safety: A Randomized Clinical Study and Pharmacokinetic Profile. Anesth Analg 2019; 128:1234-1241. [PMID: 31094793 DOI: 10.1213/ane.0000000000003736] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND The transversus abdominis plane (TAP) block has become a common regional anesthesia technique for pain management in a wide variety of abdominal procedures. Evidence to support any particular local anesthetic regimen as well as pharmacokinetic and systemic toxicity risks of TAP block remain insufficiently studied in children. The aim of this study was to compare the analgesic effects and investigate pharmacokinetic profile of levobupivacaine after ultrasound-guided TAP block using a low volume/high concentration (LVHC) or a high volume/low concentration (HVLC) solution in children. METHODS This prospective randomized study included children scheduled for day-case inguinal surgery. Children were randomized to receive TAP block using 0.4 mg·kg levobupivacaine as either HVLC (0.2 mL·kg of 0.2% levobupivacaine) or LVHC (0.1 mL·kg of 0.4% levobupivacaine). The primary outcome was the number of children who required opioid rescue analgesia postoperatively. Pharmacokinetic profile study of levobupivacaine was also performed. RESULTS Seventy patients were equally randomized, and 65 were included in the final analysis. Seventy-one percent of patients did not require any postoperative opioid analgesia. The number of patients who received rescue analgesia was 12 (35%) in the LVHC group and 7 (23%) in the HVLC group (relative risk, 0.64; 95% confidence interval [CI], 0.29-1.42; P = .26). Mean pain scores (FLACC [faces, legs, activity, cry, and consolability]) at postanesthesia care unit discharge did not differ between LVHC and HVLC groups, respectively, 0.39 ± 0.86 and 1 ± 1.71 with mean group difference -0.60 (95% CI, -1.27 to 0.06; P = .08). The pharmacokinetic profile of levobupivacaine was comparable in the 2 groups: the mean total and free levobupivacaine peak concentrations were 379 ± 248 and 3.95 ± 3.16 ng·mL, respectively, occurring 22.5 ± 11 minutes after injection. The highest total and free levobupivacaine concentrations collected, respectively, 1360 and 15.1 ng·mL, remained far below theoretical toxic thresholds. CONCLUSIONS In children, quality of postoperative pain control provided by TAP block using levobupivacaine 0.4 mg·kg administered as either HVLC or LVHC did not differ and was associated with a very low risk of local anesthetic systemic toxicity.
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Affiliation(s)
- Chrystelle Sola
- From the Pediatric Anesthesia Unit, Department of Anesthesia and Critical Care Medicine, Lapeyronie University Hospital, Montpellier University, Montpellier, France
- IGF, Montpellier University, CNRS, INSERM, Montpellier, France
| | - Cecilia Menacé
- Department of Anesthesia and Critical Care Medicine, Lapeyronie University Hospital, Montpellier, France
| | - Sophie Bringuier
- Department of Anesthesia and Critical Care Medicine, Lapeyronie University Hospital, Montpellier, France
| | - Anne-Charlotte Saour
- From the Pediatric Anesthesia Unit, Department of Anesthesia and Critical Care Medicine, Lapeyronie University Hospital, Montpellier University, Montpellier, France
| | - Olivier Raux
- From the Pediatric Anesthesia Unit, Department of Anesthesia and Critical Care Medicine, Lapeyronie University Hospital, Montpellier University, Montpellier, France
| | - Olivier Mathieu
- Department of Medical Pharmacology and Toxicology, Toxicology Laboratory, Montpellier University Hospital, UMR 5569 Hydrosciences Montpellier, Montpellier University, Montpellier, France
| | - Xavier Capdevila
- Department of Anesthesia and Critical Care Medicine, Lapeyronie University Hospital, Inserm Unit 1051 INM, Montpellier University, Montpellier, France
| | - Christophe Dadure
- From the Pediatric Anesthesia Unit, Department of Anesthesia and Critical Care Medicine, Lapeyronie University Hospital, Montpellier University, Montpellier, France
- Department of Anesthesia and Critical Care Medicine, Lapeyronie University Hospital, Inserm Unit 1051 INM, Montpellier University, Montpellier, France
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Mano Y, Kusano K. A validated LC-MS/MS method of total and unbound lenvatinib quantification in human serum for protein binding studies by equilibrium dialysis. J Pharm Biomed Anal 2015; 114:82-7. [PMID: 26026266 DOI: 10.1016/j.jpba.2015.05.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 05/11/2015] [Accepted: 05/12/2015] [Indexed: 11/19/2022]
Abstract
A sensitive method for the determination of total and unbound lenvatinib (Lenvima™), a novel tyrosine kinase inhibitor, in human serum was developed for protein binding studies using an equilibrium dialysis and liquid chromatography with tandem mass spectrometry. Serum samples (0.8 mL) were dialyzed against phosphate buffered saline (PBS) in dialyzer for 18 h at 37 °C to obtain dialysate and serum for unbound and total lenvatinib, respectively. After extraction by organic solvent, separation was achieved on a Symmetry Shield RP8 column with isocratic elution of 2 mM ammonium acetate (pH 4.0)-acetonitrile (3:2, v/v) at the flow rate of 0.2 mL/min. Detection was performed using API4000 with multiple reaction monitoring mode using positive electrospray ionization. The standard curve ranged from 0.0400 to 16.0 ng/mL and 0.0800 to 400 ng/mL as lenvatinib free base in PBS and serum, respectively. Accuracy and precision in the intra- and inter-batch reproducibility study were within the acceptance criteria. Various stability assessments including bench-top, freeze/thaw, processed samples, and frozen stability confirmed that lenvatinib was stable in serum and PBS. Application to in vivo protein binding studies in clinical studies was successfully performed and results showed that lenvatinib was highly protein bound in serum.
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Affiliation(s)
- Yuji Mano
- Drug Metabolism and Pharmacokinetics, Biopharmaceutical Assessment Core Function Unit, Eisai Co., Ltd., 1-3, 5-chome, Tokodai, Tsukuba-shi, Ibaraki 300-2635, Japan.
| | - Kazutomi Kusano
- Drug Metabolism and Pharmacokinetics, Biopharmaceutical Assessment Core Function Unit, Eisai Co., Ltd., 1-3, 5-chome, Tokodai, Tsukuba-shi, Ibaraki 300-2635, Japan
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Wu RJ, Chen MY, Hsien BH, Luk HN, Chavali M. Online Detection of Ropivacaine in Drip Bags Using Polypyrrole/graphene Oxide Materials. J CHIN CHEM SOC-TAIP 2014. [DOI: 10.1002/jccs.201400144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Accuracy assessment on the analysis of unbound drug in plasma by comparing traditional centrifugal ultrafiltration with hollow fiber centrifugal ultrafiltration and application in pharmacokinetic study. J Chromatogr A 2013; 1318:265-9. [DOI: 10.1016/j.chroma.2013.09.078] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Revised: 09/10/2013] [Accepted: 09/25/2013] [Indexed: 01/03/2023]
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A critical review of microextraction by packed sorbent as a sample preparation approach in drug bioanalysis. Bioanalysis 2013; 5:1409-42. [DOI: 10.4155/bio.13.92] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Sample preparation is widely accepted as the most labor-intensive and error-prone part of the bioanalytical process. The recent advances in this field have been focused on the miniaturization and integration of sample preparation online with analytical instrumentation, in order to reduce laboratory workload and increase analytical performance. From this perspective, microextraction by packed sorbent (MEPS) has emerged in the last few years as a powerful sample preparation approach suitable to be easily automated with liquid and gas chromatographic systems applied in a variety of bioanalytical areas (pharmaceutical, clinical, toxicological, environmental and food research). This paper aims to provide an overview and a critical discussion of recent bioanalytical methods reported in literature based on MEPS, with special emphasis on those developed for the quantification of therapeutic drugs and/or metabolites in biological samples. The advantages and some limitations of MEPS, as well as its comparison with other extraction techniques, are also addressed herein.
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Dong WC, Zhang ZQ, Jiang XH, Sun YG, Jiang Y. Effect of volume ratio of ultrafiltrate to sample solution on the analysis of free drug and measurement of free carbamazepine in clinical drug monitoring. Eur J Pharm Sci 2012. [PMID: 23201310 DOI: 10.1016/j.ejps.2012.11.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Traditional ultrafiltration (UF) usually has a large volume ratio of ultrafiltrate to sample solution, and this ratio cannot be well controlled. It can break the balance of protein-binding equilibrium and exert an influence on the analysis of free drug. In the present study, we evaluated the influence of volume ratio of ultrafiltrate to sample solution on the analysis of free drug in human plasma. We used carbamazepine as a model drug and studied the effect of different centrifugation times on ultrafitrate volume and the related effects on unbound carbamazepine measurement. Moreover, we compared the hollow fiber centrifugal ultrafiltration (HFCF-UF) with traditional UF. Our results showed that the ultrafiltrate volume was changed from 40 to 400 μL with the increase of centrifugation time for the traditional UF, and the related changes in unbound concentration were significant. The rate of protein binding (BP) was changed from 40% to 70%. In contrast, a tiny and invariant ultrafiltrate yield (40 μL) was obtained using the HFCF-UF method, and the BP rate was around 72%. In addition, with the HFCF-UF method, the volume ratio of ultrafiltrate to sample solution could be also well controlled by the inner diameters of both the glass tube and hollow fiber. The HFCF-UF method was a more accurate plasma pretreatment procedure, by which the in vivo balance of protein-binding equilibrium was hardly broken. Therefore, this method was successfully employed to quantify the free fraction of carbamazepine in clinical samples.
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Affiliation(s)
- Wei-Chong Dong
- Department of Pharmaceutical Analysis, School of Pharmacy, Hebei Medical University, Shijiazhuang, Hebei Province 050017, China
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Baniceru M, Manda CV, Popescu SM. Chromatographic analysis of local anesthetics in biological samples. J Pharm Biomed Anal 2011; 54:1-12. [DOI: 10.1016/j.jpba.2010.07.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2010] [Revised: 07/10/2010] [Accepted: 07/13/2010] [Indexed: 10/19/2022]
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ZHOU Z, YE J, CHEN L, MA A, ZOU F. Simultaneous Determination of Ropivacaine, Bupivacaine and Dexamethasone in Biodegradable PLGA Microspheres by High Performance Liquid Chromatography. YAKUGAKU ZASSHI 2010; 130:1061-8. [DOI: 10.1248/yakushi.130.1061] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Zhifeng ZHOU
- School of Public Health and Tropical Medicine, Southern Medical University
| | - Jufeng YE
- School of Public Health and Tropical Medicine, Southern Medical University
| | - Lingyun CHEN
- School of Public Health and Tropical Medicine, Southern Medical University
| | - Ande MA
- School of Public Health and Tropical Medicine, Southern Medical University
| | - Fei ZOU
- School of Public Health and Tropical Medicine, Southern Medical University
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Breindahl T, Simonsen O, Andreasen K. Column-switching HPLC–MS/MS analysis of ropivacaine in serum, ultrafiltrate and drainage blood for validating the safety of blood reinfusion. J Chromatogr B Analyt Technol Biomed Life Sci 2010; 878:76-82. [DOI: 10.1016/j.jchromb.2009.11.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Revised: 11/13/2009] [Accepted: 11/15/2009] [Indexed: 10/20/2022]
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High-Performance Liquid Chromatography Using UV Detection for the Simultaneous Quantification of Ropivacaine and Bupivacaine in Human Plasma. Ther Drug Monit 2009; 31:753-7. [DOI: 10.1097/ftd.0b013e3181bc8014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Sawaki K, Okubo M, Shimomiya T, Tukagoshi E, Sakai T, Yamazaki T, Kenmochi M, Miyao M, Kaneko Y, Ichinohe T, Kawaguchi M. Evaluation of high-performance liquid chromatography and mass spectrometry method for pharmacokinetic study of local anesthetic ropivacaine in plasma. Biomed Res 2009; 30:319-24. [DOI: 10.2220/biomedres.30.319] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Current literature in mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2006; 41:1520-1531. [PMID: 17103385 DOI: 10.1002/jms.958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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