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Highly sensitive and selective pre-column derivatization high-performance liquid chromatography approach for rapid determination of triterpenes oleanolic and ursolic acids and application to Swertia species: Optimization of triterpenic acids extraction and pre-column derivatization using response surface methodology

Gas ChromatographyResponse Surface MethodologySwertia SpeciesMedicineMass SpectrometryPhytochemistryAnalytical ChemistryPhytochemicalLiquid ChromatographyChromatographic AnalysisPharmacologyPre-column DerivatizationChromatography