Solid Phase ExtractionInorganic ChemicalsBurseraceaeCalibrationTandem Mass SpectrometryChromatography, High Pressure LiquidChromatography, LiquidAcanthopanaxLimit of DetectionReproducibility of ResultsSpectrophotometry, AtomicReference StandardsGas Chromatography-Mass SpectrometryMass SpectrometrySpectrometry, Mass, Electrospray IonizationSensitivity and SpecificityWater Pollutants, ChemicalIndicators and ReagentsChemistry, OrganicPhenolsMolecular StructureChemistry, ClinicalChemistry Techniques, SyntheticSolid Phase MicroextractionSolid-Phase Synthesis TechniquesBiological ProductsHistory, 19th CenturyChemistry Techniques, AnalyticalHistory, 20th CenturyHistory, 18th CenturySpectrophotometry, UltravioletTooth Extraction