Recebido em 25/7/05; aceito em 31/10/05; publicado na web em 18/4/06 ANTIMICROBIAL AND ALLELOPATHIC POTENTIAL OF THE AMIDES ISOLATED FROM THE ROOTS OF Ottonia martiana Miq., PIPERACEAE. Two amides, piperovatine and isopiperlonguminine, were isolated from the roots of Ottonia martiana Miq., a herbaceous shrub commonly used in folk medicine in the treatment of toothache. The crude extract (CE) and isolated compounds were submitted to bioautography and allelopathic assay. The bioautograms allowed the detection of compounds with antibacterial activity and the identification of the bioactive substance piperovatine. The CE and amides exhibited an allelopathic effect on Lactuca sativa (lettuce) seedling growth but did not affect the seeds' germinability.
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