detection limits for biogenic amines , serotonin ( 5-ht ) , 5-hydroxyindoleacetic acid , 5-hydroxytryptophan , norepinephrine , epinephrine , dopamine and 3,4-dihydroxyphenylacetic acid ( dopac ) , of 50-200 fg are reported .
C0028351
norepinephrine
C0014563
epinephrine