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Highly sensitive and rapid determination of theophylline, theobromine and caffeine in human plasma and urine by gradient capillary high-performance liquid chromatography-frit-fast atom bombardment mass spectrometry

Rapid DeterminationBiochemistryGas ChromatographyMedicineMass SpectrometryHuman PlasmaAnalytical ChemistryLiquid ChromatographyChromatographic AnalysisPharmacologyHuman MetabolismPharmacokineticsChromatographyDrug Analysis