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Simultaneous determination of N-oxides and free bases of pyrrolizidine alkaloids by cation-exchange solid-phase extraction and ion-pair high-performance liquid chromatography

Solvent ExtractionChemical MeasurementEngineeringBiochemistryCation-exchange Solid-phase ExtractionMedicineGas ChromatographyOrganic ChemistryAnalytical ChemistryPyrrolizidine AlkaloidsLiquid ChromatographyChemistryFree BasesChromatographic AnalysisPharmacologyChromatographyDrug Analysis