RESUMEN
From the acetone extract of Teucrium tomentosum, a new antifeedant neo-clerodane diterpenoid teuctosin (1) was isolated along with teuflin (2), teucrin-H(2) (3), 6beta-hydroxyteuscordin (4), 6beta-acetylteuscordin (5) and montanin-D (6). The structure of the new compound was elucidated comprehensively using 1D and 2D NMR methods and confirmed by X-ray crystallography. All the compounds showed effective antifeedancy against Plutella xylostella and Spodoptera litura at 10 mug/cm(2) of leaf area.
Asunto(s)
Diterpenos de Tipo Clerodano , Diterpenos/química , Diterpenos/farmacología , Teucrium/química , Animales , Cristalografía por Rayos X , Diterpenos/aislamiento & purificación , Conducta Alimentaria/efectos de los fármacos , Insecticidas/química , Insecticidas/aislamiento & purificación , Insecticidas/farmacología , Estructura Molecular , Mariposas Nocturnas/efectos de los fármacos , Resonancia Magnética Nuclear Biomolecular , Extractos Vegetales/química , Spodoptera/efectos de los fármacosRESUMEN
Zaluzanin D, a sesquiterpene lactone has been isolated from the aerial parts of Vernonia arborea as a major constituent (0.04%). Antifungal activity of zaluzanin D has been studied against six plant-pathogenic fungi.
Asunto(s)
Antifúngicos/farmacología , Hongos Mitospóricos/efectos de los fármacos , Fitoterapia , Sesquiterpenos/farmacología , Vernonia , Antifúngicos/administración & dosificación , Antifúngicos/uso terapéutico , Relación Dosis-Respuesta a Droga , Humanos , Pruebas de Sensibilidad Microbiana , Extractos Vegetales/administración & dosificación , Extractos Vegetales/farmacología , Extractos Vegetales/uso terapéutico , Hojas de la Planta , Sesquiterpenos/administración & dosificación , Sesquiterpenos/uso terapéuticoRESUMEN
Four quassinoids, indaquassin C (1), samaderins C (2), B (3) and A (4), isolated from the seeds and bark of Samadera indica, were tested for insect antifeedant and growth regulatory activities against the tobacco cutworm, Spodoptera litura. Indaquassin C was the most effective antifeedant. Samaderin C increased pupal duration and induced pupal mortality.