Abstract
This paper describes the distribution of aromatic L-amino acid decarboxylase (AADC), using both L-DOPA and L-5-hydroxytryptophan (L-5-HTP) as substrates, in serum of various animals. The ratio of the activities of the enzyme towards both substrates was also determined in the same serum. AADC activity was discovered in serum using our new and highly sensitive assay for AADC activity by high-performance liquid chromatography (HPLC) with electrochemical detection (ED) with L-DOPA and L-5-HTP as substrates. It was found that among the species used, guinea pig serum had the highest activity, and we made a systematic study on guinea pig serum AADC.
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