Chemical and pharmacological characterization of Erythrophleum lasianthum alkaloids

Article abstract of DOI:10.1055/s-2006-958071

Two alkaloids 1 and 2 were isolated from the seeds of Erythrophleum lasianthum. Their structures were assigned by spectroscopic and chemical means as 3β-hydroxynorerythrosuamine (1) and its 3-O-β-D-glucopyranoside (2). In spontaneously beating atria, both compounds 1 and 2 showed a marked and concentration-dependent positive inotropic activity and a weak negative chronotropic activity. The positive inotropic effect induced by 1 and 2 was not modified by propranolol, prazosin, carbachol, and ranitidine plus pyrilamine. Both 1 and 2 were very active in inhibiting the Na⁺/K⁺-ATPase isolated from bovine cardiac sarcolemmal vesicles.