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A comparison between mobile and stationary gas chromatography-mass spectrometry devices for analysis of complex volatile profiles. Anal Bioanal Chem 2023; 415:137-155. [PMID: 36396731 PMCID: PMC9672629 DOI: 10.1007/s00216-022-04391-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 08/25/2022] [Accepted: 10/18/2022] [Indexed: 11/18/2022]
Abstract
On-site analysis of volatile organic compounds (VOCs) with miniaturized gas chromatography-mass spectrometry (GC-MS) systems is a very rapidly developing field of application. While, on the one hand, major technological advances are improving the availability of these systems on the market, on the other hand, systematic studies to assess the performance of such instruments are still lacking. To fill this gap, we compared three portable GC-MS devices to a state-of-the-art benchtop (stationary) system for analysis of a standard mixture of 18 VOCs. We systematically compared analytical parameters such as the sensitivity and similarity of the signal response pattern and the quality of the obtained mass spectra. We found that the investigated mobile instruments (i) showed different response profiles with a generally lower number of identified analytes. Also, (ii) mass spectral reproducibility (% relative standard deviation (RSD) of the relative abundance of selective fragments) was generally worse in the mobile devices (mean RSD for all targeted fragments ~9.7% vs. ~3.5% in the stationary system). Furthermore, mobile devices (iii) showed a poorer mass spectral similarity to commercial reference library spectra (>20% deviation of fragment ion relative intensity vs. ~10% in the stationary GC-MS), suggesting a less reliable identification of analytes by library search. Indeed, (iv) the performance was better with higher-mass and/or more abundant fragments, which should be considered to improve the results of library searches for substance identification. Finally, (v) the estimation of the signal-to-noise ratio (S/N) in mobile instruments as a measure of sensitivity revealed a significantly lower performance compared to the benchtop lab equipment (with a ratio among medians of ~8 times lower). Overall, our study reveals not only a poor signal-to-noise ratio and poor reproducibility of the data obtained from mobile instruments, but also unfavorable results with respect to a reliable identification of substances when they are applied for complex mixtures of volatiles.
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Ozcagli E, Kara M, Kotil T, Fragkiadaki P, Tzatzarakis MN, Tsitsimpikou C, Stivaktakis PD, Tsoukalas D, Spandidos DA, Tsatsakis AM, Alpertunga B. Stanozolol administration combined with exercise leads to decreased telomerase activity possibly associated with liver aging. Int J Mol Med 2018; 42:405-413. [PMID: 29717770 PMCID: PMC5979936 DOI: 10.3892/ijmm.2018.3644] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 04/11/2018] [Indexed: 12/28/2022] Open
Abstract
Anabolic agents are doping substances which are commonly used in sports. Stanozolol, a 17α‑alkylated derivative of testosterone, has a widespread use among athletes and bodybuilders. Several medical and behavioral adverse effects are associated with anabolic androgenic steroids (AAS) abuse, while the liver remains the most well recognized target organ. In the present study, the hepatic effects of stanozolol administration in rats at high doses resembling those used for doping purposes were investigated, in the presence or absence of exercise. Stanozolol and its metabolites, 16‑β‑hydroxystanozolol and 3'‑hydroxystanozolol, were detected in rat livers using liquid chromatography‑mass spectrometry (LC‑MS). Telomerase activity, which is involved in cellular aging and tumorigenesis, was detected by examining telomerase reverse transcriptase (TERT) and phosphatase and tensin homolog (PTEN) expression levels in the livers of stanozolol‑treated rats. Stanozolol induced telomerase activity at the molecular level in the liver tissue of rats and exercise reversed this induction, reflecting possible premature liver tissue aging. PTEN gene expression in the rat livers was practically unaffected either by exercise or by stanozolol administration.
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Affiliation(s)
- Eren Ozcagli
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy and
| | - Mehtap Kara
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy and
| | - Tugba Kotil
- Department of Histology and Embryology, Faculty of Medicine, Istanbul University, Istanbul 34116, Turkey
| | - Persefoni Fragkiadaki
- Laboratory of Forensic Sciences and Toxicology, Medical School, University of Crete, 71003 Heraklion
| | - Manolis N. Tzatzarakis
- Laboratory of Forensic Sciences and Toxicology, Medical School, University of Crete, 71003 Heraklion
| | | | | | - Dimitrios Tsoukalas
- Laboratory of Forensic Sciences and Toxicology, Medical School, University of Crete, 71003 Heraklion
| | - Demetrios A. Spandidos
- Laboratory of Clinical Virology, Medical School, University of Crete, 71003 Heraklion, Greece
| | - Aristides M. Tsatsakis
- Laboratory of Forensic Sciences and Toxicology, Medical School, University of Crete, 71003 Heraklion
| | - Buket Alpertunga
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy and
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Sensitive detection of 3′-hydroxy-stanozolol glucuronide by liquid chromatography–tandem mass spectrometry. J Chromatogr A 2013; 1292:195-200. [DOI: 10.1016/j.chroma.2013.01.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Revised: 11/22/2012] [Accepted: 01/02/2013] [Indexed: 11/18/2022]
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Deshmukh NI, Zachar G, Petróczi A, Székely AD, Barker J, Naughton DP. Determination of stanozolol and 3'-hydroxystanozolol in rat hair, urine and serum using liquid chromatography tandem mass spectrometry. Chem Cent J 2012; 6:162. [PMID: 23259549 PMCID: PMC3542005 DOI: 10.1186/1752-153x-6-162] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Accepted: 12/18/2012] [Indexed: 01/25/2023] Open
Abstract
Background Anabolic androgenic steroids, such as stanozolol, are typically misused by athletes during preparation for competition. Out-of-competition testing presents a unique challenge in the current anti-doping detection system owing to logistic reasons. Analysing hair for the presence of a prohibited drug offers a feasible solution for covering the wider window in out-of-competition testing. To assist in vivo studies aiming to establish a relationship between drug levels detected in hair, urine and blood, sensitive methods for the determination of stanozolol and its major metabolite 3′-hydroxystanozolol were developed in pigmented hair, urine and serum, using brown Norway rats as a model system and liquid chromatography tandem mass spectrometry (LC-MS/MS). Results For method development, spiked drug free rat hair, blood and urine samples were used. The newly developed method was then applied to hair, urine and serum samples from five brown Norway rats after treatment (intraperitoneal) with stanozolol for six consecutive days at 5.0 mg/kg/day. The assay for each matrix was linear within the quantification range with determination coefficient (r2) values above 0.995. The respective assay was capable of detecting 0.125 pg/mg stanozolol and 0.25 pg/mg 3′-hydroxystanozolol with 50 mg hair; 0.063 ng/mL stanozolol and 0.125 ng/mL 3′-hydroxystanozolol with 100 μL of urine or serum. The accuracy, precision and extraction recoveries of the assays were satisfactory for the detection of both compounds in all three matrices. The average concentrations of stanozolol and 3′-hydroxystanozolol, were as follows: hair = 70.18 ± 22.32 pg/mg and 13.01 ± 3.43 pg/mg; urine = 4.34 ± 6.54 ng/mL and 9.39 ± 7.42 ng/mL; serum = 7.75 ± 3.58 ng/mL and 7.16 ± 1.97 ng/mL, respectively. Conclusions The developed methods are sensitive, specific and reproducible for the determination of stanozolol and 3′-hydroxystanozolol in rat hair, urine and serum. These methods can be used for in vivo studies further investigating stanozolol metabolism, but also could be extended for doping testing. Owing to the complementary nature of these tests, with urine and serum giving information on recent drug use and hair providing retrospective information on habitual use, it is suggested that blood or urine tests could accompany hair analysis and thus avoid false doping results.
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Affiliation(s)
- Nawed Ik Deshmukh
- School of Pharmacy and Chemistry, Kingston University, Penrhyn Road, Kingston upon Thames, Surrey, KT1 2EE, UK.
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Cserháti T. SIMULTANEOUS EFFECT OF ORGANIC MODIFIER AND PHYSICOCHEMICAL PARAMETERS OF SOME STEROIDAL DRUGS ON THEIR RETENTION ON A NARROW-BORE C 1 COLUMN. PART 2. J LIQ CHROMATOGR R T 2012. [DOI: 10.1080/10826076.2011.636467] [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)
- Tibor Cserháti
- a Research Institute of Materials and Environmental Chemistry, Chemical Research Centre, Hungarian Academy of Sciences , Budapest , Hungary
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Recent developments in MS for small molecules: application to human doping control analysis. Bioanalysis 2012; 4:197-212. [DOI: 10.4155/bio.11.305] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Recent developments in MS for the detection of small molecules in the context of doping control analysis are reviewed. Doping control analysis is evolving together with MS, which is the technique of choice in order to accomplish the analytical requirements in this field. Since these analytical requirements for the detection of a doping agent depend on the substance, in the first section we review the different scenarios. The commonly established approaches, together with their achievements and drawbacks are described. New developments in hyphenated MS techniques (both GC–MS/MS and LC–MS/MS) concerning interfaces and analyzers are mentioned. The use (or potential use) of these developments in order to minimize the limitations of the commonly established approaches in the doping control field is discussed. Finally, a brief discussion about trends and remaining limitations is presented.
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Pozo OJ, Van Eenoo P, Deventer K, Lootens L, Grimalt S, Sancho JV, Hernández F, Meuleman P, Leroux-Roels G, Delbeke FT. Detection and structural investigation of metabolites of stanozolol in human urine by liquid chromatography tandem mass spectrometry. Steroids 2009; 74:837-52. [PMID: 19464304 DOI: 10.1016/j.steroids.2009.05.004] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2009] [Revised: 05/07/2009] [Accepted: 05/08/2009] [Indexed: 11/29/2022]
Abstract
The applicability of LC-MS/MS in precursor ion scan mode for the detection of urinary stanozolol metabolites has been studied. The product ion at m/z 81 has been selected as specific for stanozolol metabolites without a modification in A- or N-rings and the product ions at m/z 97 and 145 for the metabolites hydroxylated in the N-ring and 4-hydroxy-stanozolol metabolites, respectively. Under these conditions, the parent drug and up to 15 metabolites were found in a positive doping test sample. The study of a sample from a chimeric uPA-SCID mouse collected after the administration of stanozolol revealed the presence of 4 additional metabolites. The information obtained from the product ion spectra was used to develop a SRM method for the detection of 19 compounds. This SRM method was applied to several doping positive samples. All the metabolites were detected in both the uPA-SCID mouse sample and positive human samples and were not detected in none of the blank samples tested; confirming the metabolic nature of all the detected compounds. In addition, the application of the SRM method to a single human excretion study revealed that one of the metabolites (4xi,16xi-dihydroxy-stanozolol) could be detected in negative ionization mode for a longer period than those commonly used in the screening for stanozolol misuse (3'-hydroxy-stanozolol, 16beta-hydroxy-stanozolol and 4beta-hydroxy-stanozolol) in doping analysis. The application of the developed approach to several positive doping samples confirmed the usefulness of this metabolite for the screening of stanozolol misuse. Finally, a tentative structure for each detected metabolite has been proposed based on the product ion spectra measured with accurate masses using UPLC-QTOF MS.
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Affiliation(s)
- Oscar J Pozo
- DoCoLab, UGent, Department of Clinical Chemistry, Microbiology and Immunology, Technologiepark 30, B-9052 Zwijnaarde, Belgium.
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Thevis M, Schänzer W. Synthetic anabolic agents: steroids and nonsteroidal selective androgen receptor modulators. Handb Exp Pharmacol 2009:99-126. [PMID: 20020362 DOI: 10.1007/978-3-540-79088-4_5] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The central role of testosterone in the development of male characteristics, as well as its beneficial effects on physical performance and muscle growth, has led to the search for synthetic alternatives with improved pharmacological profiles. Hundreds of steroidal analogs have been prepared with a superior oral bioavailability, which should also possess reduced undesirable effects. However, only a few entered the pharmaceutical market due to severe toxicological incidences that were mainly attributed to the lack of tissue selectivity. Prominent representatives of anabolic-androgenic steroids (AAS) are for instance methyltestosterone, metandienone and stanozolol, which are discussed as model compounds with regard to general pharmacological aspects of synthetic AAS. Recently, nonsteroidal alternatives to AAS have been developed that selectively activate the androgen receptor in either muscle tissue or bones. These so-called selective androgen receptor modulators (SARMs) are currently undergoing late clinical trials (IIb) and will be prohibited by the World Anti-Doping Agency from January 2008. Their entirely synthetic structures are barely related to steroids, but particular functional groups allow for the tissue-selective activation or inhibition of androgen receptors and, thus, the stimulation of muscle growth without the risk of severe undesirable effects commonly observed in steroid replacement therapies. Hence, these compounds possess a high potential for misuse in sports and will be the subject of future doping control assays.
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Affiliation(s)
- Mario Thevis
- Center for Preventive Doping Research - Institute of Biochemistry, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933, Cologne, Germany.
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Hauser B, Deschner T, Boesch C. Development of a liquid chromatography–tandem mass spectrometry method for the determination of 23 endogenous steroids in small quantities of primate urine. J Chromatogr B Analyt Technol Biomed Life Sci 2008; 862:100-12. [DOI: 10.1016/j.jchromb.2007.11.009] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2007] [Revised: 10/04/2007] [Accepted: 11/07/2007] [Indexed: 10/22/2022]
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Thevis M, Makarov AA, Horning S, Schänzer W. Mass spectrometry of stanozolol and its analogues using electrospray ionization and collision-induced dissociation with quadrupole-linear ion trap and linear ion trap-orbitrap hybrid mass analyzers. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2005; 19:3369-78. [PMID: 16259046 DOI: 10.1002/rcm.2204] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Mass spectrometric identification and characterization of growth-promoting anabolic-androgenic steroids in biological matrices has been a major task for doping control as well as food safety laboratories. The fragmentation behavior of stanozolol, its metabolites 17-epistanozolol, 3'-OH-stanozolol, 4alpha-OH-stanozolol, 4beta-OH-stanozolol, 17-epi-16alpha-OH-stanozolol, 16alpha-OH-stanozolol, 16beta-OH-stanozolol, as well as the synthetic analogues 4-dehydrostanozolol, 17-ketostanozolol, and N-methyl-3'-OH-stanozolol, was investigated after positive electrospray ionization and subsequent collision-induced dissociation utilizing a quadrupole-linear ion trap and a novel linear ion trap-orbitrap hybrid mass spectrometer. Stable isotope labeling, H/D-exchange experiments, MS3 analyses and high-resolution/high mass accuracy measurements of fragment ions were employed to allow proposals for charge-driven as well as charge-remote fragmentation pathways generating characteristic product ions of stanozolol at m/z 81, 91, 95, 105, 119, 135 and 297 and 4-hydroxylated stanozolol at m/z 145. Fragment ions were generated by dissociation of the steroidal A- and B-ring retaining the introduced charge within the pyrazole function of stanozolol and by elimination of A- and B-ring fractions including the pyrazole residue. In addition, a charge-remote fragmentation causing the neutral loss of methanol was observed, which was suggested to be composed by the methyl residue at C-18 and the hydroxyl function located at C-17.
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Affiliation(s)
- Mario Thevis
- Institute of Biochemistry and the Competence Center for Preventive Anti-Doping Research, German Sport University Cologne, Carl-Diem Weg 6, 50933 Cologne, Germany.
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