Abstract
Abstract Examination of those plant extracts which were previously found (Feng and others, 1962) to have transient depressor activity has led to the isolation of γ-aminobutyric acid, from the leaves of Artocarpus incisa L. and of Piper amalago L. and to the demonstration by paper chromatography of its presence in several extracts. Extracts showing pressor activity were also examined and tyramine has been isolated from Phoradendron wattii Kr. and Urb. and dopamine has been shown by paper chromatography to be present in Piper amalago L. and Stachytarpheta jamaicensis Vahl.
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