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Analytical method validation with development for the detection and quantification of kratom alkaloids using
Md Harunur Rashid1, Conor O'Croinin1, Tyson S Le1
1Faculty of Pharmacy & Pharmaceutical Sciences, Katz Centre for Pharmacy & Health Research, University of Alberta, Edmonton, Alberta, Canada.
Journal of Pharmacological and Toxicological Methods
|January 7, 2026
Summary
A new liquid chromatography-tandem mass spectrometry (LC-MS/MS) assay accurately quantifies kratom alkaloids in extracts. This validated method supports kratom product analysis, formulation development, and regulatory compliance for adulteration testing.
Area of Science:
- Analytical Chemistry
- Pharmacognosy
- Forensic Science
Background:
- Kratom (Mitragyna speciosa) contains numerous alkaloids with potential pharmacological effects.
- Accurate quantification of these alkaloids is crucial for product standardization and safety.
Purpose of the Study:
- To develop and validate a highly sensitive liquid chromatography-tandem mass spectrometry (LC-MS/MS) assay for detecting and quantifying kratom alkaloids.
- To establish a reliable analytical method for kratom-based products.
Main Methods:
- Utilized liquid chromatography-tandem mass spectrometry (LC-MS/MS) with electrospray positive ionization in multiple-reaction monitoring (MRM) mode.
- Employed a deuterated analog of mitragynine as an internal standard (IS).
- Optimized mobile phase composition, gradient program, and analytical column for efficient separation and detection.
Main Results:
- Successfully established an LC-MS/MS method for simultaneous quantification of multiple kratom alkaloids, including mitragynine, speciogynine, and 7-OH mitragynine.
- Achieved excellent linearity (R² > 0.99), a Lower Limit of Quantification (LLOQ) of 5 ng/mL, and a Limit of Detection (LOD) of 1.5 ng/mL.
- Demonstrated acceptable accuracy, precision, and stability, with reproducible quantification of alkaloids in kratom extracts.
Conclusions:
- The developed LC-MS/MS assay provides a standard analytical technique for kratom research and quality control.
- Applicable for testing drug release, dissolution, product comparison, and formulation development.
- Supports regulatory compliance and validated results in areas like kratom adulteration.
