epinephrine formed enzymatically from the substrate norepinephrine and isoproterenol ( internal standard ) , after chromatography on a small cartridge of a cation exchanger , toyopak sp , are converted into the corresponding fluorescent compounds by reaction with 1,2-diphenylethylenediamine , a selective fluorescence derivatization reagent for catechol compounds .
C0014563
epinephrine
C0028351
norepinephrine