comparison of the methods of determination of conjugated catecholamines shows that , despite their variable absolute values , the relative proportions of the free and conjugated dopamine , norepinephrine and epinephrine are close ( mean of 97.3 % of dopamine , 73 % of norepinephrine and 84 % of epinephrine being conjugated ) and these proportions remain similar whether acid or sulphatase hydrolysis is used .
C0007412
catecholamines
C0013030
dopamine