Two new stilbenes, 1 and 2, were isolated as leishmanicidal constituents from the methanolic extract of Lonchocarpus nicou leaves and stem, together with five known stilbenes and rotenoids. Their chemical structures were determined by spectral methods. Among them, the cis stilbene-type compounds 1 and 4 showed potent leishmanicidal activity (IC50: 5.5, 3.9 µg/mL), while the trans stilbene-type compounds 2 and 5, and rotenoids 6 and 7, showed moderate activities (IC50: 9.9, 12.8, 22.6, 19.6 µg/mL, respectively).
Nitidasin, a Novel Sesterterpenoid, from the Peruvian Folk Medicine "Hercampuri" (Gentianella nitida).-The title compound (I) is the first example of a sesterterpenoid with a new ring skeleton. The structure is elucidated by means of spectroscopic investigations and X-ray analysis. -(KAWAHARA, N.; NOZAWA, M.; FLORES, D.; BONILLA, P.; SEKITA, S.; SATAKE, M.; KAWAI, K.; Chem.
El estudio se realiza con el objeto de identificar el tipo de alcaloide, protoalcaloide opseudoalcaloide, que puedan ser cuantificables en las hojas y en la torta desemillas tostadas y desengrasadas de la especie Plukenetia volubilis L. y demostrar que su presencia no representa un riesgo para la salud. La metodología utilizada está basada en protometría de acuerdo a la Farmacopea Francesa y Europea, así como la utilización de técnicas de UHPLC-MS/MS y GC-MS que han permitido identificar y cuantificar un compuesto endógeno que revela las características de la cis-9-octadecenamida (oleamida), estructura similar a la anandamida; ligando endógeno de receptores cannabinoides en concentraciones de 0,0015% en hojas y 0,0004% en semillas. No habiendose detectado alcaloides que puedan afectar la seguridad alimentaria.
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