RESUMO:Syzygium jambos (L.) Alston, Myrtaceae, é empregado na medicina popular como digestivo e antiinflamatório. A triagem fitoquímica da droga pulverizada (folhas) indicou a presença de flavonóides, taninos e óleo volátil. O extrato hidroetanólico a 70% das folhas de S. jambos foi preparado por percolação e liofilizado. O conteúdo de taninos das folhas e do extrato foi calculado, respectivamente, em 21,9% e 43,3%. O teor de flavonóides foi de 0,6% (folhas) e 1,2% (extrato). A administração oral prévia do extrato (400 mg/kg) a ratos Wistar reduziu significativamente as lesões gástricas induzidas por etanol acidificado. No modelo de úlcera subcrônica, com indução de lesão gástrica utilizando ácido acético a 30%, o tratamento com o extrato (400 mg/kg) não apresentou resultado significativo. A atividade antioxidante do extrato foi avaliada através dos modelos de lipoperoxidação e de medida de capacidade seqüestrante de radicais DPPH. Os valores obtidos de Q 1/2 (MDA) e CE 50 (DPPH) foram, respectivamente, 0,17 mg/mL e 5,68 mg/mL.Unitermos: Syzygium jambos, Myrtaceae, atividade antiúlcera, atividade antioxidante.ABSTRACT: "Antiulcerogenic and antioxidant activities of leaf extract of Syzygium jambos (L.) Alston (Myrtaceae)". Syzygium jambos (L.) Alston, Myrtaceae, is commonly employed in folk medicine as digestive and anti-inflammatory. Phytochemical screening of the powdered dried leaves indicates the presence of flavonoids, tannins and essential oil. Hydroethanol extracts (70%) were prepared by percolation and freeze-drying. The tannin content of dried leaves and extract was, respectively, 21.9% and 43.3%. The flavonoid content was 0.6% (dried leaves) and 1.2% (extract). Previous oral administration of S. jambos leaves extract (400 mg/kg) to rats reduced significantly gastric injury induced by HCl/ethanol. At the subcronic ulcer model by induction with 30% acetic acid the results were not significant. In vitro antioxidant activity of S. jambos extract was evaluated by malondialdehyde (MDA) and DPPH free radical method. The Q 1/2 for MDA assay was 0.17 mg/mL and the EC 50 for DPPH assay was 5.68 mg/mL.
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