title: Antibacterial hydroperoxysterols from Xanthosoma robustum.
abstract: Three new hydroperoxysterols, 24-hydroperoxy-4 alpha, 14 alpha- dimethylcholesta-8,25-dien-3 beta-ol, 25-hydroperoxy-4 alpha, 14 alpha-dimethylcholesta-8,23-dien-3 beta-ol and 25-hydroperoxycycloart-23-en- 3 beta-ol, have been isolated from the aerial parts of Xanthosoma robustum, besides 24-hydroperoxycycloart-25-en-3 beta-ol, 4 alpha, 14 alpha-dimethylcholesta-8,24-dien-3 beta-ol and cycloartenol. Additionally, the two new diols, 4 alpha, 14 alpha-dimethylcholesta-8,25-dien-3 beta, 24-diol and 4 alpha, 14 alpha-dimethylcholesta-8,23-dien-3 beta, 25-diol were obtained from the first two hydroperoxysterols, respectively, by reduction with triphenylphosphine. The structures have been defined by chemical and spectroscopic studies. The four hydroperoxysterols exhibited antibacterial activities against Escherichia coli, Bacillus subtilis and Micrococcus luteus.
authors.affiliation: Department of Pharmacy, Swiss Federal Institute of Technology, Zurich, Switzerland.
authors.forename: T
authors.initials: T
authors.lastname: Kato
authors.forename: B
authors.initials: B
authors.lastname: Frei
authors.forename: M
authors.initials: M
authors.lastname: Heinrich
authors.forename: O
authors.initials: O
authors.lastname: Sticher
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D001412:Bacillus subtilis / Q000187:drug effects; D004926:Escherichia coli / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D016982:Micrococcus luteus / Q000187:drug effects; D010946:Plants, Medicinal / Q000737:chemistry*; D013261:Sterols / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D013261:Sterols