The Trouble With Kratom: Analytical and Interpretative Issues Involving Mitragynine

Area of Science:

• Forensic Toxicology
• Pharmacology
• Analytical Chemistry

Background:

• Mitragynine, the main alkaloid in Mitragyna speciosa (Kratom), is frequently encountered in forensic toxicology.
• Its toxicity is debated, with varying reports from Southeast Asia and Western societies.
• Sparse quantitative data in forensic casework may stem from analytical challenges like analyte stability and isomer separation.

Purpose of the Study:

• To describe a validated LC-MS/MS method for quantifying mitragynine in biological specimens.
• To present mitragynine concentrations from a large series of forensic blood samples.
• To illustrate the utility of accurate quantification in assessing potential mitragynine toxicity and adverse events.

Main Methods:

• Development and validation of a sensitive and specific liquid chromatography-tandem mass spectrometry (LC-MS/MS) method.
• Analysis of 1,001 blood specimens submitted to a forensic laboratory over 27 months.
• Case reports illustrating apparent adverse events and associated mitragynine concentrations.

Main Results:

• The LC-MS/MS method demonstrated sensitivity and specificity for mitragynine quantification.
• Mitragynine was detected in 1,001 blood specimens, with concentrations ranging from 5.6 to 29,000 ng/mL.
• Mean and median concentrations were 410 ± 1,124 ng/mL and 130 ng/mL, respectively.

Conclusions:

• Accurate and specific quantification of mitragynine is crucial for forensic casework.
• The validated method allows for reliable interpretation of mitragynine levels in biological samples.
• This supports the assessment of mitragynine's role in adverse events and toxicity investigations.