Detection and quantification of cocaine metabolites in urine samples from horses administered cocaine.

The research investigates the detection and measurement of cocaine metabolites in horse urine samples after the administration of varying doses of cocaine, with observations suggesting the presence of these metabolites for extended periods following administration.

Objective of the Study

• The primary aim of this research was to detect and quantify the presence of cocaine metabolites in horse urine samples after the horses were given differing amounts of cocaine. The study also observed for any behavioural changes or alterations in heart rate in these horses post administration.

Methodology

• The study was carried out on four horses administered with varying doses of cocaine, namely 2.5 mg and 20 mg sublingually and 50 mg intravenously.
• Urinalysis was conducted using an enzyme-linked immunosorbent assay (ELISA) and gas chromatography-mass spectrometry (GC-MS). These are both standard laboratory techniques used to analyze biological samples.

Findings and Results

• Through ELISA, evidence of cocaine and its metabolites were found up to 10 hours post administration of 2.5 mg of cocaine, 48 hours post administration of 20 mg, and 72 hours after 50 mg administration.
• GC-MS analysis reaffirmed these findings, detecting the presence of benzoylecgonine (BZE), a metabolite of cocaine, in concentrations above the limit of quantification (5 ng/mL) in urine samples even 24 hours after administering 2.5 mg of cocaine, and upto 48 hours after administration of 20 and 50 mg instances.
• Despite the administration of cocaine, no noteworthy behavioral effects or obvious alterations in heart rate were observed in any of the horses.

Implications

• These results imply that cocaine and its associated metabolites remain detectable in a horse’s system for a considerable period post administration, ranging from 10 to 72 hours depending on the dose. This is of significant interest for monitoring the health and wellbeing of competition horses, particularly in relation to the abuse of performance-enhancing substances within competitive horse racing.
• However, the study observed no obvious deleterious effects on the horses in terms of behaviour or cardiac rhythm. Future studies might explore these elements in greater detail to fully comprehend the impact of cocaine ingestion by horses.