Dionaea muscipula llamada “venus atrapamoscas”, es la única especie del género Dionaea perteneciente al grupo de las “plantas carnívoras” que además de su atractivo ornamental, hoy es estudiada para el aislamiento de metabolitos secundarios, habiéndose encontrado diversos compuestos con actividad directa en diferentes enfermedades. La plumbagina (2-metil5-hidroxi-1,4-naftoquinona) ha sido reportada en diferentes especies de géneros como Plumbago (Plumbaginaceae), Drosera y Dionaea (Droseraceae) y Diospyros (Ebenaceae) describiéndose actividades como antiespasmódica, antibacteriana, antifúngica antiparasitaria, antidolor reumático y anticancerígena. El objetivo del presente trabajo es desarrollar un método fiable por cromatografía HPLC UV para la determinación de plumbagina. El método presentó una la linealidad r 2 = 0.997569 para concentraciones entre 10 y 50 µg/ml, con límites de detección (LOD) y de cuantificación (LOQ) de 0.09 µg/ml y de 0,3 µg/ml, respectivamente. La precisión de los resultados fue expresada como un %RSD de 1,34 para el análisis intradiario y de 5,76 para el análisis interdiario. En la exactitud se obtuvo una recuperación máxima de plumbagina de 94,71 %. Se concluye que el método propuesto es simple, exacto y preciso y puede ser ensayado para la determinación rápida de plumbagina.
This study was conducted to determine whether the macroalgae Ulva papenfussi and Ulva nematoidea could be alternatives for preventing Litopenaeus vannamei vibriosis caused by the bacterium Vibrio parahaemolyticus. Phytochemical screening was performed on methanolic extracts to qualitatively determine the main groups of bioactive compounds, previous to an in vitro antibacterial test against V. parahaemolitycus. Phenols, polyphenols, flavonoids, and the high presence of carbohydrates were found in both macroalgae. U. papenfussi showed more presence of lipids and alkaloids than U. nematoidea . Macroalgae extracts prepared (v:v) with a 1:1 methanol: dichloromethane solvent was used for the in vitro test using the disc diffusion method (MDD). Filter paper discs impregnated with 1.0, 1.5, 2.0, 3.0, and 4.0 mg of the extracts showed antibacterial activity against V. Parahaemolitycus in a dose-dependent manner in both macroalgae. The inhibition zone varied significantly ( p < 0.05) from 8.33 ± 0.12 to 11.41 ± 0.73 mm for 1 to 3 mg of extract levels, respectively. In conclusion, both macroalgae have antibacterial activity in their crude extracts against this bacteria. It is suggested to evaluate it as a feed additive for L. vannamei. This study is the first report on a phytochemical screening and antibacterial activity of these macroalgae against V. parahaemolyticus.
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