Long-term monitoring of clodronate in equine hair using liquid chromatography-tandem mass spectrometry.

This research paper focuses on the development of a method to detect the presence of the drug clodronate in horse hair for up to six months after administration. The results confirmed that despite some variability between individual horses, clodronate detection in hair was possible for a substantial duration in most cases.

Study Objective and Method

• The main aim of the research was to create a test that could accurately identify the administration of bisphosphonates (in this case specifically clodronate) in horses, a drug group heavily regulated due to potentially harmful effects on bone healing and horse health during training.
• Hair was chosen as the detection matrix due to its proven efficiency in tracing drug administration in horses over extended periods.
• In the study, seven horses were subjected to a single intramuscular injection of clodronate, and hair samples were taken before and recurrently up until six months after the injection.
• Using a method known as liquid chromatography-tandem mass spectrometry, the team then measured the concentration of clodronate within the hair samples.

Key Findings

• The results indicated that the drug was first detected seven days after administration, though it took up to 35 days for the drug to appear in some of the horses.
• Crucially, the findings showed that clodronate could still be detected six months post administration in four out of seven horses, confirming that hair could provide a suitable matrix for long-term detection of the drug.
• However, there were significant variances between individual horses in terms of detection time, ranging from 63 to 180 days.
• Additionally, there were several instances where the drug could not be detected at a certain time, only to be detected later on. This indicates that while detection is possible, it may not always be consistent or predictable across all horses.