This study aims to identify special metabolites in polar extracts from Urochloa humidicola (synonym Brachiaria humidicola) that have allelopathic effects and induce secondary photosensitization in ruminants. The compounds were isolated and identified via chromatographic and spectroscopic techniques. The compounds 4-hydroxy-3-methoxy-benzoic acid, trans-4-hydroxycinnamic acid, and p-hydroxy-benzoic acid; the flavonols isorhamnetin-3-O-β-d-glucopyranoside and methyl quercetin-3-O-β-d-glucuronate; and kaempferitrin, quercetin-3-O-α-l-rhamnopyranoside, and tricin were identified in the extract from the leaves of Urochloa humidicola. Two furostanic saponins, namely, dioscin and 3-O-α-l-rhamnopyranosyl-(1-4)-[α-l-rhamnopyranosyl-(1-2)]-β-d-glucopyranosyl-penogenin, as well as catechin-7-O-β-dglucopyranoside were identified in the methanolic extract obtained from the roots of this plant. This species features a range of metabolites that may be toxic for animals if used in food and may interfere with the growth medium, thereby inhibiting the development of other species.

Resumo A raiz de Lonchocarpus longifolius (Benth.) Ducke. sin. Derris longilofia Benth. (Leguminosae-Papilionoideae), dos arredores de Manaus, Amazonas, contém rotenona, 12a-hidroxirotenona e 6a, 12a-deshidrorotenona ao lado de deguelina e 12a-hidroxideguelina (tefrosina).

A five-year-old mongrel bitch was admitted for acute care presenting neurological symptoms such as ataxia, muscular stiffness on forelimbs, pronounced depression, lethargy, weakness, incoordination, mydriasis and bilateral decreased pupillary reflex. Twelve hours post-admittance, the patient vomited both crushed and intact seeds of Talisia esculenta. Literature reports cases of sheep and cattle poisoning with similar symptoms by ingestion of fruits and leaves of T. esculenta. The aim of this article is to report this case, since no such records in companion animals are available.