Development of a Standardized Microflow LC Gradient to Enable Sensitive and Long-Term Detection of Synthetic Anabolic-Androgenic Steroids for High-Throughput Doping Controls.

The research article presents a new method for detecting Synthetic Anabolic-Androgenic Steroids (AAS), specifically stanozolol, at low levels and for extended periods of time in complex biological samples. This method, achieved through the application of a novel elution procedure tied to quaternary liquid chromatography technology, can help enhance anti-doping measures by better identifying and tracing banned substances in sport and racing activities.

Background

• The study focuses on Synthetic Anabolic-Androgenic Steroids (AAS), including stanozolol, which are substances prohibited in sporting and racing events. These steroids, when abused, can grant unfair competitive advantages.
• Due to these inherent risks, anti-doping authorities continuously seek analytical improvements to detect these compounds in athletes’ biological samples (e.g., urine, blood, hair) more effectively and reliably.

Research Method

• The researchers used advanced chromatographic procedures linked to quaternary liquid chromatography, specifically designed for high-throughput standardized proteomics.
• The main innovation lay in the novel elution procedures applied to the detection process. These procedures enhanced the capability of current systems to detect stanozolol and its metabolites within complex matrices like body fluids or mane sections of a horse.

Findings and Implications

• The new method enhanced detection sensitivity, enabling the identification of 16β-hydroxy-stanozolol, a stanozolol metabolite, at levels as low as 10 pg/mL in equine urine. These traces were detectable up to three months after a microdosing administration, a drastic improvement compared to previous methods.
• Further testing showed that a single dose of stanozolol and its metabolites could be traced for a lengthy period of five months on horse mane sections. This development has far-reaching implications for horse racing, where doping controls can be stricter and more precise.
• The study has significant implications not only for doping control labs, but also in residue analysis, toxicology, and metabolomics, where detecting low concentrations of specific substances is critical.
• The chromatographic method developed in this study can be utilized freely within the Evosep Plus program, promoting its implementation in multiple fields.