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Determination of mitragynine in urine matrices by bar adsorptive microextraction and HPLC analysis

Gas ChromatographySample PreparationBar Adsorptive MicroextractionMedicineMass SpectrometryToxicologyAnalytical ChemistryHplc AnalysisLiquid ChromatographyChromatographic AnalysisPharmacologyUrine MatricesChromatographyDrug Analysis