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Zapata-Linares J, Gervasini G. Contaminants in Dietary Supplements: Toxicity, Doping Risk, and Current Regulation. Int J Sport Nutr Exerc Metab 2024; 34:232-241. [PMID: 38653450 DOI: 10.1123/ijsnem.2023-0263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 02/09/2024] [Accepted: 03/06/2024] [Indexed: 04/25/2024]
Abstract
Athletes, both amateur and professional, often resort to the consumption of nutritional supplements without professional supervision and without being aware of the risks they may entail. We conducted an exhaustive literature search to determine the most common substances found as contaminants in dietary supplements. For each substance, we analyzed its mechanism of action, clinical indication, health risk, and putative use as doping agent. In addition, we evaluated the current regulation of these supplements. Contamination of nutritional supplements (accidental or intentional), especially with steroids and stimulants, is a hazardous situation. The prolonged consumption of these products without being aware of their composition can cause serious health risks and, in the case of professional athletes, a possible sanction for doping.
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Affiliation(s)
- Jesús Zapata-Linares
- Faculty of Medicine and Health Sciences, Division of Pharmacology, Department of Medical and Surgical Therapeutics, School of Medicine and Health Sciences, University of Extremadura, Badajoz, Spain
| | - Guillermo Gervasini
- Faculty of Medicine and Health Sciences, Division of Pharmacology, Department of Medical and Surgical Therapeutics, School of Medicine and Health Sciences, University of Extremadura, Badajoz, Spain
- Instituto Universitario de Biomarcadores de Patologías Moleculares, University of Extremadura, Badajoz, Spain
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2
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Dos Santos VF, Carneiro GRA, Braz BF, Santelli RE, de Paula Machado S, Gualberto Pereira HM. Coordination chemistry applied to anti-doping analysis: Cobalt quantification as its diethyldithiocarbamate complex by liquid chromatography coupled to high resolution tandem mass spectrometry. Drug Test Anal 2023; 15:1392-1402. [PMID: 37641464 DOI: 10.1002/dta.3571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 08/14/2023] [Accepted: 08/15/2023] [Indexed: 08/31/2023]
Abstract
Cobalt was included on the World Anti-Doping Agency Prohibited List in 2015 due to its effect on stimulus of erythropoiesis via stabilization of hypoxia-inducible factor. Although it has proven benefits for performance enhancement, the unavailability of inductively coupled plasma-mass spectrometry on routine of the accredited laboratories is a factor that reduces its applicability in anti-doping analysis. Therefore, an analytical method for quantification of urinary cobalt as its diethyldithiocarbamate complex by liquid chromatography coupled with high-resolution tandem mass spectrometry was developed and validated. Palladium was proposed as internal standard and rhodium as a complexation control. A microwave-assisted acid digestion of the urine samples was essential, not only to eliminate the matrix effect but mainly to avoid the non-specific bond of cobalt to endogenous molecules. A linear method was obtained over the studied range from a negative urine control to a spiked concentration of 25 ng/mL, with an estimated limit of quantification of 2.5 ng/mL, and an adequate combined standard uncertainty of 11.4%. Considering that all reagents are commercially available, the proposed strategy is feasible to be included on routine sample preparation. Monitoring urinary cobalt concentrations globally opens the perspective to support the anti-doping system to define a suitable threshold value and to understand its potential misuse by athletes seeking for performance improvement.
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Affiliation(s)
- Vanessa Farelo Dos Santos
- Laboratório Brasileiro de Controle de Dopagem, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Laboratório de Química Inorgânica Computacional, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gabriel Reis Alves Carneiro
- Laboratório Brasileiro de Controle de Dopagem, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Bernardo Ferreira Braz
- Laboratório de Desenvolvimento Analítico, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Ricardo Erthal Santelli
- Laboratório de Desenvolvimento Analítico, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Sérgio de Paula Machado
- Laboratório de Química Inorgânica Computacional, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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Evans E, Walhin JP, Hengist A, Betts JA, Dearlove DJ, Gonzalez JT. Ketone monoester ingestion increases postexercise serum erythropoietin concentrations in healthy men. Am J Physiol Endocrinol Metab 2023; 324:E56-E61. [PMID: 36449571 PMCID: PMC9870573 DOI: 10.1152/ajpendo.00264.2022] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/18/2022] [Accepted: 11/28/2022] [Indexed: 12/02/2022]
Abstract
Intravenous ketone body infusion can increase erythropoietin (EPO) concentrations, but responses to ketone monoester ingestion postexercise are currently unknown. The purpose of this study was to assess the effect of ketone monoester ingestion on postexercise erythropoietin (EPO) concentrations. Nine healthy men completed two trials in a randomized, crossover design (1-wk washout). During trials, participants performed 1 h of cycling (initially alternating between 50% and 90% of maximal aerobic capacity for 2 min each interval, and then 50% and 80%, and 50% and 70% when the higher intensity was unsustainable). Participants ingested 0.8 g·kg-1 sucrose with 0.4 g·kg-1 protein immediately after exercise, and at 1, 2, and 3 h postexercise. During the control trial (CONTROL), no further nutrition was provided, whereas on the ketone monoester trial (KETONE), participants also ingested 0.29 g·kg-1 of the ketone monoester (R)-3-hydroxybutyl (R)-3-hydroxybutyrate immediately postexercise and at 1 and 2 h postexercise. Blood was sampled immediately postexercise, every 15 min in the first hour and hourly thereafter for 4 h. Serum EPO concentrations increased to a greater extent in KETONE than in CONTROL (time × condition interaction: P = 0.046). Peak serum EPO concentrations were higher with KETONE (means ± SD: 9.0 ± 2.3 IU·L-1) compared with CONTROL (7.5 ± 1.5 IU·L-1, P < 0.01). Serum β-hydroxybutyrate concentrations were also higher, and glucose concentrations lower, with KETONE versus CONTROL (both P < 0.01). In conclusion, ketone monoester ingestion increases postexercise erythropoietin concentrations, revealing a new avenue for orally ingestible ketone monoesters to potentially alter hemoglobin mass.NEW & NOTEWORTHY To our knowledge, this study was the first to assess the effects of ketone monoester ingestion on erythropoietin concentrations after exercise. We demonstrated that ingestion of a ketone monoester postexercise increased serum erythropoietin concentrations and reduced serum glucose concentrations in healthy men. These data reveal the possibility for ketone monoesters to alter hemoglobin mass.
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Affiliation(s)
- Eric Evans
- Centre for Nutrition, Exercise and Metabolism, University of Bath, Bath, United Kingdom
| | - Jean-Philippe Walhin
- Centre for Nutrition, Exercise and Metabolism, University of Bath, Bath, United Kingdom
- Department for Health, University of Bath, Bath, United Kingdom
| | - Aaron Hengist
- Centre for Nutrition, Exercise and Metabolism, University of Bath, Bath, United Kingdom
- Department for Health, University of Bath, Bath, United Kingdom
| | - James A Betts
- Centre for Nutrition, Exercise and Metabolism, University of Bath, Bath, United Kingdom
- Department for Health, University of Bath, Bath, United Kingdom
| | - David J Dearlove
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Churchill Hospital, University of Oxford, Oxford, United Kingdom
| | - Javier T Gonzalez
- Centre for Nutrition, Exercise and Metabolism, University of Bath, Bath, United Kingdom
- Department for Health, University of Bath, Bath, United Kingdom
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Guefai FZ, Martínez-Rodríguez A, Grindlay G, Mora J, Gras L. Elemental bioavailability in whey protein supplements. J Food Compost Anal 2022. [DOI: 10.1016/j.jfca.2022.104696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Sobolevsky T, Ahrens B. Measurement of urinary cobalt as its complex with 2-(5-chloro-2-pyridylazo)-5-diethylaminophenol by liquid chromatography-tandem mass spectrometry for the purpose of anti-doping control. Drug Test Anal 2021; 13:1145-1157. [PMID: 33484083 DOI: 10.1002/dta.3004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 01/18/2021] [Accepted: 01/20/2021] [Indexed: 01/23/2023]
Abstract
Cobalt is well known for its ability to stimulate erythropoiesis via stabilization of hypoxia-inducible factors. In sports, this can provide a competitive benefit to athletes, so the World Anti-Doping Agency prohibits the use of cobalt in any form except its cobalamin vitamers. As of now, cobalt in biological fluids is detected by inductively coupled plasma mass spectrometry (ICP-MS), a technique which has very limited availability in anti-doping laboratories. Therefore, a quantitative method based on liquid chromatography-tandem mass spectrometry capable of measuring urinary cobalt in the form of its complex with 2-(5-chloro-2-pyridylazo)-5-diethylaminophenol (5-Cl-PADAP) has been developed and validated. A cobalt complex with deuterium-labeled 5-Cl-PADAP was used as internal standard. The method was found linear over the concentration range of 5-500 ng/ml with a combined standard uncertainty less than 10% at 15, 200, and 450 ng/ml. Stability of cobalt ions in urine was investigated over the course of 2 months; the concentration of free Co2+ was observed to decline by approximately 50% but restored upon hydrolysis with hydrochloric acid. Unlike ICP-MS, this method is practically unaffected by the presence of cyanocobalamin as the latter is resistant to acid hydrolysis. Notwithstanding the lack of formalized threshold concentration of cobalt in urine, it is highly desirable that more anti-doping laboratories engage in testing for cobalt levels to better understand the prevalence of cobalt misuse in athletes. Given that cobalt salts are inexpensive and easily obtainable, the risk of such abuse should not be underestimated.
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Affiliation(s)
- Tim Sobolevsky
- UCLA Olympic Analytical Laboratory, Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, California, Los Angeles, USA
| | - Brian Ahrens
- UCLA Olympic Analytical Laboratory, Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, California, Los Angeles, USA
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Knoop A, Planitz P, Wüst B, Thevis M. Analysis of cobalt for human sports drug testing purposes using ICP‐ and LC‐ICP‐MS. Drug Test Anal 2020; 12:1666-1672. [DOI: 10.1002/dta.2962] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 10/26/2020] [Accepted: 10/27/2020] [Indexed: 12/13/2022]
Affiliation(s)
- Andre Knoop
- Institute of Biochemistry, Center for Preventive Doping Research German Sport University Cologne Cologne Germany
| | - Peter Planitz
- Agilent Technologies GmbH und Co. KG Waldbronn Germany
| | - Bernhard Wüst
- Agilent Technologies GmbH und Co. KG Waldbronn Germany
| | - Mario Thevis
- Institute of Biochemistry, Center for Preventive Doping Research German Sport University Cologne Cologne Germany
- European Monitoring Center for Emerging Doping Agents (EuMoCEDA) Cologne/Bonn Germany
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SCHMIDT WALTERFJ, HOFFMEISTER TORBEN, HAUPT SANDRA, SCHWENKE DIRK, WACHSMUTH NADINEB, BYRNES WILLIAMC. Chronic Exposure to Low-Dose Carbon Monoxide Alters Hemoglobin Mass and V˙O2max. Med Sci Sports Exerc 2020; 52:1879-1887. [DOI: 10.1249/mss.0000000000002330] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Thevis M, Walpurgis K, Thomas A. Analytical Approaches in Human Sports Drug Testing: Recent Advances, Challenges, and Solutions. Anal Chem 2019; 92:506-523. [DOI: 10.1021/acs.analchem.9b04639] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Mario Thevis
- Center for Preventive Doping Research, Institute of Biochemistry, German Sport University Cologne, Am Sportpark Müngersdorf 6, Cologne 50933, Germany
- European Monitoring Center for Emerging Doping Agents (EuMoCEDA), Cologne 50933, Germany
| | - Katja Walpurgis
- Center for Preventive Doping Research, Institute of Biochemistry, German Sport University Cologne, Am Sportpark Müngersdorf 6, Cologne 50933, Germany
| | - Andreas Thomas
- Center for Preventive Doping Research, Institute of Biochemistry, German Sport University Cologne, Am Sportpark Müngersdorf 6, Cologne 50933, Germany
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