we describe a method for determining the `` '' total '' '' excretion of acidic metabolites of catecholamines by measuring 3,4-dihydroxyphenylacetic acid ( dopac ) formed by hydriodic acid hydrolysis of 4-hydroxy-3-methoxyphenylacetic acid ( hva ) , 4-hydroxy-3-methoxymandelic acid ( vma ) , and their conjugates .
C0001128
f acid
C0063090
hydriodic ac