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Preparative isolation of antioxidative compounds from Dracocephalum heterophyllum using off-line two-dimensional reversed-phase liquid chromatography/hydrophilic interaction chromatography guided by on-line HPLC-DPPH assay

Preparative IsolationBiochemistryBioassay-guided IsolationMedicineBioanalysisDracocephalum HeterophyllumAnalytical ChemistryPhytochemicalOn-line Hplc-dpph AssayPhytochemistryPharmacologyChromatography