a procedure is described for simultaneous estimation of tryptophan ( tp ) , 5-hydroxytryptophan ( 5-ohtp ) , 5-hydroxytryptamine ( 5-ht ) , 5-hydroxyindoleacetic acid ( 5-hiaa ) , n-acetyl 5-hydroxytryptamine ( na5-ht ) and n-acetyldopamine ( nada ) using high performance liquid chromatography with coulometric electrochemical detection .
C0041249
tryptophan
C0000578
5-hydroxytryptophan