1
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Mao G, Zhao K, Sun S, Lu Y, Li X. A new derivatization method for the determination of valproic acid in serum using tetramethylammonium hydroxide as a catalyst. Biomed Chromatogr 2018; 33:e4440. [PMID: 30456910 DOI: 10.1002/bmc.4440] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 11/03/2018] [Accepted: 11/13/2018] [Indexed: 11/05/2022]
Affiliation(s)
- Guifu Mao
- Department of PharmacyLiuzhou Traditional Chinese Medical Hospital Guangxi People's Republic of China
| | - Kun Zhao
- Department of PharmacyBeijing Friendship Hospital Pinggu Campus, Capital Medical University Beijing People's Republic of China
| | - Shusen Sun
- College of Pharmacy and Health SciencesWestern New England University Springfield Massachusetts USA
| | - Yanxia Lu
- Department of PharmacyThe General Hospital of the Chinese People's Armed Police Forces Beijing People's Republic of China
| | - Xingang Li
- Department of PharmacyBeijing Tiantan Hospital, Capital Medical University Beijing People's Republic of China
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2
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A simple and sensitive methodology for voltammetric determination of valproic acid in human blood plasma samples using 3-aminopropyletriethoxy silane coated magnetic nanoparticles modified pencil graphite electrode. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 76:425-430. [DOI: 10.1016/j.msec.2017.02.140] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2016] [Revised: 12/11/2016] [Accepted: 02/24/2017] [Indexed: 02/04/2023]
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3
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Wu CY, Hsieh TJ, Tseng WL, Keng CL, Lu CY. Valproic acid analysis by mass spectrometry part I: enhanced determination of valproic acid by microwave assisted chemical labeling. RSC Adv 2016. [DOI: 10.1039/c5ra25416g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Schematic diagram of the proposed method for valproic acid (VA) analysis by MALDI-TOF MS.
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Affiliation(s)
- Chun-Yi Wu
- Department of Biochemistry
- College of Medicine
- Kaohsiung Medical University
- Kaohsiung 80708
- Taiwan
| | - Tusty-Jiuan Hsieh
- Graduate Institute of Medicine
- College of Medicine
- Kaohsiung Medical University
- Kaohsiung 80708
- Taiwan
| | - Wei-Lung Tseng
- Department of Chemistry
- College of Science
- National Sun Yat-sen University
- Kaohsiung 80424
- Taiwan
| | - Chun-Lan Keng
- Research Center for Environmental Medicine
- Kaohsiung Medical University
- Kaohsiung 80708
- Taiwan
| | - Chi-Yu Lu
- Department of Biochemistry
- College of Medicine
- Kaohsiung Medical University
- Kaohsiung 80708
- Taiwan
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4
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Wu CY, Lu CY. Derivatization oriented strategy for enhanced detection of valproic acid and its metabolites in human plasma and detection of valproic acid induced reactive oxygen species associated protein modifications by mass spectrometry. J Chromatogr A 2014; 1374:14-22. [DOI: 10.1016/j.chroma.2014.11.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Revised: 11/02/2014] [Accepted: 11/11/2014] [Indexed: 10/24/2022]
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5
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Darlington DN, Gonzales MD. HPLC DETERMINATION OF VALPROIC ACID IN PLASMA BY CONJUGATION TO A HYDRAZIDE. J LIQ CHROMATOGR R T 2013. [DOI: 10.1080/10826076.2012.717059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
| | - Mary D. Gonzales
- a US Army Institute of Surgical Research , San Antonio , Texas , USA
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6
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Determination of free and total valproic acid in human plasma by capillary electrophoresis with contactless conductivity detection. J Chromatogr B Analyt Technol Biomed Life Sci 2012; 907:74-8. [DOI: 10.1016/j.jchromb.2012.08.037] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Revised: 08/27/2012] [Accepted: 08/29/2012] [Indexed: 11/21/2022]
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7
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Hwang K, Song SS, Lee JH, Shin MC, Seo JS. Development and validation of an LC/MS/MS method for determination of valproic acid and its metabolite 2-propyl-4-pentenoic acid in monkey plasma. ACTA ACUST UNITED AC 2012. [DOI: 10.1007/s13765-012-0003-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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8
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Proença P, Franco JM, Mustra C, Marcos M, Pereira AR, Corte-Real F, Vieira DN. An UPLC–MS/MS method for the determination of valproic acid in blood of a fatal intoxication case. J Forensic Leg Med 2011; 18:320-4. [DOI: 10.1016/j.jflm.2011.06.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Accepted: 06/15/2011] [Indexed: 12/24/2022]
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9
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Sobhi HR, Kashtiaray A, Farahani H, Abrahimpour F, Esrafili A. Quantitation of valproic acid in pharmaceutical preparations using dispersive liquid-liquid microextraction followed by gas chromatography-flame ionization detection without prior derivatization. Drug Test Anal 2010; 2:362-6. [PMID: 20836145 DOI: 10.1002/dta.131] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Dispersive liquid-liquid microextraction (DLLME), coupled with gas chromatography-flame ionization detection (GC-FID), has been successfully used for the extraction and determination of valproic acid (VPA) in pharmaceutical preparations. In the developed method, an appropriate mixture of extracting and disperser solvents was rapidly injected into an aqueous sample. Having formed a cloudy solution, the mixture was centrifuged and then the extracting solvent was sedimented at the bottom of a conical test tube. The extract was then injected into a GC system directly, without any further pretreatment. Initially, microextraction efficiency factors were optimized and the optimum experimental conditions found were as follows: tetrachloroethylene (9.0 µL) as extracting solvent; acetone (1.0 mL) as disperser solvent; 5 mL acidic aqueous sample (pH 1) without salt addition. Under the selected conditions, the calibration curve showed linearity in the range of 0.1-5.0 mg/L with regression coefficient corresponding to 0.9998. The limit of detection was found to be 0.05 mg/L. Finally, the method was applied for the determination of VPA in two different pharmaceutical preparations. A reasonable intra-assay (3.9-10.8%, n = 3) and inter-assay (5.6-11.4%, n = 3) precision illustrated the good performance of the analytical procedure. The protocol proved to be rapid and cost-effective for screening purposes.
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Affiliation(s)
- Hamid Reza Sobhi
- Department of Chemistry, Tehran Payamenoor University, Tehran, Iran.
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10
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Subasranjan A, Suresh P, Srinivasulu C, Hemant R. A validated stability-indicating gas chromatography method for determination of divalproex sodium impurities in pharmaceutical preparation. Drug Test Anal 2010; 2:182-7. [DOI: 10.1002/dta.117] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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11
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FARAJZADEH MA, FARHADI K, MATIN AA, HASHEMI P, JOUYBAN A. Headspace Solid-Phase Microextraction-Gas Chromatography Method for the Determination of Valproic Acid in Human Serum, and Formulations Using Hollow-Fiber Coated Wire. ANAL SCI 2009; 25:875-9. [DOI: 10.2116/analsci.25.875] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Mir Ali FARAJZADEH
- Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz
| | - Khalil FARHADI
- Department of Chemistry, Faculty of Science, Urmia University
| | - Amir A. MATIN
- Department of Chemistry, Faculty of Science, Urmia University
- Research Department of Chromatography, Iranian Academic Center for Education, Culture & Research (ACECR)
| | - Paria HASHEMI
- Department of Chemistry, Faculty of Science, Urmia University
| | - Abolghasem JOUYBAN
- School of Pharmacy & Drug Applied Research Center, Tabriz University of Medical Sciences
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12
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Shahdousti P, Mohammadi A, Alizadeh N. Determination of valproic acid in human serum and pharmaceutical preparations by headspace liquid-phase microextraction gas chromatography-flame ionization detection without prior derivatization. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 850:128-33. [PMID: 17157566 DOI: 10.1016/j.jchromb.2006.11.013] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2006] [Revised: 10/28/2006] [Accepted: 11/10/2006] [Indexed: 11/17/2022]
Abstract
An efficient and fast extraction technique for the enrichment of valproic acid from human blood serum samples using the headspace liquid phase microextraction (HS-LPME) combined with gas chromatography (GC) analysis has been developed. The extraction was conducted by suspending a 2 microL drop of organic solvent in a 1 mL serum sample; following 20 min of extraction, withdrawing organic solvent into a syringe and injection into a GC with a flame ionization detector (FID), without any further pre-treatment. Four organic solvents, 1-decanole, benzyl alcohol, 1-octanol and n-dodecane, were studied as extractants, and n-dodecane was found to be the most sensitive solvent for valproic acid. The results revealed that HS-LPME is suitable for the successful extraction of valproic acid from human blood serum samples. Parameters like extraction time, ionic strength, pH, organic solvent volume, and temperature of the sample were studied and optimized to obtain the best extraction results. An enrichment factor of 27-fold was achieved in 20 min. The procedure resulted in a relative standard deviation of <13.2% (n=7) and a linear calibration range from 2 to 20 microg mL(-1) (r>0.98), and the limit of detection was 0.8 microg mL(-1) in serum blank samples. Overall, LPME proved to be a fast, sensitive and simple tool for the preconcentration of valproic acid from real samples. The proposed method was also applied to the analysis of valproate in pharmaceutical preparations.
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Affiliation(s)
- Parvin Shahdousti
- Department of Chemistry, Faculty of Science, Tarbiat Modarres University, P.O. Box 14115-175, Tehran, Iran
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13
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Belin GK, Krähenbühl S, Hauser PC. Direct determination of valproic acid in biological fluids by capillary electrophoresis with contactless conductivity detection. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 847:205-9. [PMID: 17070114 DOI: 10.1016/j.jchromb.2006.10.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2006] [Revised: 09/25/2006] [Accepted: 10/07/2006] [Indexed: 01/08/2023]
Abstract
Capacitively coupled contactless conductivity detection (C(4)D) is a new technique providing high sensitivity in capillary electrophoresis (CE) especially for small ions that can otherwise only be determined with indirect methods. In this work, direct determination and validation of valproic acid (VPA) in biological fluids was achieved using CE with C(4)D. VPA is of pharmacological interest because of its use in epilepsy and bipolar disorder. The running electrolyte solution used consisted of 10mM 2-(N-morpholino)ethane sulfonic acid (MES)/dl-histidine (His) and 50microM hexadecyltrimethylammonium bromide (HTAB) at pH 6.0. Caproic acid (CA) was selected as internal standard (IS). Analyses of VPA in serum, plasma and urine samples were performed in less than 3min. The interference of the sample matrix was reduced by deproteinization of the sample with acetonitrile (ACN). The effect of the solvent type and ratio on interference was investigated. The limits of detection (LOD) and quantitation (LOQ) of VPA in plasma samples were determined as 24 and 80ng/ml, respectively. The method is linear between the 2 and 150microg/ml, covering well the therapeutic range of VPA (50-100microg/ml).
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Affiliation(s)
- Gamze Kavran Belin
- Laboratory of Mass Spectrometry, Department of Chemistry, University of Geneva, Sciences I, Geneva 4, Switzerland.
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14
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Lau-Cam CA, Roos RW. High Performance Liquid Chromatographic Method for the Assay of Undecylenic Acid and Undecylenates in Pharmaceutical Products After Conversion to 4′-Nitrophenacyl Esters. J LIQ CHROMATOGR R T 2006. [DOI: 10.1080/10826079808001237] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- C. A. Lau-Cam
- a College of Pharmacy and Allied Health Professions St. John's University , Jamaica, New York, 11439
| | - R. W. Roos
- a College of Pharmacy and Allied Health Professions St. John's University , Jamaica, New York, 11439
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15
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Lau-Cam CA, Roos RW. HPLC Method with Precolumn Phenacylation for the Assay of Valproic Acid and Its Salts in Pharmaceutical Dosage Forms. J LIQ CHROMATOGR R T 2006. [DOI: 10.1080/10826079708005566] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- C. A. Lau-Cam
- a College of Pharmacy and Allied Health Professions , St. John's University , Jamaica, New York, 11439
| | - R. W. Roos
- a College of Pharmacy and Allied Health Professions , St. John's University , Jamaica, New York, 11439
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16
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Deng C, Li N, Ji J, Yang B, Duan G, Zhang X. Development of water-phase derivatization followed by solid-phase microextraction and gas chromatography/mass spectrometry for fast determination of valproic acid in human plasma. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2006; 20:1281-7. [PMID: 16548053 DOI: 10.1002/rcm.2451] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
In this study, a simple, rapid, and sensitive method was developed and validated for the quantification of valproic acid (VPA), an antiepileptic drug, in human plasma, which was based on water-phase derivatization followed by headspace solid-phase microextraction (HS-SPME) and gas chromatography/mass spectrometry (GC/MS). In the proposed method, VPA in plasma was rapidly derivatized with a mixture of isobutyl chloroformate, ethanol and pyridine under mild conditions (room temperature, aqueous medium), and the VPA ethyl ester formed was headspace-extracted and simultaneously concentrated using the SPME technique. Finally, the analyte extracted on SPME fiber was analyzed by GC/MS. The experimental parameters and method validations were studied. The optimal conditions were obtained: PDMS fiber, stirring rate of 1100 rpm, sample temperature of 80 degrees C, extraction time of 20 min, NaCl concentration of 30%. The proposed method had a limit of quantification (0.3 microg/mL), good recovery (89-97%) and precision (RSD value less than 10%). Because the proposed method combined a rapid water-phase derivatization with a fast, simple and solvent-free sample extraction and concentration technique of SPME, the sample preparation time was less than 25 min. This much shortens the whole analysis time of VPA in plasma. The validated method has been successfully used to analyze VPA in human plasma samples for application in pharmacokinetic studies. All these results show that water-phase derivatization followed by HS-SPME and GC/MS is an alternative and powerful method for fast determination of VPA in biological fluids.
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Affiliation(s)
- Chunhui Deng
- Department of Chemistry, Fudan University, Shanghai 200433, China
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17
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Zhong Y, Jiao Z, Yu Y. Simultaneous determination of mycophenolic acid and valproic acid based on derivatization by high-performance liquid chromatography with fluorescence detection. Biomed Chromatogr 2006; 20:319-26. [PMID: 16145659 DOI: 10.1002/bmc.566] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A reliable and validated reversed-phase high-performance liquid chromatography (HPLC) method using fluorescence detection is reported for the simultaneous quantitation of mycophenolic acid (MPA) and valproic acid (VPA) in human plasma. The method is based on the pre-column derivatization of valproic acid with 4-bromomethyl-6, 7-dimethoxycoumarin (BrMMC) and online solvatochromism of MPA by pH adjustment. The linear calibration range was 0.50-30 microg/mL for MPA and 5.00-150 microg/mL for VPA. The relative standard deviations of the method of intra- and inter-day analyses (n = 6) were below 6.5 and 6.7% for MPA, and 5.8 and 6.3% for VPA, respectively. Dichloromethane was used for the simultaneous extraction of MPA and VPA from acidified plasma. This reliable method can be applied in the analysis of MPA and VPA in human plasma using only a small volume (100 microL).
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Affiliation(s)
- Yan Zhong
- School of Pharmacy, Fudan University, Shanghai 200032, People's Republic of China
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18
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Alsarra IA, Al-Omar M, Belal F. Valproic Acid and sodium valproate: comprehensive profile. PROFILES OF DRUG SUBSTANCES, EXCIPIENTS, AND RELATED METHODOLOGY 2005; 32:209-40. [PMID: 22469088 DOI: 10.1016/s0099-5428(05)32008-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Affiliation(s)
- Ibrahim A Alsarra
- Department of Pharmaceutics, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Kingdom of Saudi Arabia
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19
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Pucci V, Monteagudo E, Bonelli F. High sensitivity determination of valproic acid in mouse plasma using semi-automated sample preparation and liquid chromatography with tandem mass spectrometric detection. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2005; 19:3713-8. [PMID: 16299698 DOI: 10.1002/rcm.2249] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
A high-throughput liquid chromatography/electrospray ionization tandem mass spectrometry (LC/ESI-MS/MS) assay using automated sample preparation has been developed for the determination of valproic acid (VPA) in mouse plasma. A liquid-handling system was programmed to prepare calibration standard solutions in plasma, as well as quality controls and clinical samples. Plasma protein precipitation was performed on a 96-well plate, and the collected supernatant was directly injected into a reversed-phase LC/ESI-MS/MS system in the negative ionization mode. The calibration curve for VPA was linear over a dynamic range of 0.15-100 microg/mL. The limit of detection was 75 ng/mL and the lower limit of quantitation was 150 ng/mL. Intra- and inter-day validation assays of the semi-automated plasma analysis showed satisfactory accuracy and precision.
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Affiliation(s)
- Vincenzo Pucci
- Istituto di Ricerche di Biologia Molecolare P. Angeletti, Merck Sharp and Dohme Research Laboratories, Via Pontina km 30.600, 00040 Pomezia, Roma, Italy
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Pucci V, Mandrioli R, Raggi MA. Determination of valproic acid (2-propylpentanoic acid) in human plasma by capillary electrophoresis with indirect UV detection. Electrophoresis 2003; 24:2076-2083. [PMID: 12858378 DOI: 10.1002/elps.200305405] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A rapid capillary zone electrophoresis method with indirect UV detection was developed and validated for the determination of valproic acid (VPA) in human plasma. The analyses were carried out under optimized conditions, using a buffer system composed of 15 mM benzoate and 0.5 mM cetyltrimethylammonium bromide at pH 6.0, and 25% v/v methanol; 2-hydroxybutyric acid was selected as the internal standard (IS). The capillary electrophoresis (CE) separation was carried out at a negative potential of 30 kV and the indirect UV detection was operated at 210 +/- 20 nm for all assays. The influence of buffer pH, ionic strength, concentration of electroosmotic flow (EOF) modifier and organic modifier on indirect signal response and migration behavior of the organic acid was investigated. Isolation of VPA from plasma was accomplished by a carefully implemented procedure using methanol as the precipitant agent. Using a high ratio of methanol to plasma for deproteinization (4:1), good absolute recovery of the analyte and satisfactory selectivity was obtained. The calibration line for VPA was linear over the 1-100 microg/mL concentration range. Sensitivity was high; in fact, the limit of detection (LOD) of VPA was 150 ng/mL and 450 ng/mL the limit of quantitation (LOQ). The results obtained analyzing real plasma samples from schizophrenic patients under polytherapy with VPA as well as antipsychotic drugs were satisfactory in terms of precision, accuracy and sensitivity.
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Affiliation(s)
- Vincenzo Pucci
- Department of Pharmaceutical Sciences, University of Bologna, Bologna, Italy
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Chollet DF. Determination of antiepileptic drugs in biological material. J Chromatogr B Analyt Technol Biomed Life Sci 2002; 767:191-233. [PMID: 11885851 DOI: 10.1016/s0378-4347(01)00502-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Current analytical methodologies applied to the determination of antiepileptic drugs in biological material are reviewed. The role of chromatographic techniques is emphasized. Special attention is focused on new chemical entities as well as current trends such as high-speed liquid chromatographic techniques, hyphenated techniques and electrochromatography techniques. A review with 542 references.
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Affiliation(s)
- Daniel F Chollet
- Covance Central Laboratory Services SA, Drug Monitoring Department, Meyrin/Geneva, Switzerland.
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Abstract
A capillary electrophoresis (CE) method with indirect laser-induced fluorescence detection for the analysis of valproic acid in human serum has been explored. The buffer system was optimized with 2.5 mM borate-phosphate at pH 8.4; fluorescein sodium was used to generate background signal at a concentration of 6 microM. Hexanoic acid was selected as internal standard. Serum sample was deproteinized by acetonitrile. Analysis was performed by direct injection of the supernatant. CE separation was carried out at 30 kV and the total analysis time was less than 15 min, including sample treatment and electrophoresis time. No interference from other common anticonvulsant drugs occurred under the experimental conditions used. The interference of human serum matrix was reduced by using a high ratio of acetonitrile to serum (minimum 5:1) for deproteinization. Interference of ionic components in serum could occur, depending on the sample source. The linear range of concentrations for standard drug was between 4.5-144.0 microg/mL (r = 0.9947). The limit of detection was 0.9 microg/mL at S/N > or = 3; the limit of quantitation at S/N > or = 20 was 3 microg/mL. The recoveries of valproic acid spiked into serum were 69.2% and 60.2% for concentration levels of 90 and 54 microg/mL, respectively. This CE method was shown to be successful in the analysis of valproic acid in standard solutions. However, interference from the matrix was observed in the analysis of this compound in serum samples. Additional work should be done to develop a highly selective sample preparation technique.
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Affiliation(s)
- L J Jin
- Department of Chemistry, National University of Singapore, Republic of Singapore
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23
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Carlin A, Simmons J. Assay for valproic acid and its E-delta2 metabolite in rat plasma by capillary gas chromatography without prior derivatization. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1997; 694:115-21. [PMID: 9234854 DOI: 10.1016/s0378-4347(97)00110-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A new and improved gas chromatographic assay method for valproic acid and a metabolite, E-delta2 valproic acid, in rat plasma has been developed. The assay has sufficient sensitivity to measure free levels of the parent drug and metabolite. By employing a Stabilwax-DA capillary column, symmetrical chromatographic peaks were obtained without the need for prior derivatization. Standard curves for valproic acid were linear from 0.1 to 640 microg/ml. Standard curves for the metabolite were linear from 0.1 to 556 microg/ml.
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Affiliation(s)
- A Carlin
- Biopharmaceutics Research Branch, Center for Drug Evaluation and Research, Food and Drug Administration, Rockville, MD 20850, USA
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Lucarelli C, Villa P, Lombaradi E, Prandini P, Brega A. HPLC method for the simultaneous analysis of valproic acid and other common anticonvulsant drugs in human plasma or serum. Chromatographia 1992. [DOI: 10.1007/bf02276848] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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25
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Fazio A, Perucca E, Pisani F. Liquid Chromatographic Analysis of Antiepileptic Drugs: An Overview. ACTA ACUST UNITED AC 1990. [DOI: 10.1080/01483919008049566] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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26
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Lovett LJ, Nygard GA, Erdmann GR, Burley CZ, Wahba Khalil SK. HPLC Determination of Valproic Acid in Human Serum Using Ultraviolet Detection. ACTA ACUST UNITED AC 1987. [DOI: 10.1080/01483918708069019] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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27
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Juergens U. HPLC Analysis of Antiepileptic Drugs in Blood Samples: Microbore Separation of Fourteen Compounds. ACTA ACUST UNITED AC 1987. [DOI: 10.1080/01483918708066732] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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28
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Itoh H, Shinbori Y, Tamura N. Ion-Chromatographic Determination of Valproic Acid. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1986. [DOI: 10.1246/bcsj.59.997] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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