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Seyfinejad B, Jouyban A. Capillary electrophoresis-mass spectrometry in pharmaceutical and biomedical analyses. J Pharm Biomed Anal 2022; 221:115059. [DOI: 10.1016/j.jpba.2022.115059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 09/05/2022] [Accepted: 09/14/2022] [Indexed: 10/31/2022]
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2
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Labuz K, Adamowicz P, Kała M, Pyrc K, Reszke E, Mielczarek P, Silberring J, Smoluch M. Detection of legal highs in the urine of methadone-treated patient by LC-MS. Basic Clin Pharmacol Toxicol 2019; 125:253-258. [PMID: 31188528 DOI: 10.1111/bcpt.13270] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 06/02/2019] [Indexed: 11/30/2022]
Abstract
Urine tests are the commonly accepted methods to control abstinence and adherence to treatment of patients who undergo methadone maintenance treatment (MMT). Depending on various national guidelines and accessibility of techniques, only selected psychoactive substances are routinely tested in urine of MMT patients. In general, they belong to the few groups of compounds: THC, cocaine, amphetamines, opiates, PCP and benzodiazepines. It is, however, well known that patients enrolled in such replacement programmes take psychoactive substances that are not routinely detected by the toxicology laboratories, to escape unexpected tests. Here, we report semiquantitative detection of legal highs taken by the MMT patient, using high-pressure liquid chromatography coupled to the flowing atmospheric pressure afterglow ion source (LC-FAPA-MS). To demonstrate effectivity of this technique, the data were confirmed by quantitative analysis using LC-ESI-MS/MS. In the analysed sample of MMT patient, a mixture of psychoactive compounds was found, namely 3-MMC (3-methylmethcathinone), pentedrone and methcathinone and determined at the concentrations of 670; 50 and 0.2 µg/mL, respectively. Such fast analytical technique may be useful for the efficient control of substances taken intentionally by MMT patients.
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Affiliation(s)
- Krzysztof Labuz
- Nordhemskliniken, Unit of Addiction, Sahlgrenska University Hospital, Göteborg, Sweden.,The Rydygier Hospital in Krakow, Addiction Outpatient Clinic, Krakow, Poland
| | | | - Maria Kała
- Cracow School of Health Promotion, Kraków, Poland
| | - Krzysztof Pyrc
- Microbiology Department, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland.,Virogenetics Laboratory of Virology, Malopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland
| | | | - Przemyslaw Mielczarek
- Department of Biochemistry and Neurobiology, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Kraków, Poland.,Laboratory of Proteomics and Mass Spectrometry, Institute of Pharmacology, Polish Academy of Sciences, Krakow, Poland
| | - Jerzy Silberring
- Department of Biochemistry and Neurobiology, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Kraków, Poland.,Centre of Polymer and Carbon Materials, Polish Academy of Sciences, Zabrze, Poland
| | - Marek Smoluch
- Department of Biochemistry and Neurobiology, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Kraków, Poland
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Couto RAS, Gonçalves LM, Carvalho F, Rodrigues JA, Rodrigues CMP, Quinaz MB. The Analytical Challenge in the Determination of Cathinones, Key-Players in the Worldwide Phenomenon of Novel Psychoactive Substances. Crit Rev Anal Chem 2018; 48:372-390. [DOI: 10.1080/10408347.2018.1439724] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Rosa A. S. Couto
- LAQV/REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, Porto, Portugal
| | - Luís Moreira Gonçalves
- LAQV/REQUIMTE, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Porto, Portugal
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo (USP), São Paulo, Brazil
| | - Félix Carvalho
- UCIBIO/REQUIMTE, Laboratory of Toxicology, Faculty of Pharmacy, University of Porto, Porto, Portugal
| | - José A. Rodrigues
- LAQV/REQUIMTE, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Porto, Portugal
| | - Cecília M. P. Rodrigues
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
| | - M. Beatriz Quinaz
- LAQV/REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, Porto, Portugal
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Hamidi S, Alipour-Ghorbani N, Hamidi A. Solid Phase Microextraction Techniques in Determination of Biomarkers. Crit Rev Anal Chem 2018; 48:239-251. [DOI: 10.1080/10408347.2017.1396885] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Samin Hamidi
- Food and Drug Safety Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Nastaran Alipour-Ghorbani
- Research Laboratory of Dendrimers and Nanopolymers, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
| | - Aliasghar Hamidi
- Food and Drug Safety Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Medicinal Chemistry, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
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Hamidi S, Alipour-Ghorbani N. Liquid-phase microextraction of biomarkers: A review on current methods. J LIQ CHROMATOGR R T 2017. [DOI: 10.1080/10826076.2017.1374291] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Samin Hamidi
- Food and Drug Safety Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Nastaran Alipour-Ghorbani
- Laboratory of Dendrimers and Nano-Biopolymers, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
- Research Center for Pharmaceutical Nanotechnology, Tabriz University of Medical Science, Tabriz, Iran
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Abstract
In clinical metabolomics, capillary electrophoresis-mass spectrometry (CE-MS) has become a very useful technique for the analysis of highly polar and charged metabolites in complex biologic samples. A comprehensive overview of recent developments in CE-MS for metabolic profiling studies is presented. This review covers theory, CE separation modes, capillary coatings, and practical aspects of CE-MS coupling. Attention is also given to sample pretreatment and data analysis strategies used for metabolomics. The applicability of CE-MS for clinical metabolomics is illustrated using samples ranging from plasma and urine to cells and tissues. CE-MS application to large-scale and quantitative clinical metabolomics is addressed. Conclusions and perspectives on this unique analytic strategy are presented.
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7
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Isbell TA, Strickland EC, Hitchcock J, McIntire G, Colyer CL. Capillary electrophoresis-mass spectrometry determination of morphine and its isobaric glucuronide metabolites. J Chromatogr B Analyt Technol Biomed Life Sci 2015; 980:65-71. [DOI: 10.1016/j.jchromb.2014.11.035] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2014] [Revised: 11/20/2014] [Accepted: 11/29/2014] [Indexed: 10/24/2022]
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8
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Lindenburg PW, Haselberg R, Rozing G, Ramautar R. Developments in Interfacing Designs for CE–MS: Towards Enabling Tools for Proteomics and Metabolomics. Chromatographia 2014. [DOI: 10.1007/s10337-014-2795-5] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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9
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Nevado JJB, Peñalvo GC, Dorado RMR, Robledo VR. Simultaneous determination of omeprazole and their main metabolites in human urine samples by capillary electrophoresis using electrospray ionization-mass spectrometry detection. J Pharm Biomed Anal 2014; 92:211-9. [PMID: 24530982 DOI: 10.1016/j.jpba.2013.12.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 12/13/2013] [Accepted: 12/18/2013] [Indexed: 11/17/2022]
Abstract
We report a novel method for the simultaneous determination of omeprazole and their main metabolites (omeprazole sulphide, omeprazole sulphone and 5-hydroxy omeprazole) in human urine samples. For this purpose, two new capillary electrophoresis (CE) methods were developed for the simultaneous determination of target compounds, using initially diode-array for optical detection and electrospray ionization-mass spectrometry (ESI-MS) for metabolites identification and identity confirmation. A new metabolite (5-hydroxysulphide omeprazole) was identified by electrospray ionization multi-stage mass spectrometry (ESI-MS2) fragment which was then used to support the proposed chemical structure. Pharmacokinetic results using CE method were compared with those obtained when a HPLC method was used. Equivalent pharmacokinetics profiles resulted when any analytical methods were carried out.
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Affiliation(s)
- Juan José Berzas Nevado
- Department of Analytical Chemistry and Food Technology, Faculty of Chemistry, University of Castilla-La Mancha, Ciudad Real, Spain
| | - Gregorio Castañeda Peñalvo
- Department of Analytical Chemistry and Food Technology, Faculty of Chemistry, University of Castilla-La Mancha, Ciudad Real, Spain
| | - Rosa María Rodríguez Dorado
- Department of Analytical Chemistry and Food Technology, Faculty of Chemistry, University of Castilla-La Mancha, Ciudad Real, Spain
| | - Virginia Rodríguez Robledo
- Department of Analytical Chemistry and Food Technology, Faculty of Pharmacy University of Castilla-La Mancha, Albacete, Spain.
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Ramautar R, Somsen GW, de Jong GJ. Developments in coupled solid-phase extraction-capillary electrophoresis 2011-2013. Electrophoresis 2013; 35:128-37. [DOI: 10.1002/elps.201300335] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Revised: 09/16/2013] [Accepted: 09/16/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Rawi Ramautar
- Leiden Academic Center for Drug Research; Leiden University; Leiden the Netherlands
| | - Govert W. Somsen
- AIMMS Division of BioAnalytical Chemistry; VU University; Amsterdam the Netherlands
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Bonvin G, Schappler J, Rudaz S. Capillary electrophoresis–electrospray ionization-mass spectrometry interfaces: Fundamental concepts and technical developments. J Chromatogr A 2012; 1267:17-31. [DOI: 10.1016/j.chroma.2012.07.019] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Revised: 07/04/2012] [Accepted: 07/06/2012] [Indexed: 01/24/2023]
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12
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Jost MM. Surrogate end points: how well do they represent patient-relevant end points? Biomark Med 2012; 1:437-51. [PMID: 20477385 DOI: 10.2217/17520363.1.3.437] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This review takes a critical look at the concept of replacing patient-relevant end points, such as morbidity or mortality, with surrogate end points in clinical trials. Surrogate end points can be measured earlier in the course of a clinical trial and so are thought to accelerate the drug development process. Furthermore, they might be beneficial to the patients themselves by allowing faster adjustment of therapeutic strategies. However, the fact that in the past several promising surrogate end points have not fulfilled their expectations emphasizes the importance of applying strict evaluation criteria. The evaluation of the candidate surrogate end point prostate-specific antigen using the Prentice criteria and a meta-analytic approach is discussed. Prostate-specific antigen is often used to replace overall or progression-free survival in prostate cancer trials testing the benefit of medical interventions.
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Affiliation(s)
- Marco M Jost
- Institute for Quality & Efficiency in Health Care, Dillenburger Str. 27, D-51105 Cologne, Germany.
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13
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Gottardo R, Mikšík I, Aturki Z, Sorio D, Seri C, Fanali S, Tagliaro F. Analysis of drugs of forensic interest with capillary zone electrophoresis/time-of-flight mass spectrometry based on the use of non-volatile buffers. Electrophoresis 2012; 33:599-606. [PMID: 22451052 DOI: 10.1002/elps.201100383] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The present work is aimed at investigating the influence of the background electrolyte composition and concentration on the separation efficiency and resolution and mass spectrometric detection of illicit drugs in a capillary zone electrophoresis-electrospray ionization-time of flight mass spectrometry (CZE-ESI-TOF MS) system. The effect of phosphate, borate and Tris buffers on the separation and mass spectrometry response of a mixture of 3,4-methylenedioxyamphetamine, 3,4-methylenedioxymethamphetamine, methadone, cocaine, morphine, codeine and 6-monoacetylmorphine was studied, in comparison with a reference ammonium formate separation buffer. Inorganic non-volatile borate and Tris buffers proved hardly suitable for capillary electrophoresis-mass spectrometry (CE-MS) analysis, but quite unexpectedly ammonium phosphate buffers showed good separation and ionization performances for all the analytes tested. Applications of this method to real samples of hair from drug addicts are also provided.
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Affiliation(s)
- Rossella Gottardo
- Department of Public Health and Community Medicine, Unit of Forensic Medicine, University of Verona, Verona, Italy
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14
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Monitoring compliance to therapy during addiction treatments by means of hair analysis for drugs and drug metabolites using capillary zone electrophoresis coupled to time-of-flight mass spectrometry. Forensic Sci Int 2012; 216:101-7. [DOI: 10.1016/j.forsciint.2011.09.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Revised: 08/17/2011] [Accepted: 09/01/2011] [Indexed: 11/22/2022]
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15
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Ramautar R, de Jong GJ, Somsen GW. Developments in coupled solid-phase extraction-capillary electrophoresis 2009-2011. Electrophoresis 2011; 33:243-50. [DOI: 10.1002/elps.201100453] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Revised: 09/15/2011] [Accepted: 09/16/2011] [Indexed: 02/06/2023]
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16
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Hommerson P, Khan AM, de Jong GJ, Somsen GW. Ionization techniques in capillary electrophoresis-mass spectrometry: principles, design, and application. MASS SPECTROMETRY REVIEWS 2011; 30:1096-1120. [PMID: 21462232 DOI: 10.1002/mas.20313] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2009] [Accepted: 06/03/2010] [Indexed: 05/30/2023]
Abstract
A major step forward in the development and application of capillary electrophoresis (CE) was its coupling to ESI-MS, first reported in 1987. More than two decades later, ESI has remained the principal ionization technique in CE-MS, but a number of other ionization techniques have also been implemented. In this review the state-of-the-art in the employment of soft ionization techniques for CE-MS is presented. First the fundamentals and general challenges of hyphenating conventional CE and microchip electrophoresis with MS are outlined. After elaborating on the characteristics and role of ESI, emphasis is put on alternative ionization techniques including sonic spray ionization (SSI), thermospray ionization (TSI), atmospheric pressure chemical ionization (APCI), atmospheric pressure photoionization (APPI), matrix-assisted laser desorption ionization (MALDI) and continuous-flow fast atom bombardment (CF-FAB). The principle of each ionization technique is outlined and the experimental set-ups of the CE-MS couplings are described. The strengths and limitations of each ionization technique with respect to CE-MS are discussed and the applicability of the various systems is illustrated by a number of typical examples.
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MESH Headings
- Electrophoresis, Capillary/instrumentation
- Electrophoresis, Capillary/methods
- Equipment Design/instrumentation
- Equipment Design/methods
- Pharmaceutical Preparations/analysis
- Pharmaceutical Preparations/chemistry
- Proteins/analysis
- Proteins/chemistry
- Spectrometry, Mass, Electrospray Ionization/instrumentation
- Spectrometry, Mass, Electrospray Ionization/methods
- Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization/instrumentation
- Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization/methods
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Affiliation(s)
- Paul Hommerson
- Department of Biomedical Analysis, Utrecht University, PO Box 80082, 3508 TB Utrecht, The Netherlands.
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Bachmann S, Bakry R, Huck CW, Polato F, Corradini D, Bonn GK. Peptide mapping using capillary electrophoresis offline coupled to matrix-assisted laser desorption ionization time of flight mass spectrometry. Electrophoresis 2011; 32:2830-9. [PMID: 21953317 DOI: 10.1002/elps.201000653] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Revised: 03/14/2011] [Accepted: 03/14/2011] [Indexed: 01/20/2023]
Abstract
This article reports the results of a study carried out to evaluate the offline hyphenation of capillary zone electrophoresis with matrix-assisted lased desorption ionization time of flight mass spectrometry (MALDI-TOF-MS) for the analysis of low-abundant complex samples, represented by the tryptic phosphorylated peptides of phosphoproteins, such as α-casein, β-casein, and fetuin. The proposed method employs a latex-coated capillary and consists in the online preconcentration of the tryptic peptides by a pH-mediated stacking method, their separation by capillary zone electrophoresis, and subsequent deposition of the separated analytes onto a MALDI target for their MS analysis. The online preconcentration method allows loading a large sample volume (∼150 nL), which is introduced into the capillary after the hydrodynamic injection of a short plug of 1.0 M ammonium hydroxide solution and is sandwiched between two plugs of the acidic background electrolyte solution (BGE) filling the capillary. The sample spotting of the separated analytes onto the MALDI target is performed either during or postseparation using an automatic spotting device connected to the exit of the separation capillary. The proposed method allows the separation and identification of multiphosphorylated peptides from other peptides and enables their identification at femtomole level with improved efficiency compared with LC approaches hyphenated to MS.
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Affiliation(s)
- Stefan Bachmann
- Institute of Analytical Chemistry and Radiochemistry, Leopold-Franzens University, Innsbruck, Austria
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Marák J, Staňová A, Gajdoštínová S, Škultéty L, Kaniansky D. Some possibilities of an analysis of complex samples by a mass spectrometry with a sample pretreatment by an offline coupled preparative capillary isotachophoresis. Electrophoresis 2011; 32:1273-81. [DOI: 10.1002/elps.201000629] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2010] [Revised: 01/10/2011] [Accepted: 01/20/2011] [Indexed: 01/30/2023]
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Abstract
Although in recent decades the development of many drugs against cancer has been witnessed, the morbidity and mortality for the most prevalent urogenital cancer have not been significantly reduced. A key task in cancer medicine is to detect the disease as early as possible. In order to achieve this, many new technologies have been developed for cancer biomarker discovery. Monitoring fluctuations of certain metabolite levels in body fluids, such as urine, has become an important way to detect early stages in carcinogenesis. Moreover metabolomic approaches are likely to be used to screen for potential diagnostic and prognostic biomarkers of urogenital cancer. In future work, these potential biomarkers should be further validated with a large enough patient cohort to achieve earlier diagnosis not only of urogenital cancer, but also other malignancies. Moreover, the improvement of patient prognosis will be another aim of such investigations. This novel metabolomic approach has the potential to provide more information about the pathophysiological status of an organism and distinguish precancerous and cancerous stages.
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Cheng J, Zhang L, Lu Q, Lu M, Chen Z, Chen G. pCEC coupling with ESI-MS for the analysis of β2-agonists and narcotics using a poly-(1-hexadecene-co-TMPTMA) monolithic column. Electrophoresis 2010; 31:1991-7. [DOI: 10.1002/elps.201000088] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Bachmann S, Vallant R, Bakry R, Huck CW, Corradini D, Bonn GK. CE coupled to MALDI with novel covalently coated capillaries. Electrophoresis 2010; 31:618-29. [DOI: 10.1002/elps.200900507] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Rapid and direct determination of creatinine in urine using capillary zone electrophoresis. Clin Chim Acta 2009; 409:52-5. [DOI: 10.1016/j.cca.2009.08.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Revised: 08/14/2009] [Accepted: 08/23/2009] [Indexed: 10/20/2022]
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Rodríguez Robledo V, Smyth WF. The application of CE-MS in the trace analysis of environmental pollutants and food contaminants. Electrophoresis 2009; 30:1647-60. [PMID: 19378285 DOI: 10.1002/elps.200800651] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
In this review, selected applications of CE-MS in recent years have been highlighted for the separation, detection and determination of environmental pollutants and food contaminants in selected samples. Trace analysis by CE-MS of analytes such as low molecular mass amines, nitroaromatics, alkylphosphonic acids, azo dyes, antidepressants, and antibiotic drugs, among others, in air, sediment and water samples have been reviewed. The CE-MS analysis of pesticides such as triazolopyrimidine sulphoanilides, different types of antibiotics (sulphonamides, beta-lactones, quinolones and tetracyclines) and other exogenous compounds such as acrylamide and toxic oligopeptides in food samples has also been reviewed. The review gives details on the fragmentations, where available, that the ionic species exhibit in-source and in ion trap, triple quadrupole and ToF MS analysers. A critical evaluation is also given of these recent CE-MS analytical methods for the separation, detection and determination of trace levels of such pollutants and contaminants with analytical information on the treatment of the samples, CE separation conditions, linearity ranges, LODs and recoveries from the different matrices presented.
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Affiliation(s)
- Virginia Rodríguez Robledo
- Departamento de Química Analítica y Tecnología de los Alimentos, Facultad de Ciencias Químicas, University of Castilla-La Mancha, Cuidad Real, Spain
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Martin GB, Mansion F, Servais AC, Debrus B, Rozet E, Hubert P, Crommen J, Fillet M. CE-MS method development for peptides analysis, especially hepcidin, an iron metabolism marker. Electrophoresis 2009; 30:2624-31. [DOI: 10.1002/elps.200800794] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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26
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Chankvetadze B. Separation of enantiomers with charged chiral selectors in CE. Electrophoresis 2009; 30 Suppl 1:S211-21. [DOI: 10.1002/elps.200900102] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Klampfl CW. CE with MS detection: A rapidly developing hyphenated technique. Electrophoresis 2009; 30 Suppl 1:S83-91. [DOI: 10.1002/elps.200900088] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Staub A, Schappler J, Rudaz S, Veuthey JL. CE-TOF/MS: Fundamental concepts, instrumental considerations and applications. Electrophoresis 2009; 30:1610-23. [DOI: 10.1002/elps.200800782] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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29
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Shi LH, Jin YX, Moon DC, Kim SK, Park SR. A sheathless CE/ESI-MS interface with an ionophore membrane-packed electro-conduction channel. Electrophoresis 2009; 30:1661-9. [DOI: 10.1002/elps.200800664] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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30
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Bianco G, Abate S, Labella C, Cataldi TRI. Identification and fragmentation pathways of caffeine metabolites in urine samples via liquid chromatography with positive electrospray ionization coupled to a hybrid quadrupole linear ion trap (LTQ) and Fourier transform ion cyclotron resonance mass spectrometry and tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2009; 23:1065-1074. [PMID: 19260028 DOI: 10.1002/rcm.3969] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Liquid chromatography (LC) with positive ion electrospray ionization (ESI+) coupled to a hybrid quadrupole linear ion trap (LTQ) and Fourier transform ion cyclotron resonance mass spectrometry (FTICRMS) was employed for the simultaneous determination of caffeine and its metabolites in human urine within a single chromatographic run. LC/ESI-FTICRMS led to the unambiguous determination of the molecular masses of the studied compounds without interference from other biomolecules. A systematic and comprehensive study of the mass spectral behaviour of caffeine and its fourteen metabolites by tandem mass spectrometry (MS/MS) was performed, through in-source ion trap collision-induced dissociation (CID) of the protonated molecules, [M+H](+). A retro-Diels-Alder (RDA) process along with ring-contraction reactions were the major fragmentation pathways observed during CID. The base peak of xanthine precursors originates from the loss of methyl isocyanate (CH(3)NCO, 57 Da) or isocyanic acid (HNCO, 43 Da), which in turn lose a CO unit. Also uric acid derivatives shared a RDA rearrangement as a common fragmentation process and a successive loss of CO(2) or CO. The uracil derivatives showed a loss of a ketene unit (CH(2)CO, 42 Da) from the protonated molecule along with the loss of H(2)O or CO. To assess the potential of the present method three established metabolite ratios to measure P450 CYP1A2, N-acetyltransferase and xanthine oxidase activities were evaluated by a number of identified metabolites from healthy human urine samples after caffeine intake.
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Affiliation(s)
- Giuliana Bianco
- Dipartimento di Chimica, Università degli Studi della Basilicata, Via N. Sauro 85, 85100 Potenza, Italy
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Pantůčková P, Gebauer P, Boček P, Křivánková L. Electrolyte systems for on-line CE-MS: Detection requirements and separation possibilities. Electrophoresis 2009; 30:203-14. [DOI: 10.1002/elps.200800262] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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33
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Chalcraft KR, Britz-McKibbin P. Newborn Screening of Inborn Errors of Metabolism by Capillary Electrophoresis−Electrospray Ionization-Mass Spectrometry: A Second-Tier Method with Improved Specificity and Sensitivity. Anal Chem 2008; 81:307-14. [PMID: 19117458 DOI: 10.1021/ac8020455] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kenneth R. Chalcraft
- Department of Chemistry, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Philip Britz-McKibbin
- Department of Chemistry, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
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34
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Gottardo R, Polettini A, Sorio D, Pascali JP, Bortolotti F, Liotta E, Tagliaro F. Capillary zone electrophoresis (CZE) coupled to time-of-flight mass spectrometry (TOF-MS) applied to the analysis of illicit and controlled drugs in blood. Electrophoresis 2008; 29:4078-87. [DOI: 10.1002/elps.200800087] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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35
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Interferences and contaminants encountered in modern mass spectrometry. Anal Chim Acta 2008; 627:71-81. [PMID: 18790129 DOI: 10.1016/j.aca.2008.04.043] [Citation(s) in RCA: 419] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2008] [Revised: 04/14/2008] [Accepted: 04/16/2008] [Indexed: 12/26/2022]
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36
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Schappler J, Guillarme D, Prat J, Veuthey JL, Rudaz S. Validation of chiral capillary electrophoresis-electrospray ionization-mass spectrometry methods for ecstasy and methadone in plasma. Electrophoresis 2008; 29:2193-202. [DOI: 10.1002/elps.200700464] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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37
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Capillary electrophoresis analysis of biofluids with a focus on less commonly analyzed matrices. J Chromatogr B Analyt Technol Biomed Life Sci 2008; 866:154-66. [DOI: 10.1016/j.jchromb.2008.01.058] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2007] [Revised: 01/23/2008] [Accepted: 01/24/2008] [Indexed: 12/19/2022]
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38
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Atha DH. High-throughput DNA diagnostic measurements using capillary electrophoresis: p53, fragile X and telomerase. EXPERT OPINION ON MEDICAL DIAGNOSTICS 2008; 2:91-100. [PMID: 23485119 DOI: 10.1517/17530059.2.1.91] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Capillary electrophoresis (CE) has become recognized as a powerful tool for the characterization of DNA. It has numerous advantages over slab-gel electrophoresis in that it is fast, highly reproducible and easy to automate. It is well known for its contribution to success in sequencing the human genome, but it is equally important in a wide range of forensic and pharmaceutical applications. Of these applications, CE plays a large and important role in mutation scanning and DNA sizing. From the author's laboratory, three previously published examples are given of clinical applications in this area that have benefited from the use of capillary electrophoresis: the detection of p53 mutations by single strand conformational polymorphism, the analysis of fragile X syndrome and the measurement of telomerase activity. There are many examples from other laboratories where CE has played an important role in this field. For acceptance by the medical community, there must be a clear demonstration that capillary electrophoresis can replace and improve previous slab-gel methods. In this regard, the examples given in this review help to demonstrate that CE can replace previous slab-gel methods and show that CE can improve a wide range of applications in the medical field.
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Affiliation(s)
- Donald H Atha
- National Institute of Standards and Technology, Biochemical Science Division, 100 Bureau Drive, MS 8311, Gaithersburg, MD 20899, USA +1 301 975 3092 ; +1 301 975 8505 ;
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39
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Tagliaro F, Bortolotti F. Recent advances in the applications of CE to forensic sciences (2005–2007). Electrophoresis 2008; 29:260-8. [DOI: 10.1002/elps.200700708] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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40
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Gaspar A, Englmann M, Fekete A, Harir M, Schmitt-Kopplin P. Trends in CE-MS 2005–2006. Electrophoresis 2008; 29:66-79. [DOI: 10.1002/elps.200700721] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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41
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18 Coupling CE and microchip-based devices with mass spectrometry. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/s0149-6395(07)00018-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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42
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Song EJ, Babar SME, Oh E, Hasan MN, Hong HM, Yoo YS. CE at the omics level: Towards systems biology – An update. Electrophoresis 2008; 29:129-42. [DOI: 10.1002/elps.200700467] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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43
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Zeng ZD, Liang YZ, Chau FT, Chen S, Daniel MKW, Chan CO. Mass spectral profiling: an effective tool for quality control of herbal medicines. Anal Chim Acta 2007; 604:89-98. [PMID: 17996528 PMCID: PMC7119444 DOI: 10.1016/j.aca.2007.09.057] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2007] [Revised: 09/23/2007] [Accepted: 09/26/2007] [Indexed: 11/21/2022]
Abstract
Quality control of herbal medicines (HMs) is a big big headache because of the high complexity and unknown mechanism on disease treatment. In this work, mass spectral profiling, a new tool for data processing is proposed to help a lot in solving this problem as gas chromatography-mass spectroscopy (GC-MS) is used to detect both the active and non-active ingredients buried in HMs. The main idea of mass spectral profiling is employment of target m/z points of GC-MS data on the extraction of chromatographic profiles of pure and/or mixed compositions concerned. Further, the absolute or relative abundance at these m/z points can be utilized for results interpretation. With the help of this tool, the qualitative and quantitative information of chemical components within complicated HMs will be mined out effectively. It can then be recommended as reference indices to assess the importance of target compositions in HMs, such as efficacy evaluation on disease treatment of the active constituents. Mass spectral profiling with less data points significantly improves the possibility to get the rich information with no strong requirements of data preprocessing procedures, like alignment of shift of retention times among different chromatographic profiles. It is powerful for quality control of HMs coupled with pattern recognition techniques on high-throughput data sets. In this study, a commonly used herbal medicine, Houttuynia cordata Thunb and its finished injection products, were used to deliver the strategies. Absolutely, the working principles can be extended to the investigation of metabonomics with gas chromatography-time-of-flight-mass spectrometry (GC-MS-TOF). The good performance of mass spectral profiling shows that it can be a promising tool in the future studies of complex mixture systems.
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Affiliation(s)
- Zhong-Da Zeng
- Chemometrics and Herbal Medicine Laboratory, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China
- Research Center of Modernization of Chinese Medicines, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China
| | - Yi-Zeng Liang
- Research Center of Modernization of Chinese Medicines, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China
| | - Foo-Tim Chau
- Chemometrics and Herbal Medicine Laboratory, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China
- State Key Laboratory of Chinese Medicine and Molecular Pharmacology, Shenzhen 518057, PR China
| | - Shuo Chen
- Research Center of Modernization of Chinese Medicines, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China
| | - Mok Kam-Wah Daniel
- Chemometrics and Herbal Medicine Laboratory, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China
| | - Chi-On Chan
- Chemometrics and Herbal Medicine Laboratory, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China
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44
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Schappler J, Guillarme D, Prat J, Veuthey JL, Rudaz S. Coupling CE with atmospheric pressure photoionization MS for pharmaceutical basic compounds: Optimization of operating parameters. Electrophoresis 2007; 28:3078-87. [PMID: 17724698 DOI: 10.1002/elps.200700012] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The use of CE coupled with MS (CE-MS) has evolved as a useful tool to analyze charged species in small sample volumes. Because of its sensitivity, versatility and ease of implementation, the ESI interface is currently the method of choice to hyphenate CE to MS. An alternative can be the atmospheric pressure photoionization (APPI) source, however, numerous parameters must be optimized for its coupling to CE. After evaluation of the sheath liquid composition and the CE capillary outlet position, an experimental design methodology was assessed for optimizing other ionization source parameters, such as sheath liquid flow rate, drying gas flow rate and temperature, nebulizing gas pressure, vaporizer temperature, and capillary voltage. For this purpose, a fractional factorial design (FFD) was selected as a screening procedure to identify factors which significantly influence sensitivity and efficiency. A face-centered central composite design (CCD) was then used to predict and optimize sensitivity, taking into account the most relevant variables. Sensitivity was finally evaluated with the optimized conditions and height-to-noise ratios (H/N) around 10 were achieved for an injection of 200 ng/mL of each analyte.
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Affiliation(s)
- Julie Schappler
- Laboratory of Analytical Pharmaceutical Chemistry, School of Pharmaceutical Sciences, EPGL, University of Geneva, University of Lausanne, Geneva, Switzerland
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45
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Kowalski P, Marszałł M, Olędzka I, Czarnowski W. Comparative Evaluation of CE and HPLC for Determination of Cotinine in Human Urine. Chromatographia 2007. [DOI: 10.1365/s10337-007-0331-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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46
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Smyth WF, Rodriguez V. Recent studies of the electrospray ionisation behaviour of selected drugs and their application in capillary electrophoresis–mass spectrometry and liquid chromatography–mass spectrometry. J Chromatogr A 2007; 1159:159-74. [PMID: 17512938 DOI: 10.1016/j.chroma.2007.05.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2006] [Revised: 04/23/2007] [Accepted: 05/01/2007] [Indexed: 11/26/2022]
Abstract
This review is concerned with recent studies of electrospray ionisation-mass spectrometry (ESI-MS) of selected small molecular mass drugs and their application in qualitative and quantitative analytical methods using the techniques liquid chromatography mass spectrometry (LC-ESI-MS) and capillary electrophoresis mass spectrometry (CE-ESI-MS). The publications reviewed are taken from the Web of Knowledge database for the year 2006. The drugs have molecular mass less than 1000 Da and are chosen according to selected drug classifications in which they give ESI signals primarily as [M+H]+ ions. The drug classifications are antibiotics/antibacterials, steroids, anti-tumour drugs, erectile dysfunction agents, anti-epileptic drugs, antiasthmatic drugs, psychoactive drugs and miscellaneous drugs. Details are given on the fragmentations, where available, that these ionic species exhibit in-source and in ion trap, triple quadrupole and time-of-flight mass spectrometers. Analytical methods for the detection and determination of these small molecular mass drug molecules are also discussed, where appropriate, under the particular drug classifications. Analytical information on, for example, sample concentration techniques, separation conditions, recoveries from biological media and limits of detection/quantitation (LODs and LOQs) are provided.
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Affiliation(s)
- W Franklin Smyth
- School of Biomedical Sciences, University of Ulster, Coleraine, Co Derry, BT52 1SA North Ireland UK.
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47
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Gottardo R, Fanigliulo A, Bortolotti F, De Paoli G, Pascali JP, Tagliaro F. Broad-spectrum toxicological analysis of hair based on capillary zone electrophoresis–time-of-flight mass spectrometry. J Chromatogr A 2007; 1159:190-7. [PMID: 17586513 DOI: 10.1016/j.chroma.2007.05.099] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2006] [Revised: 05/23/2007] [Accepted: 05/24/2007] [Indexed: 11/26/2022]
Abstract
The coupling of capillary electrophoresis-electrospray ionization and time-of-flight mass spectrometry, combining efficiency and speed of separation with high mass accuracy and fast scanning capability, was for the first time applied to the determination of drugs of abuse (amphetamine, methamphetamine, MDA, MDMA, ephedrine, cocaine, morphine, codeine) and their metabolites in hair (6-MAM, benzoylecgonine). Experimental conditions were as follows. Separation: voltage 15 kV, uncoated fused-silica capillary (75 microm ID, 100 cm total length), running electrolyte 25 mM ammonium formate, pH 9.5, field-amplified sample stacking injection. Forensic drugs could be identified by exact mass determination (mass accuracy typically < or = 5 ppm) and by match of the isotopic pattern. The method was fully validated, showing limit of detections (LODs) suitable for the determination of all the compounds below the cut-off usually adopted for hair analysis (0.1 ng/mg). Analytical precision in real matrices (tested at 0.1 and 1.0 ng/mg) was typically characterized by CV's < or = 24% in both intra-day and day-to-day experiments. Quantitative determination was also tested by using a single internal standard (folcodine). Results, although with a moderate accuracy, conceivably depending on the lack of deuterated internal standards, proved useful for diagnostic use of the results from hair analysis. A single liquid-liquid extraction procedure was applied for all analytes, allowing the detection of a broad spectrum of basic drugs and their major metabolites.
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Affiliation(s)
- Rossella Gottardo
- Department of Medicine and Public Health, Unit of Forensic Medicine, University of Verona, Verona, Italy
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48
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Uselová-Vceláková K, Zusková I, Gas B. Stability constants of amino acids, peptides, proteins, and other biomolecules determined by CE and related methods: Recapitulation of published data. Electrophoresis 2007; 28:2145-52. [PMID: 17607809 DOI: 10.1002/elps.200600780] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The stability (affinity, association, binding, complexation, formation) constant characterizes binding interaction between the analyte and the complexing agent. Knowledge of the stability constant makes possible the prediction and estimation of the binding behavior of constituents (amino acids, peptides, proteins, drugs, antibiotics, enzymes, enantiomers) to their partners, and the finding of a suitable partner for the given analyte to form a stable complex. The present paper summarizes the stability constant determination methods and the approaches used to evaluate the experimental data. Further, the paper recapitulates the published stability constant values determined, mainly, by capillary electrophoretic methods, taken from the Web of Science database covering the last decade. Details of the experimental conditions employed for the determination of the stability constants are also given. The review attempts to give a critical evaluation of the problems that accompany the determination of stability constant and discusses their solution.
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Affiliation(s)
- Katerina Uselová-Vceláková
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Prague, Czech Republic.
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49
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Luque-Garcia JL, Neubert TA. Sample preparation for serum/plasma profiling and biomarker identification by mass spectrometry. J Chromatogr A 2007; 1153:259-76. [PMID: 17166507 PMCID: PMC7094463 DOI: 10.1016/j.chroma.2006.11.054] [Citation(s) in RCA: 135] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2006] [Revised: 11/06/2006] [Accepted: 11/16/2006] [Indexed: 01/14/2023]
Abstract
In this article, we present an overview of the different strategies for sample preparation for identification by mass spectrometry (MS) of biomarkers from serum and/or plasma. We consider the effects of the variables involved in sample collection, handling and storage, and describe different approaches for removal of high abundance proteins and serum/plasma fractionation. We review the advantages and disadvantages of such techniques as centrifugal ultrafiltration, different formats for solid phase extraction, organic solvent extraction, gel and capillary electrophoresis, and liquid chromatography. We also discuss a variety of current proteomic methods and their main applications for biomarker-related studies.
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Affiliation(s)
| | - Thomas A. Neubert
- Skirball Institute of Biomolecular Medicine and Department of Pharmacology, New York University School of Medicine, New York, NY 10016, USA
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50
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Zamfir AD. Recent advances in sheathless interfacing of capillary electrophoresis and electrospray ionization mass spectrometry. J Chromatogr A 2007; 1159:2-13. [PMID: 17428492 DOI: 10.1016/j.chroma.2007.03.115] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2006] [Revised: 03/20/2007] [Accepted: 03/29/2007] [Indexed: 01/13/2023]
Abstract
On line sheathless capillary electrophoresis (CE)-electrospray ionization (ESI) mass spectrometry is developing as a powerful method in bioanalytics as it provides high resolution, sensitivity, relatively short analysis times, and amenability to a wide class of compounds. However, unlike the popular nano liquid chromatography (nano LC) or sheath-flow CE/ESI-MS, the sheathless coupling lacks standardized designs and protocols. For this reason, sheathless CE/ESI is a subject of conceptual and technical upgrading more than any other liquid-based separation method hyphenated to MS. Here, recent innovations in sheathless CE/ESI-MS interfacing are gathered in a survey covering the 2005/2006 period. In the first part of the review, the current concepts and methods for in-laboratory production of sturdy designs based on either conductive emitters or electrodeless interfaces are described. The second part is dedicated to microchip CE platforms with externally connected emitters for sheathless coupling to ESI-MS and advanced microfluidic devices integrating CE and sheathless electrospray in a single chip substrate. The advantages, limitations and feasibility for certain applications of all these systems as well as the perspectives for their performance improvement are concurrently assessed.
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Affiliation(s)
- Alina D Zamfir
- Department of Chemistry and Biology, University of Arad, Revolutiei Blvd. 1, RO-310139 Arad, Romania.
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