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Determination of theobromine, theophylline and caffeine in cocoa samples by a high-performance liquid chromatographic method with on-line sample cleanup in a switching-column system

Food ChemistryGas ChromatographyCocoa SamplesMedicineAnalytical ChemistrySwitching-column SystemOn-line Sample CleanupLiquid ChromatographyChromatographic AnalysisPharmacologyChromatographyDrug Analysis