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Dogra A, Sharma A, Kumar Mandal U, Kotwal P, Bhatt S, Nandi U. Liquid Chromatography Based Methods for Analysis of Disease-Modifying Antirheumatic Drugs (DMARDs) in Biological Matrices. Crit Rev Anal Chem 2019; 49:224-242. [DOI: 10.1080/10408347.2018.1503943] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Ashish Dogra
- PK-PD, Toxicology and Formulation Division, CSIR-Indian Institute of Integrative Medicine, Jammu & Kashmir, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu & Kashmir, India
| | - Anjna Sharma
- PK-PD, Toxicology and Formulation Division, CSIR-Indian Institute of Integrative Medicine, Jammu & Kashmir, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu & Kashmir, India
| | - Uttam Kumar Mandal
- Department of Pharmaceutical Sciences & Technology, Maharaja Ranjit Singh Punjab Technical University, Punjab, India
| | - Pankul Kotwal
- PK-PD, Toxicology and Formulation Division, CSIR-Indian Institute of Integrative Medicine, Jammu & Kashmir, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu & Kashmir, India
| | - Shipra Bhatt
- PK-PD, Toxicology and Formulation Division, CSIR-Indian Institute of Integrative Medicine, Jammu & Kashmir, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu & Kashmir, India
| | - Utpal Nandi
- PK-PD, Toxicology and Formulation Division, CSIR-Indian Institute of Integrative Medicine, Jammu & Kashmir, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu & Kashmir, India
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A reversed-phase high performance liquid chromatography method for quantification of methotrexate in cancer patients serum. J Chromatogr B Analyt Technol Biomed Life Sci 2015; 1002:107-12. [DOI: 10.1016/j.jchromb.2015.08.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 08/11/2015] [Accepted: 08/12/2015] [Indexed: 11/20/2022]
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3
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Janíková-Bandžuchová L, Šelešovská R. Determination of Methotrexate at a Silver Solid Amalgam Electrode by Differential Pulse Voltammetry. ANAL LETT 2015. [DOI: 10.1080/00032719.2014.996812] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Begas E, Papandreou C, Tsakalof A, Daliani D, Papatsibas G, Asprodini E. Simple and Reliable HPLC Method for the Monitoring of Methotrexate in Osteosarcoma Patients. J Chromatogr Sci 2013; 52:590-5. [DOI: 10.1093/chromsci/bmt081] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Emara S, Masujima T, Zarad W, Kamal M, El-Bagary R. On-line coupling of derivatization with pre-concentration to determine trace levels of methotrexate. J Pharm Anal 2013; 3:28-35. [PMID: 29403793 PMCID: PMC5760918 DOI: 10.1016/j.jpha.2012.10.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Accepted: 10/17/2012] [Indexed: 12/09/2022] Open
Abstract
A new simple, sensitive and precise green analytical procedure using an automated packed-reactor derivatization technique coupled with on-line solid-phase enrichment (SPEn) has been developed and evaluated to determine trace levels of methotrexate (MTX). The method was based on injection of MTX into a flowing stream of phosphate buffer (0.04 M, pH 3.4), carried through the packed oxidant reactor of Cerium (IV) trihydroxyhydroperoxide for oxidative cleavage of the drug into highly fluorescent product, 2,4-diaminopteridine-6-carboxylic acid, followed by SPEn on a head of short ODS column (10 mm×4.6 mm i.d., 5 μm particle size). The flow rate was 0.25 mL/min and packed reactor temperature was 40 °C. The trapped product was back-flush eluted from the ODS column to the detector by column-switching with an environmentally friendly mobile phase consisting of ethanol and phosphate buffer (0.04 M, pH 3.4) in the ratio of 5:95 (v/v). The eluent was monitored at emission and excitation wavelengths of 460 and 360 nm, respectively. The calibration curve was linear over the concentration range of 1.25–50 ng/mL with a detection limit of 0.08 ng/mL. The method was successfully applied to determine MTX in pharmaceutical formulations with mean percentage recovery ranging from 99.48 to 99.60.
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Affiliation(s)
- Samy Emara
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Misr International University, Km 28 Ismailia Road, Cairo, Egypt
| | - Tsutomu Masujima
- Analytical Molecular Medicine and Devices Laboratory, Hiroshima University, Graduate School of Biomedical Sciences, 1-2-3, Kasumi, Minami-ku, Hiroshima 734-8551, Japan
| | - Walaa Zarad
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Misr International University, Km 28 Ismailia Road, Cairo, Egypt
| | - Maha Kamal
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Modern Sciences and Arts University, 26 July Mehwar Road intersection with Wahat Road, 6 October City, Egypt
| | - Ramzia El-Bagary
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Cairo University, Kasr El Aini St., Cairo 11562, Egypt
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Determination of erythrocyte methotrexate polyglutamates by liquid chromatography/tandem mass spectrometry after low-dose methotrexate therapy in Chinese patients with rheumatoid arthritis. J Chromatogr B Analyt Technol Biomed Life Sci 2012; 907:41-8. [DOI: 10.1016/j.jchromb.2012.08.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2012] [Revised: 08/20/2012] [Accepted: 08/24/2012] [Indexed: 11/22/2022]
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Wang S, Qi Z, Huang H, Ding H. Electrochemical Determination of Methotrexate at a Disposable Screen-Printed Electrode and Its Application Studies. ANAL LETT 2012. [DOI: 10.1080/00032719.2012.677790] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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8
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A U–HPLC–ESI–MS/MS–Based Stable Isotope Dilution Method for the Detection and Quantitation of Methotrexate in Plasma. Ther Drug Monit 2012; 34:432-9. [DOI: 10.1097/ftd.0b013e31825bb368] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Ultrafast selective quantification of methotrexate in human plasma by high-throughput MALDI-isotope dilution mass spectrometry. Bioanalysis 2011; 3:1369-78. [PMID: 21679031 DOI: 10.4155/bio.11.113] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND A new analytical MS method using isotope dilution combined with MALDI-triple quadrupole MS/MS has been developed and validated for the determination of methotrexate and 7-hydroxymethotrexate in plasma. Methotrexate, methotrexate-d3, 7-hydroxymethotrexate and 7-hydroxymethotrexate-d3 were monitored by selected reaction monitoring using the transitions m/z 455.2→308.2, 458.2→311.2, 471.2→324.2 and 474.2→327.2 for methotrexate, methotrexate-d3, 7-hydroxymethotrexate and 7-hydroxymethotrexate-d3, respectively. RESULTS The LLOQ was 1 nmol/l for methotrexate and 7-hydroxymethotrexate while the limit of detection was 0.3 nmol/l for both analytes. The new developed method was cross-validated by a fluorescence polarization immunoassay and tested for its clinical feasibility by measuring plasma samples from patients suffering from acute lymphoblastic leukemia. Plasma methotrexate concentrations ranged between 66.0 and 954 nmol/l and observed 7-hydroxymethotrexate/methotrexate ratios ranged between 0.1 and 32.4, respectively. CONCLUSION The new method showed comparable analytical performances as the fluorescence polarization immunoassay, but analyte specificity and sensitivity of the newly developed method were significantly better.
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Uchiyama M, Matsumoto T, Matsumoto T, Jimi S, Takamatsu Y, Tamura K, Hara S. Simple and sensitive HPLC method for the fluorometric determination of methotrexate and its major metabolites in human plasma by post-column photochemical reaction. Biomed Chromatogr 2011; 26:76-80. [DOI: 10.1002/bmc.1628] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2010] [Revised: 02/08/2011] [Accepted: 02/13/2011] [Indexed: 11/05/2022]
Affiliation(s)
| | | | - Taichi Matsumoto
- Faculty of Pharmaceutical Sciences; Fukuoka University; Fukuoka; Japan
| | - Shiro Jimi
- Central Laboratory of Pathology and Morphology; Fukuoka University; Fukuoka; Japan
| | - Yasushi Takamatsu
- First Department of Internal Medicine; Fukuoka University Hospital; Fukuoka; Japan
| | - Kazuo Tamura
- First Department of Internal Medicine; Fukuoka University Hospital; Fukuoka; Japan
| | - Shuuji Hara
- Faculty of Pharmaceutical Sciences; Fukuoka University; Fukuoka; Japan
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Liu X, Liu J, Huang Y, Zhao R, Liu G, Chen Y. Determination of methotrexate in human serum by high-performance liquid chromatography combined with pseudo template molecularly imprinted polymer. J Chromatogr A 2009; 1216:7533-8. [DOI: 10.1016/j.chroma.2009.06.018] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2009] [Revised: 05/31/2009] [Accepted: 06/03/2009] [Indexed: 10/20/2022]
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12
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INOUE S, HASHIGUCHI M, KAWAI S, MOCHIZUKI M. Erythrocyte Methotrexate-polyglutamate Assay Using Fluorescence Polarization Immunoassay Technique: Application to the Monitoring of Patients with Rheumatoid Arthritis. YAKUGAKU ZASSHI 2009; 129:1001-5. [DOI: 10.1248/yakushi.129.1001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Sachie INOUE
- Division for Evaluation and Analysis of Drug Information, Keio University Faculty of Pharmacy
| | - Masayuki HASHIGUCHI
- Division for Evaluation and Analysis of Drug Information, Keio University Faculty of Pharmacy
| | - Shinichi KAWAI
- Division of Rheumatology, Department of Internal Medicine (Omori), Toho University School of Medicine
| | - Mayumi MOCHIZUKI
- Division for Evaluation and Analysis of Drug Information, Keio University Faculty of Pharmacy
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Guo P, Wang X, Liu L, Belinsky MG, Kruh GD, Gallo JM. Determination of methotrexate and its major metabolite 7-hydroxymethotrexate in mouse plasma and brain tissue by liquid chromatography-tandem mass spectrometry. J Pharm Biomed Anal 2007; 43:1789-95. [PMID: 17289326 PMCID: PMC2790826 DOI: 10.1016/j.jpba.2006.12.034] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2006] [Revised: 12/21/2006] [Accepted: 12/28/2006] [Indexed: 10/23/2022]
Abstract
Methotrexate (MTX) is an anticancer agent that is widely used in a variety of human cancers including primary central nervous system lymphoma (PCNSL). Important pharmacological properties that directly bear on the use of MTX in PCNSL, such as mechanisms that govern its uptake into brain tumors, are poorly defined, but are amenable to investigation in mouse models. In order to pursue such preclinical pharmacological studies, a rapid and sensitive liquid chromatography-tandem mass spectrometry (LC/MS/MS) method for the determination of MTX and its metabolite, 7-hydroxymethotrexate (7-OH MTX) in plasma and microdialysate samples from brain tumors and cerebrospinal fluid (CSF) is needed. The plasma assay was based on 10 microl samples and following a protein precipitation procedure enabled direct injection onto a LC/MS/MS system using positive electrospray ionization. A column switching technique was employed for desalting and the clean-up of microdialysate samples from brain tissues. The methods were validated for MTX and 7-OH MTX in both plasma and microdialysate samples from brain tumor and CSF, and produced lower limits of quantification (LLOQ) in plasma of 3.7 ng/ml for MTX and 7.4 ng/ml for 7-OH MTX, and in microdialysate samples of 0.7 ng/ml for both MTX and 7-OH MTX. The utility of the method was demonstrated by estimation of pharmacokinetic (PK) and brain distribution properties of MTX and 7-OH MTX in conscious mice. The method has the advantages of low sample volume, rapid clean-up, and the simultaneous measurement of MTX and 7-OH MTX in plasma and brain tissues allowing detailed PK studies to be completed in individual mice.
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Affiliation(s)
- Ping Guo
- School of Pharmacy, Temple University, Philadelphia, PA 19140, USA
| | - Xiaomin Wang
- School of Pharmacy, Temple University, Philadelphia, PA 19140, USA
| | - Liansheng Liu
- School of Pharmacy, Temple University, Philadelphia, PA 19140, USA
| | - Martin G. Belinsky
- Medical Science Division, Fox Chase Cancer Center, Philadelphia, PA 19111, USA
| | - Gary D. Kruh
- Medical Science Division, Fox Chase Cancer Center, Philadelphia, PA 19111, USA
| | - James M. Gallo
- School of Pharmacy, Temple University, Philadelphia, PA 19140, USA
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Emara S. Determination of methotrexate in pharmaceutical formulations by flow injection analysis exploiting the reaction with potassium permanganate. ACTA ACUST UNITED AC 2004; 59:827-33. [PMID: 15474060 DOI: 10.1016/j.farmac.2004.06.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2004] [Accepted: 06/22/2004] [Indexed: 11/23/2022]
Abstract
A highly sensitive, precise and accurate flow injection procedure for the determination of methotrexate (MTX) was described. The method was based on oxidation of MTX into highly fluorescence product (2,4-diaminopteridine-6-carboxylic acid) by acidic potassium permanganate. A three-line manifold was used with potassium permanganate as an oxidant (3 mmol l(-1)) and sulfuric acid (6 mmol l(-1)) as carrier streams. The oxidation process was conducted at 65 degrees C through a reaction coil of 3 m (0.5 mm, i.d.). It was essential to eliminate the excess of potassium permanganate before passing to the detector using 8 mmol l(-1) sodium sulfite as a decolorizing stream. The fluorescence intensity was measured at excitation and emission wavelengths of 369 and 465 nm, respectively. The calibration graph was linear over the range 40-400 ng ml(-1) MTX. The developed method was successfully applied to the determination of MTX in pharmaceutical formulations, at a sampling rate of 90 sample h(-1) and showed a % recovery ranging from 99.96 to 100.07 and SD% ranging from 0.51 to 0.65%.
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Affiliation(s)
- Samy Emara
- Department of Analytical Pharmaceutical Chemistry, Faculty of Pharmacy, Suez Canal University, Ismialia 41522, Egypt.
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Sabry SM, Abdel-Hady M, Elsayed M, Fahmy OT, Maher HM. Study of stability of methotrexate in acidic solution Spectrofluorimetric determination of methotrexate in pharmaceutical preparations through acid-catalyzed degradation reaction. J Pharm Biomed Anal 2003; 32:409-23. [PMID: 14565545 DOI: 10.1016/s0731-7085(03)00239-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Study of the degradation reaction of methotrexate (MTX) in acidic solution was carried out. Optimization of the experimental parameters of MTX acid hydrolysis was investigated. Spectrofluorimetric method for determination of MTX through measurement of its acid-degradation product, 4-amino-4-deoxy-10-methylpteroic acid (AMP), was developed. Stability of the standard solution of MTX prepared in sulfuric acid was discussed in the view of accelerated stability analysis. Two other comparative spectroflourimetric methods based on measuring the fluorescence intensities from either a condensation reaction with acetylacetone-formaldehyde (Hantzsch reaction) or a reaction with fluorescamine were also described. Beer's law validation, accuracy, precision, limits of detection, limits of quantification, and other aspects of analytical merit are presented in the text. The proposed methods were successfully applied for the analysis of MTX in pure drug and tablets dosage form. The sensitivity of the developed methods was favorable, so it was possible to be adopted for determination of MTX in plasma samples for routine use in high-dose MTX therapy.
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Affiliation(s)
- Suzy M Sabry
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, University of Alexandria, Alexandria, Egypt.
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Sadray S, Rezaee S, Rezakhah S. Non-linear heteroscedastic regression model for determination of methotrexate in human plasma by high-performance liquid chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2003; 787:293-302. [PMID: 12650752 DOI: 10.1016/s1570-0232(02)00952-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Generalized least squares regression with variance function estimation was used to derive the calibration function for measurement of methotrexate plasma concentration and its results were compared with weighted least squares regression by usual weight factors and also with that of ordinary least squares method. In the calibration curve range of 0.05 to 100 microM, both heteroscedasticity and non-linearity were present therefore ordinary least squares linear regression methods could result in large errors in the calculation of methotrexate concentration. Generalized least squares regression with variance function estimation worked better than both the weighted regression with the usual weight factors and ordinary least squares regression and gave better estimates for methotrexate concentration.
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Affiliation(s)
- Sima Sadray
- Laboratory of Pharmacokinetics and Biopharmaceutics, Department of Pharmaceutics, Faculty of Pharmacy, Tehran University of Medical Sciences, P.O. Box 14155/6451, Tehran, Iran.
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Kuo C, Wu H, Wu S. Enantiomeric analysis of methotrexate in pharmaceuticals by cyclodextrin-modified capillary electrophoresis. Anal Chim Acta 2002. [DOI: 10.1016/s0003-2670(02)00935-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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18
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Novel approach for the purification and analysis of methotrexate-branched polymeric polypeptide conjugates by HPLC. Chromatographia 2002. [DOI: 10.1007/bf02492137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Rubino FM. Separation methods for methotrexate, its structural analogues and metabolites. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2001; 764:217-54. [PMID: 11817030 DOI: 10.1016/s0378-4347(01)00402-9] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Methotrexate (MTX) is the prototype folate antagonist cytotoxic drug, employed in the therapy of solid tumors and leukaemias, and recently also as an immunosuppressive agent in organ transplantation, in the treatment of some autoimmune diseases and in the therapy of severe asthma. MTX is one of the very few antineoplastic drugs the therapeutic concentration monitoring of which is currently employed in clinical practice and can be routinely measured in biological samples by a number of different analytical techniques, among which are immunoenzymatic and chromatographic methods. Each technique has of course its own advantages in terms of sensitivity, specificity, speed, cost and level of expertise required. Along with therapeutic drug concentration monitoring and clinical pharmacology, fundamental research into the mechanism of action of antifolate drugs is still a field which requires the measurement of MTX, of its new analogues and of their metabolites in biological samples. This review summarizes the instrumental conditions and the performance of several published chromatographic methods employed to measure MTX, its metabolites and some analogues in clinical and biological research. More than 70 papers describing chromatographic assays for MTX and its metabolites have been published in the literature between 1975 and 2000. A wide array of experimental conditions for sample preparation, analyte separation and detection have been employed. According to their chemical properties, MTX, its metabolites and analogue drugs present in several biological samples (plasma, serum, saliva, urine, cerebrospinal fluid, tissue specimens) can be extracted, separated and detected under a variety of chromatographic conditions, i.e. on different stationary phases, under a wide choice of mobile phase conditions (acidic or neutral, employing ion-pair or micellar chromatography), followed by several detection techniques (UV-Vis spectrophotometry, pre- or post-column oxidation and fluorimetry, electrochemistry, mass spectrometry). Optimized methods allow simultaneous measurement within a few minutes of the plasma levels of MTX and its main metabolites at concentrations in the low-nM range. One special field which needs sensitive, fast and inexpensive methods for the detection and measurement of MTX is the monitoring of contamination in workplace environments, such as pharmaceutical industries and oncological hospital pharmacies, and in sewage waters. The measurement of the intracellular gamma-oligo-glutamate metabolites of biological folates, of MTX and of some analogue drugs is of great importance in basic pharmacological research. The existence of empirical quantitative relationships between the retention of individual oligomers under different chromatographic conditions and the number of added glutamic acid units allows identification of the metabolites even when authentic standards are not available.
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Affiliation(s)
- F M Rubino
- Department of Medicine, Surgery and Odontology, University of Milano at Ospedale S. Paolo, Milan, Italy.
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Lobo ED, Balthasar JP. Highly sensitive high-performance liquid chromatographic assay for methotrexate in the presence and absence of anti-methotrexate antibody fragments in rat and mouse plasma. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1999; 736:191-9. [PMID: 10676999 DOI: 10.1016/s0378-4347(99)00460-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Recently, Balthasar and Fung have proposed that anti-methotrexate antibody fragments may be employed to enhance the selectivity of intraperitoneal methotrexate (MTX) therapy. This current work presents a sensitive high-performance liquid chromatographic method for measuring plasma concentrations of total (i.e., bound and unbound) MTX and free (unbound) MTX in rat and mouse plasma, in the presence or absence of therapeutic anti-MTX antibody fragments. The assay involves pre-column derivatization of MTX by sodium hydrosulfite to 2,4-diamino-6-methylpteridine. The limit of quantitation for MTX by this assay was 1.25 ng in rat plasma, mouse plasma and mouse plasma ultrafiltrate, which corresponds to a concentration of 25 ng/ml for a 50 microl sample. The limit of quantitation was found to be 2.5 ng in rat plasma ultrafiltrate (i.e., 50 ng/ml in 50 microl rat plasma ultrafiltrate). The method was shown to be quite accurate, as the mean assayed concentration of quality control samples was within 10% of theoretical values. We have applied the method to the investigation of MTX pharmacokinetics in mice and rats, following the administration of MTX alone or following simultaneous administration of MTX and anti-MTX Fab fragments. The method has been shown to be suitable for the assay of total and free methotrexate in the plasma of these species and will enable the testing of pharmacokinetic hypotheses regarding the influence of anti-MTX Fab fragments on the disposition of MTX.
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Affiliation(s)
- E D Lobo
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City 84108, USA
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Sparreboom A, Loos WJ, Nooter K, Stoter G, Verweij J. Liquid chromatographic analysis and preliminary pharmacokinetics of methotrexate in cancer patients co-treated with docetaxel. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1999; 735:111-9. [PMID: 10630896 DOI: 10.1016/s0378-4347(99)00387-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A new HPLC method has been developed for the quantitative determination of methotrexate (MTX) and its 7-hydroxyl metabolite in human plasma. Samples were purified by protein precipitation with acetone and methanol, and a sample clean-up with a mixture of n-butanol and diethyl ether. The analytes were separated on an RP Inertsil ODS-80A column and eluted in a solvent system containing 5% (v/v) tetrahydrofuran in water (pH 2.0). UV absorption measurement was performed at 313 nm, and the detector response was linear in a concentration range of 10-10,000 ng/ml. The lower limit of quantitation of MTX was 10 ng/ml using 1 ml sample aliquots. Values for accuracy and (within-run and between-run) precision were between 95.5-111% and 3.69-11.0%, respectively, at four concentrations analyzed in quintuplicate on four separate occasions. The assay was applied to study the effects of docetaxel co-administration on the pharmacokinetics and metabolism of MTX in cancer patients.
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Affiliation(s)
- A Sparreboom
- Department of Medical Oncology, Rotterdam Cancer Institute (Daniel den Hoed Kliniek) and University Hospital Rotterdam, The Netherlands.
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