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Optimization of a solid phase extraction and hydrophilic interaction liquid chromatography–tandem mass spectrometry method for the determination of metformin in dietary supplements and herbal medicines

Herbal MedicinesDietary SupplementsSolid Phase ExtractionBiochemistryGas ChromatographyMedicineBioanalysisMass SpectrometryAnalytical ChemistryLiquid ChromatographyChromatographic AnalysisPharmacologyChromatographyDrug Analysis