Enzymatic degradation of Dopamine by monoamine oxidase

Alternately dopamine is metabolized to homovanillic acid in a two-step reaction in which dopamine is first oxidized to 3,4-dihydroxypheylacetic acid (DOPAC) and then converted to homovanillic acid by catecholamine o-methyltransferase.

多巴胺经两步反应代谢为香草酸，首先在多巴胺脱氢酶的作用下氧化为3,4-二羟基苯乙酸（DOPAC），随后在儿茶酚-O-甲基转移酶的作用下转化为香草酸。