RESUMO:Eugenia malaccensis L. (Syzygium malaccensis Merr.& Perry), denominada comumente de jambo vermelho, é uma espécie arbórea de ocorrência comum no Brasil e faz parte das plantas medicinais do Estado de Alagoas. Estudos químicos anteriores com E. malaccensis foram realizados com plantas coletadas na Ásia, Oceania e na América Central. Este trabalho descreve o estudo químico do extrato etanólico das folhas e cascas de um espécimem coletado no Estado de Alagoas, Brasil. Considerando-se a escassa literatura sobre o potencial moluscicida e larvicida dessa espécie, buscou-se testar estas atividades contra caramujos Biomphalaria glabrata Say, e frente às larvas do mosquito Aedes aegypti L. Os extratos etanólicos da casca do caule e das folhas foram inativos frente às larvas de Aedes aegypti na concentração de 500 μg/mL, porém, ativos contra Biomphalaria glabrata (CL 50 = 42,53 e 41,90 μg/mL, respectivamente). O estudo químico levou ao isolamento e identifi cação de 5,7,3',4',5'-penta-hidroxi-fl avonol (1), 5,7,3',5'-tetra-hidroxi-4'-metoxi-fl avonol (2), ácido 3,4,5-tri-hidroxibenzóico (3) e ácido 3-acetil-urs-12-en-28-óico (4) das folhas e da casca do caule. O composto 4 é isolado pela primeira vez no gênero Eugenia. As estruturas desses compostos foram estabelecidas através de estudos no IV, de RMN 1 H e 13 C e comparação com dados da literatura. Considering that studies on the molluscicidal and larvicidal potential of E. malaccensis were not reported, this work aimed to test its molluscicidal activity against Biomphalaria glabrata snails and larvicidal activity against Aedes aegypti mosquitos. The ethanolic stem bark and leaf extracts were inactive towards Aedes aegypti larvae. The ethanolic stem bark and leaf extract were active against Biomphalaria glabrata with CL 50 = 42.53 and 41.90 μg/mL, respectively. 5,7,3',4',5'-Penta-hydroxy-fl avonol (1), 5,7,3',5'-tetra-hydroxy-4'-methoxyfl avonol (2), 3,4,5-tri-hydroxybenzoic acid (3) and 3-acetyl-urs-12-en-28-oic acid (4) were isolated and identifi ed from the leaves and stem bark. The acid 3β-O-acetyl-urs-12-en-28-oic is for the fi rst time isolated from the genus Eugenia. The structures of the compounds have been established by IR, 1 H and 13 C NMR spectral analysis and by comparison with literature data.
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