title: Antimicrobially active alkaloids from Tabernaemontana chippii.
abstract: From Tabernaemontana chippii root bark, forty-five alkaloids were isolated; thirty-four were fully characterized by means of their spectral data and/or co-tlc; eight alkaloids were new, four of them being 3-hydroxy derivatives of known dimeric voacamine type alkaloids. Most of the twenty-six known alkaloids belonged to the corynanthean, ibogan, or bisindole classes. The structures of eleven other alkaloids--all minor--were only partially elucidated, most of them being new alkaloids. All the dimeric alkaloids were shown to possess strong antimicrobial activity against gram-positive bacteria and moderate to weak activity against gram-negative bacteria.
mesh_terms: D000470:Alkaloids / Q000032:analysis / Q000494:pharmacology*; D000935:Antifungal Agents / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects*; D055598:Chemical Phenomena; D002621:Chemistry; D002855:Chromatography, Thin Layer; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D010946:Plants, Medicinal / Q000032:analysis*; D015003:Yeasts / Q000187:drug effects
chemical_list: D000470:Alkaloids; D000935:Antifungal Agents