Improving Detection of Anabolic Steroids in Sports: Simultaneous Detection of Intact Phase I and Phase II Urinary Metabolites by UPLC-MS/MS

Significance of the Topic

Anabolic androgenic steroids (AAS) misuse undermines sports integrity and athlete health, requiring sensitive and comprehensive analytical tools. Conventional screening relies on hydrolyzing and derivatizing urine to detect only certain metabolites, leaving many intact phase II conjugates undetected. This novel UPLC-MS/MS method expands detection scope, improving anti-doping measures.

Aims and Overview of the Study

This work aimed to develop and validate a streamlined screening strategy for simultaneous detection of intact phase I and phase II (glucuronide and sulfate) urinary metabolites of various AAS. The study evaluated sample preparation simplification, extended detection windows, and practical applicability to excretion and authentic samples.

Methodology and Instrumentation Used

Sample preparation employed simple solid phase extraction on C18 cartridges without enzymatic hydrolysis or derivatization. Chromatographic separation was achieved on an ACQUITY UPLC BEH C18 column with a water–acetonitrile/formic acid–ammonium formate gradient. Detection utilized a Xevo TQ MS in MRM mode, operating in both positive and negative electrospray ionization. Internal standards included deuterated analogues of representative steroids.

Main Results and Discussion

The method readily ionized unconjugated, glucuronide, and sulfate metabolites, selecting specific MRM transitions to maximize signal-to-noise and selectivity. Validation demonstrated limits of detection between 0.25 and 4 ng/mL for most analytes, extraction recoveries above 77%, intraday precision better than 21%, and manageable matrix effects. Application to excretion studies showed that key sulfate metabolites of methyltestosterone were detectable up to 23 days post-dosing, compared to only 4–6 days with conventional methods. Similarly, a long-term glucuronide marker for stanozolol was observed up to 21 days.

Benefits and Practical Applications

• Broader detection window through intact monitoring of phase II metabolites
• Elimination of hydrolysis and derivatization, simplifying workflow
• High recovery and precision ensure reliable screening in anti-doping labs
• Adaptable to emerging metabolites without method overhaul

Future Trends and Opportunities

The flexibility of UPLC-MS/MS enables incorporation of novel steroid metabolites as they are identified, including potential automation via on-line SPE. Integration with high-resolution mass spectrometry and data-driven multiplex screening could further enhance sensitivity and throughput in anti-doping controls.

Conclusion

The developed UPLC-MS/MS method offers a robust, streamlined, and highly sensitive platform for comprehensive detection of intact AAS metabolites in urine. By extending detection windows and simplifying sample preparation, this approach represents a significant advancement in doping analysis.

Reference

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