in different regions of the cns 5-hydroxytryptophan ( 5-htp ) , 5-hydroxytryptamine ( 5-ht ) and 5-hydroxyindoleacetic acid ( 5-hiaa ) , were analysed by hplc-technique with electrochemical detection , while dihydroxyphenylalanine ( dopa ) , dopamine ( da ) and norepinephrine ( ne ) were analysed with a radio enzymatic method after blocking the decarboxylation of 5-htp to 5-ht and dopa to da by inhibition of the aromatic amino acid decarboxylase enzyme with m-hydroxybenzylhydrazine ( nsd 1015 ) in order to estimate the synthesis rate of 5-hydroxyindoles and catecholamines .
C0013023
dopa
C0007412
catecholamines