RESUMO
Mosquitoes are one of the main vectors of many important diseases and their degree of resistance to chemical insecticides has increased. Nowadays, it has become crucial to identify novel plant larvicides with an eco-friendly impact. The components of essential oils from Croton linearis Jacq. (EO-Cl), Lantana involucrata L. (EO-Li), Ocimum sanctum var. cubensis M. Gómez. (EO-Os), and Zanthoxylum pistaciifolium Griseb. (syn. Zanthoxylum flavum subsp. pistaciifolium (Griseb.) Reynel (EO-Zp) were determined using gas chromatography-mass spectrometry (GC-MS) analysis. Larvicidal and adulticidal bioassays against Aedes aegypti, Anopheles albitarsis and Culex quinquefasciatus, were performed according to the World Health Organization standard methods. A high diversity of compounds was identified in the four oils, with a total of 152 compounds (33-70 components). EO-Cl, EO-Li, and EO-Os were classified as active against both insect forms, larvae and adults. Lantana involucrata showed the best results, with LC50 values from 33.8 to 41.7 mg/L. In most of the cases, it was not possible to associate the main compounds with the measured activity, supporting the hypothesis about probable synergistic interactions among major and minor compounds. The results indicate EO-Cl, EO-Os, and EO-Li as good eco-friendly insecticides with potential.
RESUMO
Zanthoxylum pistaciifolium Griseb. is a tree endemic to Cuba, occasionally used in herbal medicine. Previously, the antitrypanosomal activity of a n-hexane-2-butanone extract of Z. pistaciifolium leaves and of its constituent skimmianine were published. In the current study a more thorough examination of the respective extract is performed, which led to the isolation and identification of three flavonoids, more specifically, the flavonol-3-O-methylethers kaempferol-3-O-methylether (1) and novel compounds kaempferol-3-O-methylether-5-O-ß-D-glucoside (2) and kaempferol-8-hydroxy-3,7-O-dimethylether-5-O-ß-D-glucoside (3). All compounds were screened for their antimicrobial and antiprotozoal activity and cytotoxicity towards MRC-5 SV2 cells. Compound 1 showed a moderate to weak activity against Trypanosoma cruzi (IC50 30.8 µM), T. brucei (IC50 15.4 µM) and Plasmodium falciparum (IC50 53.8 µM), but also showed cytotoxicity (CC50 19.0 µM). Compounds 2 and 3 did not display activity in any of the assays (IC50 and CC50 > 64 µM).[Formula: see text].
Assuntos
Rutaceae , Zanthoxylum , Glucosídeos , Quempferóis , Extratos Vegetais/farmacologiaRESUMO
The present study was aimed to archive the etnhnomedicinal knowledge of plants used by inhabitants of seven villages of HolguiÌn, Eastern region, Cuba. The ethnomedicinal information was collected through interviews. The collected data were analyzed through use value (UV), informant consensus factor (Fic) and fidelity level (FL). A total of 195 species of plants distributed in 166 genera belonging to 70 families were identified for the treatment of 17 ailment categories. The most treated conditions were digestive and liver disorders. The most important species according to their use value were Lippia alba (Mill.) N.E. Br. ex Britton & P. Wilson (0.236) and Annona muricata L. (0.194). Cancer and tumors had the Fic value of 0.94. A total of 19 species has a highest FL of 100 percent. This was the first ethnobotanical survey conducted in HolguiÌn region, which will contribute to preserve valuable information of medicinal plants that may otherwise be lost to future generations.
El presente estudio tuvo como objetivo registrar el conocimiento etnomedicinal de las plantas usadas por los pobladores en 7 comunidades de HolguiÌn, RegioÌn Oriental, Cuba. La informacioÌn fue recogida a traveÌs de entrevistas y analizada cuantitativamente mediante indicadores etnobotaÌnicos: valor de uso (UV), factor del consenso de los informantes (Fic) e iÌndice de fidelidad (FL). Fueron reportadas un total de 195 especies de plantas, distribuidas en 166 geÌneros y 70 familias, para el tratamiento de 17 categoriÌas de usos. Las indicaciones maÌs frecuentes fueron los problemas digestivos y del hiÌgado. Las especies medicinales con mayor UV fueron Lippia alba (Mill.) N.E. Br. ex Britton & P. Wilson (0.236) y Annona muricata L. (0.194). CaÌncer y tumores tuvieron el valor maÌs alto de Fic (0.94). Solo 19 especies presentaron un valor de FL de 100 %. Este primer estudio contribuiraÌ a preservar la informacioÌn de las plantas medicinales y que esta no se pierda en las futuras generaciones.
Assuntos
Humanos , Plantas Medicinais , Etnobotânica , Inquéritos e Questionários , CubaRESUMO
Se realizó la validación prospectiva del método desarrollado para la determinación cuantitativa del disofenol, un compuesto de actividad antihelmíntica reconocida, mediante una valoración potenciométrica de neutralización en un medio no acuoso. Teniendo en cuenta la clasificación del método, se evaluaron los parámetros: específicidad, linealidad, precisión y exactitud. Los resultados obtenidos demostraron que la técnica es fiable, pues permitió la determinación del compuesto estudiado en presencia de 4-nitrofenol (impureza de la síntesis); además el procesamiento estadístico de los resultados evidenció la linealidad, precisión y exactitud del método