title: Antifungal steroid saponins from Dioscorea cayenensis.
abstract: From the rhizomes of Dioscorea cayenensis Lam.-Holl (Dioscoreaceae), the new 26- O- beta- D-glucopyranosyl-22-methoxy-3 beta,26-dihydroxy-25( R)-furost-5-en-3- O- alpha- L-rhamnopyranosyl-(1-->4)- alpha- L-rhamnopyranosyl-(1-->4)-[ alpha- L-rhamnopyranosyl-(1-->2)]- beta- D-glucopyranoside ( 1) was isolated together with the known dioscin ( 2) and diosgenin 3- O- alpha- L-rhamnopyranosyl-(1-->4)- alpha- L-rhamnopyranosyl-(1-->4)-[ alpha- L-rhamnopyranosyl-(1-->2)]- beta- D-glucopyranoside ( 3). Their structures were established on the basis of spectral data. Compound 2 exhibited antifungal activity against the human pathogenic yeasts Candida albicans, C. glabrata and C. tropicalis (MICs of 12.5, 12.5 and 25 micro g/mL, respectively) whereas 3 showed weak activity and 1 was inactive.
authors.affiliation: Laboratoire de Pharmacognosie, Unité UMIB, EA 3660, Faculté de Pharmacie, Université de Bourgogne, 21079 Dijon, France.
authors.forename: M
authors.initials: M
authors.lastname: Sautour
authors.forename: A-C
authors.initials: AC
authors.lastname: Mitaine-Offer
authors.forename: T
authors.initials: T
authors.lastname: Miyamoto
authors.forename: A
authors.initials: A
authors.lastname: Dongmo
authors.forename: M-A
authors.initials: MA
authors.lastname: Lacaille-Dubois
mesh_terms: D000935:Antifungal Agents / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D002175:Candida / Q000187:drug effects*; D027742:Dioscorea; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008826:Microbial Sensitivity Tests; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D018517:Plant Roots; D013256:Steroids / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use
chemical_list: D000935:Antifungal Agents; D010936:Plant Extracts; D013256:Steroids