Quantitation of fluphenazine in equine serum following fluphenazine decanoate administration.

This research involved developing and validating a method to detect and measure the amount of fluphenazine, a potent antipsychotic drug used to improve performance in racehorses, in horse blood serum. This method was then used on serum samples collected from three horses, revealing that fluphenazine can be detected for up to 14 days after administration.

Development and Validation of Detection Method

• The researchers developed a method of detecting and quantifying fluphenazine in equine serum using liquid chromatography-tandem mass spectrometry.
• To ensure that their detection method was accurate and reliable, they conducted validation tests, which showed that fluphenazine remained stable in both unprocessed and processed samples, including samples subjected to up to three freeze-thaw cycles. This indicates that even if the samples had to be frozen and thawed for testing, the presence of the drug would not be affected.

Determination of Detection Limit and Precision

• The limit of detection and lower limit of quantitation for fluphenazine were established at 0.05 and 0.1 nanograms per milliliter (ng/mL) respectively. This means that the method developed by the researchers can reliably detect and accurately measure fluphenazine presence in the serum within these limits.
• Precision, or the extent to which repeated measurements under unchanged conditions show the same results, was determined to be 27.2% at the 0.2 ng/mL level and 18.1% at the 2 ng/mL level. This suggests a high degree of repeatability and reproducibility of the test.

Detection of Fluphenazine in Serum Samples

• Using their validated method, the scientists then measured the amount of fluphenazine in serum samples collected from three horses following administration of fluphenazine decanoate.
• The serum concentrations of fluphenazine were found to be detectable for up to 14 days post-administration in two of the three horses. This finding is crucial because it helps determine how long the drug stays in the horse’s bloodstream.
• The highest detected fluphenazine level was 1.4 ng/mL, underlining that the drug can be present in substantial amounts, which further confirms the necessity of the developed detection method.