Rapid and sensitive analysis of 3,4-methylenedioxypyrovalerone in equine plasma using liquid chromatography-tandem mass spectrometry.

This research has developed a quick yet sensitive method for detecting a potent horse stimulant and banned substance, 3,4-Methylenedioxypyrovalerone (MDPV), in horse plasma, using liquid chromatography-tandem mass spectrometry.

Objective and Purpose of the Research

• The primary goal of this study was to create an efficient, sensitive liquid chromatography-tandem mass spectrometry method to identify and quantify the psychoactive drug 3,4-Methylenedioxypyrovalerone (MDPV) in equine plasma. MDPV is a potent stimulant with a high potential for abuse and has recently been classified as a banned substance in racing horses because of its absence of therapeutic value. With this method, authorities can enforce the ban more effectively.

Methodology Employed

• The researchers prepared the equine plasma samples through a liquid-liquid extraction process.
• They analysed the extracted samples using a special instrument called a triple-quadrupole linear ion trap mass spectrometer. This was done in positive multiple-reaction-monitoring and enhanced product ion scan modes to ensure a thorough analysis.
• The method was validated for accuracy and precision, along with other validation parameters including stability, extraction recovery, matrix effect, and dilution accuracy.

Key Findings

• The extraction recovery, which measures how much of the substance of interest is retrieved from the sample, was more than 90% by using this method.
• The linearity of the concentration response was measured from 5 to 15,000 picograms per millilitre (pg/mL).
• The limit of detection (LOD), the smallest measurement that can be made with certainty, and limit of quantification (LOQ), the lowest concentration or mass of analyte that can be reliably measured by an analytical procedure, were found to be 2 and 5 picograms per millilitre (pg/mL) respectively.
• Both intra-day and inter-day accuracies were nearly 100%, indicating this method can accurately measure MDPV in various sample sets, within and across many days.
• Notably, this method is appropriate for broad use, from initial screening, to quantification and final confirmation of MDPV in equine plasma, and was successful in detecting the substance in post-competition plasma samples.