Abstract
1. The amino acid l-3,4-dihydroxyphenylalanine ( l-DOPA) was extracted from tentacles of the sea anemone Metridium senile and from brains of the crayfish Pacifastacus leniuscuius. 2. The identity of l-DOPA was ascertained by gas chromatography-mass spectrometry as the heptafluorobutyryl iso-butyl ester derivative. Dopa is identified with GC-MS for the first time and the derivatization is a novel modification. 3. The results display a capability of invertebrate neurons to accumulate l-DOPA, the precursor of biogenic amines, like the biogenic amines themselves.
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