Direct detection of boldenone sulfate and glucuronide conjugates in horse urine by ion trap liquid chromatography-mass spectrometry.

The research paper discusses a study on how horses metabolize the anabolic agent boldenone, and how this can be detected in horse urine using ion trap liquid chromatography-mass spectrometry.

Study Overview

• The research team carried out a study on the “phase II” metabolism of an anabolic agent called boldenone in horses.
• In this context, “phase II” metabolism refers to the process where the body changes a drug (in this case, boldenone) to make it more water soluble, so it can be excreted in urine.
• The team synthesised boldenone sulfate, boldenone glucuronide and their C17-epimers as reference standards in their laboratory. C17-epimers are chemically similar to the original substances, but are different in their molecular orientation.

Method Development

• After synthesising these compounds, the researchers then developed a method to detect them in a horse urine matrix.
• To purify these analytes (the substances being examined), a solid phase extraction process was used. This process isolates the analytes from their solutions.
• The detection of the analytes was carried out using an ion trap liquid chromatography-mass spectrometry method (LC/MS). This is a high-precision analytical method commonly used in drug testing.

Results and Conclusion

• The researchers used negative and positive ionisation mode MS(2) to detect sulfate and glucuronide conjugates respectively. These are the modified forms of the drug that the horse’s body produces to make it water-soluble.
• They found that after administering boldenone undecylenate to horses by intramuscular injection, boldenone sulfate and 17-epiboldenone glucuronide were detected in the horse urine samples as the major and minor phase II metabolites respectively.
• This suggests that these two compounds could be key indicators of boldenone use in horses, which is significant because boldenone is often used illegally to enhance performance in horse racing.