机译:An Improved Assay of Urinary Catecholamine Metabolites, 3-Methoxy-4-Hydroxyphenylglycol and Vanillylmandelic Acid, Using High Performance Liquid Chromatography With Electrochemical Detection
机译:Determination of Caffeine in Human Urine Samples Free of the Interference of its Metabolites by Reversed-Phase Liquid Chromatography Using Solid-Phase Extraction from Sample Clean-Up