Autor a quien debe ser dirigida la correspondencia: ResumenSe evalúo el contenido de compuestos polifenólicos tales como fenoles totales, flavonoides totales, taninos condensados y ácidos fenólicos, del fruto de la guayaba agria (Psidium araca). Estos compuestos determinan la capacidad antioxidante, propiedad que expresa la facilidad para atrapar especies reactivas de oxigeno como valor nutracéutico de la especie. La actividad antioxidante se determinó por diferentes metodologías tales como DPPH, ABTS, FRAP y ORAC. Los resultados son comparables con los de la guayaba común (Psidium guajava) y superiores a los reportados para frutas comunes como piña, sandía, maracuyá y melón. En conclusión, la guayaba agria es una fruta con un potencial antioxidante que puede ser manejado por diversas metodologías tecnológicas y obtener productos con alto valor agregado. Palabras clave: guayaba agria, actividad antioxidante, fenoles, poder nutracéutico AbstractThe content of polyphenol compounds such as total phenols, total flavonoids, condensed tannins and phenolic acids of the sour guava fruits (Psidium araca) was determined. These compounds determine the antioxidant capacity, property that expresses the facility for scavenging reactive oxygen species as nutraceutical value of the specie. The antioxidant activity of sour guava was determined by different methods such as DPPH, ABTS, FRAP and ORAC. The results are comparable with those found for common guava (Psidium guajava) and higher than those reported for common fruits such as pineapple, watermelon, passion fruit and melon. In conclusion, sour guava is a fruit with antioxidant potential, which can be handled by various technological methods to get high added-value products.

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A new triterpenoid (1) derived from 24-methylcycloartanol was isolated from the leaves of Oxandra cf. xylopioides. An unusual structure of the new compound was assigned as 1, for which the name berenjenol is proposed, on the basis of the spectroscopic data of the natural product and of its derivatives 2 and 3. The leaves also afforded the known monoterpene isoespintanol (4). Compounds 1 and 4 significantly reduced the paw edema induced by carrageenan by 64% and 43%, at 3 h, respectively. Moreover, 4 reduced IL-1 beta production by 72% at 100 microM and reduced IL-1 beta mRNA synthesis.