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Mizuno S, Lee XP, Fujishiro M, Matsuyama T, Yamada M, Sakamoto Y, Kusano M, Zaitsu K, Hasegawa C, Hasegawa I, Kumazawa T, Ishii A, Sato K. High-throughput determination of valproate in human samples by modified QuEChERS extraction and GC-MS/MS. Leg Med (Tokyo) 2018; 31:66-73. [PMID: 29413992 DOI: 10.1016/j.legalmed.2018.01.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2017] [Revised: 01/04/2018] [Accepted: 01/15/2018] [Indexed: 11/25/2022]
Abstract
A new high-throughput method was developed for analysis of valproate in human plasma samples by QuEChERS extraction and gas chromatography-tandem mass spectrometry (GC-MS/MS). Plasma samples (0.2 ml) spiked with valproate and secobarbital-d5 (internal standard) were diluted with 1.3 ml of distilled water. Acetonitrile (1 ml) was added followed by 0.4 g MgSO4 and 0.1 g NaOAC. After a centrifugation step (2000 g for 10 min), 1 ml of the supernatant was transferred to a dispersive-solid phase extraction (dSPE) tube containing 150 mg MgSO4 and 50 mg C18. This mixture was vortexed and centrifuged at 3000 g for 5 min, and then the upper layer was evaporated to dryness under a stream of nitrogen. The residue was dissolved in 40 μl ethyl acetate, and a 1-μl aliquot was injected into the GC-MS/MS. The GC separation of the compounds was achieved on a fused-silica capillary column Rxi-5Sil MS (30 m × 0.25 mm i.d.; 0.25-µm film thickness) and detected by MS/MS operating in electron ionization ion source mode. The regression equations showed excellent linearity (r > 0.9997) from 50 to 5000 ng/ml for plasma, with limit of detection of 10 ng/ml. The extraction efficiency of valproate for plasma ranged between 71.2%-103.5%. The coefficient of variation was <18.5%. The method was successfully applied to actual analyses of an autopsy case. This method can be useful for simple and reliable measurements of valproate in clinical and toxicological analyses; it can be integrated in screening and simultaneous determination methods for multiple drugs and poisons in the further studies.
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Affiliation(s)
- Shun Mizuno
- Department of Legal Medicine, Showa University School of Medicine, Tokyo 142-8555, Japan
| | - Xiao-Pen Lee
- Department of Legal Medicine, Showa University School of Medicine, Tokyo 142-8555, Japan.
| | - Masaya Fujishiro
- Department of Legal Medicine, Showa University School of Medicine, Tokyo 142-8555, Japan
| | - Takaaki Matsuyama
- Department of Legal Medicine, Showa University School of Medicine, Tokyo 142-8555, Japan
| | - Miho Yamada
- Department of Legal Medicine, Showa University School of Medicine, Tokyo 142-8555, Japan
| | | | - Maiko Kusano
- Department of Legal Medicine and Bioethics, Nagoya University, Aichi 466-8550, Japan
| | - Kei Zaitsu
- Department of Legal Medicine and Bioethics, Nagoya University, Aichi 466-8550, Japan
| | - Chika Hasegawa
- Department of Legal Medicine, Showa University School of Medicine, Tokyo 142-8555, Japan; Department of Legal Medicine, Toho University School of Medicine, Tokyo 143-8540, Japan
| | - Iwao Hasegawa
- University Center of Legal Medicine, Kanagawa Dental University, Kanagawa 238-8580, Japan
| | - Takeshi Kumazawa
- Department of Legal Medicine, Showa University School of Medicine, Tokyo 142-8555, Japan; Seirei Christopher University School of Nursing, Shizuoka 433-8558, Japan
| | - Akira Ishii
- Department of Legal Medicine and Bioethics, Nagoya University, Aichi 466-8550, Japan
| | - Keizo Sato
- Department of Legal Medicine, Showa University School of Medicine, Tokyo 142-8555, Japan
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Electrochemical Determination of Dextromethorphan on Reduced Graphene Oxide Modified Screen-Printed Electrode after Electromembrane Extraction. ELECTROANAL 2014. [DOI: 10.1002/elan.201300323] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Rajan S, Colaco S, Ramesh N, Meyyanathan SN, Elango K. Development and validation of dissolution study of sustained release dextromethorphan hydrobromide tablets. Pak J Biol Sci 2014; 17:429-433. [PMID: 24897800 DOI: 10.3923/pjbs.2014.429.433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This study describes the development and validation of dissolution tests for sustained release Dextromethorphan hydrobromide tablets using an HPLC method. Chromatographic separation was achieved on a C18 column utilizing 0.5% triethylamine (pH 7.5) and acetonitrile in the ratio of 50:50. The detection wavelength was 280 nm. The method was validated and response was found to be linear in the drug concentration range of 10-80 microg mL(-1). The suitable conditions were clearly decided after testing sink conditions, dissolution medium and agitation intensity. The most excellent dissolution conditions tested, for the Dextromethorphan hydrobromide was applied to appraise the dissolution profiles. The method was validated and response was found to be linear in the drug concentration range of 10-80 microg mL(-1). The method was established to have sufficient intermediate precision as similar separation was achieved on another instrument handled by different operators. Mean Recovery was 101.82%. Intra precisions for three different concentrations were 1.23, 1.10 0.72 and 1.57, 1.69, 0.95 and inter run precisions were % RSD 0.83, 1.36 and 1.57%, respectively. The method was successfully applied for dissolution study of the developed Dextromethorphan hydrobromide tablets.
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Simultaneous determination of dextromethorphan, dextrorphan and doxylamine in human plasma by HPLC coupled to electrospray ionization tandem mass spectrometry: Application to a pharmacokinetic study. J Chromatogr B Analyt Technol Biomed Life Sci 2012; 899:46-56. [DOI: 10.1016/j.jchromb.2012.05.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Revised: 04/23/2012] [Accepted: 05/01/2012] [Indexed: 11/24/2022]
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Hasegawa C, Kumazawa T, Uchigasaki S, Lee XP, Sato K, Terada M, Kurosaki K. Determination of dextromethorphan in human plasma using pipette tip solid-phase extraction and gas chromatography–mass spectrometry. Anal Bioanal Chem 2011; 401:2215-23. [DOI: 10.1007/s00216-011-5324-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2011] [Revised: 07/25/2011] [Accepted: 08/06/2011] [Indexed: 10/17/2022]
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LIU YJ, WU HL, NIE JF, WANG JY, OUYANG LQ, YU RQ. Simultaneous Determination of Dextromethorphan and Its Metabolite Dextrorphan in Plasma Samples Using Second-order Calibration Coupled with Excitation-Emission Matrix Fluorescence. ANAL SCI 2011; 27:663-6. [DOI: 10.2116/analsci.27.663] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Ya-Juan LIU
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University
| | - Hai-Long WU
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University
| | - Jin-Fang NIE
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University
| | - Jian-Yao WANG
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University
| | - Li-Qun OUYANG
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University
| | - Ru-Qin YU
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University
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Loos WJ, de Graan AJM, de Bruijn P, van Schaik RHN, van Fessem MAC, Lam MH, Mathijssen RHJ, Wiemer EAC. Simultaneous quantification of dextromethorphan and its metabolites dextrorphan, 3-methoxymorphinan and 3-hydroxymorphinan in human plasma by ultra performance liquid chromatography/tandem triple-quadrupole mass spectrometry. J Pharm Biomed Anal 2010; 54:387-94. [PMID: 20926215 DOI: 10.1016/j.jpba.2010.08.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2010] [Revised: 08/30/2010] [Accepted: 08/31/2010] [Indexed: 11/18/2022]
Abstract
A rapid and sensitive ultra performance liquid chromatography/tandem mass spectrometry (UPLC-MS/MS) method has been developed and validated for the simultaneous quantitative determination of dextromethorphan (DM) and its metabolites dextrorphan (DX), 3-methoxymorphinan (3MM) and 3-hydroxymorphinan (3HM), in human lithium heparinized plasma. The extraction involved a simple liquid-liquid extraction with 1 ml n-butylchloride from 200μl aliquots of plasma, after the addition of 20 μl 4% (v/v) ammonium hydroxide and 100 μl stable labeled isotopic internal standards in acetonitrile. Chromatographic separations were achieved on an Aquity UPLC(®) BEH C(18) 1.7 μm 2.1 mm x 100mm column eluted at a flow-rate of 0.250 ml/min on a gradient of acetonitrile. The overall cycle time of the method was 7 min, with elution times of 1.3min for DX and 3HM, 2.8 min for 3MM and 2.9min for DM. The multiple reaction monitoring transitions were set at 272>215 (m/z), at 258>133 (m/z), at 258>213 (m/z) and at 244>157 (m/z) for DM, DX, 3MM and 3HM, respectively. The calibration curves were linear (r²≥0.995) over the range of 0.500-100 nM with the lower limit of quantitation validated at 0.500 nM for all compounds, which is equivalent to 136, 129, 129 and 122 pg/ml for DM, DX, 3MM and 3HM, respectively. Extraction recoveries were constant, but ranged from 39% for DM to 83% for DX. The within-run and between-run precisions were within 11.6%, while the accuracy ranged from 92.7 to 110.6%. The applicability of the bioanalytical method was demonstrated and is currently implemented in a clinical trial to study DM as probe-drug for individualized tamoxifen treatment in breast cancer patients.
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Affiliation(s)
- Walter J Loos
- Department of Medical Oncology, Erasmus MC-Daniel den Hoed Cancer Center, University Medical Center, Rotterdam, The Netherlands.
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Liang X, Li Y, Barfield M, Ji QC. Study of dried blood spots technique for the determination of dextromethorphan and its metabolite dextrorphan in human whole blood by LC–MS/MS. J Chromatogr B Analyt Technol Biomed Life Sci 2009; 877:799-806. [DOI: 10.1016/j.jchromb.2009.02.015] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2009] [Accepted: 02/06/2009] [Indexed: 10/21/2022]
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9
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Eichhold TH, McCauley-Myers DL, Khambe DA, Thompson GA, Hoke SH. Simultaneous determination of dextromethorphan, dextrorphan, and guaifenesin in human plasma using semi-automated liquid/liquid extraction and gradient liquid chromatography tandem mass spectrometry. J Pharm Biomed Anal 2007; 43:586-600. [PMID: 16930908 DOI: 10.1016/j.jpba.2006.07.018] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2006] [Revised: 07/06/2006] [Accepted: 07/07/2006] [Indexed: 11/21/2022]
Abstract
A method for the simultaneous determination of dextromethorphan (DEX), dextrorphan (DET), and guaifenesin (GG) in human plasma was developed, validated, and applied to determine plasma concentrations of these compounds in samples from six clinical pharmacokinetic (PK) studies. Semi-automated liquid handling systems were used to perform the majority of the sample manipulation including liquid/liquid extraction (LLE) of the analytes from human plasma. Stable-isotope-labeled analogues were utilized as internal standards (ISTDs) for each analyte to facilitate accurate and precise quantification. Extracts were analyzed using gradient liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS). Use of semi-automated LLE with LC-MS/MS proved to be a very rugged and reliable approach for analysis of more than 6200 clinical study samples. The lower limit of quantification was validated at 0.010, 0.010, and 1.0 ng/mL of plasma for DEX, DET, and GG, respectively. Accuracy and precision of quality control (QC) samples for all three analytes met FDA Guidance criteria of +/-15% for average QC accuracy with coefficients of variation less than 15%. Data from the thorough evaluation of the method during development, validation, and application are presented to characterize selectivity, linearity, over-range sample analysis, accuracy, precision, autosampler carry-over, ruggedness, extraction efficiency, ionization suppression, and stability. Pharmacokinetic data are also provided to illustrate improvements in systemic drug and metabolite concentration-time profiles that were achieved by formulation optimization.
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Affiliation(s)
- Thomas H Eichhold
- The Procter and Gamble Company, Health Care Research Center, 8700 Mason-Montgomery Road, Mason, OH 45040, USA
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Santagati NA, Gotti R, Ronsisvalle G. Simultaneous determination of phenytoin and dextromethorphan in urine by solid-phase extraction and HPLC-DAD. J Sep Sci 2005; 28:1157-62. [PMID: 16116992 DOI: 10.1002/jssc.200401942] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A rapid and simple high-performance liquid chromatographic method with photodiode array detection was developed for the separation and the simultaneous determination of phenytoin and dextromethorphan in human urine. Analysis was performed in less than 4.5 min in isocratic mode on a reversed-phase C18 column (5 microm; 150 x 4.6 mm) using a mobile phase composed of acetonitrile-buffer phosphate 0.01 M (60:40, v/v) adjusted to pH 6.0, at 1 mL/min flow rate and UV absorbance at 210 nm. The elution order of analytes was dextromethorphan (DXM), Internal Standard (IS), and phenytoin (PHT). Calibration curves were linear in the 7.5-25 microg/mL range for PHT and in the 10-30 microg/mL range for DXM. Spike recoveries for urine samples prepared at three spiking levels ranged from 97.8 to 102.3% for PHT and from 94.8 to 100.4% for DXM. The detection limit (LOD) values ranged from 0.08 microg/mL for PHT to 0.5 microg/mL for DXM. The quantitation limit (LOQ) values ranged from 0.3 microg/mL for PHT to 1.6 microg/mL for DXM. The sample preparation method involves a rapid and simple procedure based on solid-phase extraction using a C18 reversed-phase column. Validation of the optimised method was carried out according to the ICH guidelines. The method developed in this study allows the reliable simultaneous analysis of PHT and DXM, drugs that were never quantified together in previously reported analytical methods. The described method has the advantage of being rapid and easy and it could be applied in therapeutic monitoring of these drugs in human urine of epileptic patients.
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Affiliation(s)
- Natale Alfredo Santagati
- Dipartimento di Scienze Farmaceutiche, Facoltà di Farmacia, Università di Catania, Catania, Italy.
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11
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Kuhlenbeck DL, Eichold TH, Hoke SH, Baker TR, Mensen R, Wehmeyer KR. On-line solid phase extraction using the Prospekt-2 coupled with a liquid chromatography/tandem mass spectrometer for the determination of dextromethorphan, dextrorphan and guaifenesin in human plasma. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2005; 11:199-208. [PMID: 16046804 DOI: 10.1255/ejms.737] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
An on-line liquid chromatography/tandem mass spectrometry (LC-MS/MS) procedure, using the Prospekt- 2 system, was developed and used for the determination of the levels of the active ingredients of cough/cold medications in human plasma matrix. The experimental configuration allows direct plasma injection by performing on- line solid phase extraction (SPE) on small cartridge columns prior to elution of the analyte(s) onto the analytical column and subsequent MS/MS detection. The quantitative analysis of three analytes with differing polarities, dextromethorphan (DEX), dextrorphan (DET) and guaifenesin (GG) in human plasma presented a significant challenge. Using stable-isotope-labeled internal standards for each analyte, the Prospekt-2 on-line methodology was evaluated for sensitivity, suppression, accuracy, precision, linearity, analyst time, analysis time, cost, carryover and ease of use. The lower limit of quantitation for the on-line SPE procedure for DEX, DET and GG was 0.05, 0.05 and 5.0 ng mL(-1), respectively, using a 0.1 mL sample volume. The linear range for DEX and DET was 0.05-50 ng mL(-1) and was 5-5,000 ng mL(-1) for GG. Accuracy and precision data for five different levels of QC samples were collected over three separate days. Accuracy ranged from 90% to 112% for all three analytes, while the precision, as measured by the %RSD, ranged from 1.5% to 16.0%
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Affiliation(s)
- Debbie L Kuhlenbeck
- Procter & Gamble Pharmaceuticals, Health Care Research Center, 8700 Mason-Montgomery Rd, Mason, OH 45040-8006, USA
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12
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Afshar M, Rouini MR, Amini M. Simple chromatography method for simultaneous determination of dextromethorphan and its main metabolites in human plasma with fluorimetric detection. J Chromatogr B Analyt Technol Biomed Life Sci 2004; 802:317-22. [PMID: 15018793 DOI: 10.1016/j.jchromb.2003.12.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2003] [Revised: 10/20/2003] [Accepted: 12/12/2003] [Indexed: 11/18/2022]
Abstract
Dextromethorphan, the innocuous non-narcotic antitussive agent, is the most widely used probe drug to assess CYP2D6 function both in vivo and in vitro. For this reason a simple and selective high performance liquid chromatography method with fluorimetric detection for simultaneous quantitation of dextromethorphan, and its main metabolites in human plasma was developed and validated. The method involved a simple and rapid protein precipitation protocol, using a mixture of ZnSO(4) and methanol. The analysis was performed on a 3 microm, C(18) Tracer Excel 15 cm x 0.4 cm i.d. column by gradient elution in which Mobile phase A consisted of potassium dihydrogen phosphate buffer (pH = 3, 0.01 M):methanol:tetrahydrofuran (68.5:31:0.5), and mobile phase B consisted of methanol:tetrahydrofuran (93.25:6.75). Linear calibration curves were obtained in the range of 10-500 ng/ml for dextromethorphan, dextrorphan and hydroxymorphinan. The limit of quantitation (LOQ) was 10 ng/ml for each compound. The maximum within and between days precisions were 7.4 and 7.8%, respectively. The accuracies at four different concentration levels ranged from 88.2 to 111.5%. The recoveries were between 88.0 and 108.6%. The assay method was successfully applied to determine dextromethorphan metabolic ratio after an oral dose of 30 mg of dextromethorphan hydrobromide.
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Affiliation(s)
- Minoo Afshar
- Biopharmaceutics and Pharmacokinetics Division, Department of Pharmaceutics, Faculty of Pharmacy, Tehran University of Medical Sciences, 14155-6451 Tehran, Iran
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Streel B, Zimmer C, Sibenaler R, Ceccato A. Simultaneous determination of nifedipine and dehydronifedipine in human plasma by liquid chromatography-tandem mass spectrometry. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1998; 720:119-28. [PMID: 9892074 DOI: 10.1016/s0378-4347(98)00423-x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Quantitative analysis of therapeutic compounds and their metabolites in biological matrix (such as plasma, serum or urine) nowadays requires sensitive and selective methods to allow the determination of concentrations in the ng/ml range. A new on-line LC-MS-MS method using atmospheric pressure chemical ionisation (APCI) as interface for the simultaneous determination of nifedipine (NIF) and its metabolite in human plasma, dehydronifedipine (DNIF) has been developed. The compounds were extracted from plasma using solid-phase extraction (SPE) on disposable extraction cartridges (DECs). The SPE operations were performed automatically by means of a sample processor equipped with a robotic arm (ASPEC system). The DEC filled with phenyl modified silica was first conditioned with methanol and water. The washing step was performed with water. Finally, the analytes were successively eluted with methanol and water. The liquid chromatographic (LC) separation of NIF and DNIF was achieved on a RP-18 stationary phase (4 microm). The mobile phase consisted of methanol-50 mM ammonium acetate solution (50:50, v/v). The LC was then coupled to tandem mass spectrometry with an APCI interface in the positive ion mode. The method developed was validated. The absolute recoveries evaluated over the whole concentration range were 95+/-2% and 95+/-4% for NIF and DNIF, respectively. The method was found to be linear in the 0.5-100 ng/ml concentration range for the two analytes (r2 = 0.999 for both NIF and DNIF). The mean R.S.D. values for repeatability and intermediate precision were 2.9 and 3.0% for NIF and 2.2-4.7% for the metabolite. The method developed was successfully used to investigate the plasma concentration of NIF and DNIF in the pharmacokinetic studies.
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Affiliation(s)
- B Streel
- S.M.B. Laboratories R&D (Galephar), Brussels, Belgium
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Streel B, Ceccato A, Peerboom C, Zimmer C, Sibenaler R, Maes P. Determination of molsidomine and its active metabolite in human plasma using liquid chromatography with tandem mass spectrometric detection. J Chromatogr A 1998; 819:113-23. [PMID: 9781417 DOI: 10.1016/s0021-9673(98)00323-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Pharmacokinetic studies of molsidomine require a sensitive analytical method to allow the determination of concentrations of this compound and its active metabolite 3-morpholinosydnonimine (Sin-1) in the ng/ml range in plasma. The method developed is based on on-line LC-MS-MS using pneumatically assisted electrospray ionisation as an interface, preceded by off-line solid-phase extraction (SPE) on disposable extraction cartridges (DECs). The SPE operations were performed automatically by means of a sample processor equipped with a robotic arm (automated sample preparation with extraction cartridges; ASPEC system). The DEC, filled with phenyl-modified silica, was first conditioned with methanol and water. The washing step was performed with water. Finally, the analytes were successively eluted with methanol containing formic acid (0.2%) and water. The liquid chromatographic separation of molsidomine and Sin-1 was achieved on an RP-8 stationary phase (5 microns). The mobile phase was a mixture of methanol-water-formic acid (65:35:0.1, v/v/v). The HPLC system was then coupled to a MS-MS system with an atmospheric pressure ionisation interface in the positive ion mode. The chromatographed analytes were detected in the multiple reaction monitoring mode. The MS-MS ion transitions monitored were (m/z) 243-->86 for molsidomine and 171-->86 for Sin-1. The method developed was validated. The absolute recoveries evaluated over the whole concentration range were 74 +/- 3 and 55 +/- 5% for molsidomine and Sin-1, respectively. The method was found to be linear in the 0.5-50 ng/ml concentration range for the two analytes (r2 = 0.999 for both molsidomine and Sin-1). The mean RSD values for repeatability and intermediate precision were 3.4 and 4.8% for moldsidomine and 3.1-7.7% for the metabolite. The method developed was successfully used to investigate the bioequivalence of oral doses of molsidomine between a generic tablet and a reference product.
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Affiliation(s)
- B Streel
- S.M.B. Laboratories R&D, Galephar, Brussels, Belgium
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Ayrton J, Dear GJ, Leavens WJ, Mallett DN, Plumb RS. Use of generic fast gradient liquid chromatography-tandem mass spectroscopy in quantitative bioanalysis. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1998; 709:243-54. [PMID: 9657221 DOI: 10.1016/s0378-4347(98)00074-7] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Short narrow analytical HPLC columns have been used successfully with high linear flow-rates and combined with mass spectrometric detection to produce a generic approach to quantitative bioanalysis. The approach has been used to validate several assays in the low ng/ml region and an example is given in this paper. When combined with a simple solid-phase extraction process the need for complicated, time consuming method development has been removed for the majority of pharmaceutical compounds. The approach takes advantage of not only the extra selectivity of the MS-MS detector but the excellent resolution and peak shape produced by gradient elution.
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Affiliation(s)
- J Ayrton
- International Development, Bioanalysis and Drug Metabolism Division, GlaxoWellcome Research and Development, Ware, Herts, UK
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