We report a sensitive and reliable assay for the determination of the urinary catecholamines norepinephrine, epinephrine and dopamine, based on selective extraction by a liquid-liquid extraction procedure, followed by selective derivatization with the fluorigenic agent 1,2-diphenylethylenediamine and quantification by high-performance liquid chromatography with fluorimetric detection. Comparison with a method using electrochemical detection shows that interference of an unknown compound, most probably N-methylepinephrine, which is an often-overlooked problem with methods using electrochemical detection and results in falsely high epinephrine concentrations, does not occur with the described fluorimetric method.
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