A novel analytical methodology for the determination and extraction of catecholamines (dopamine, epinephrine and norepinephrine) and their metabolites DL-3,4-dihydroxyphenyl glycol and...

Hormones have not been found in concentrations of orders of magnitude higher than nanograms per milliliter. This study reports urine concentrations of a catecholamine (norepinephrine) ranging from...