title: Constituents of antibacterial extract of Caesalpinia paraguariensis Burk.
abstract: The Argentinean legume Caesalpinia paraguariensis Burk. (Fabaceae) was selected for further fractionation work based on the strong antimicrobial activity of its CH2Cl2-MeOH (1:1 v/v) extract against a host of clinically significant microorganisms, including antibiotic resistant strains. 1D and 2D NMR enabled the identification of the novel benzoxecin derivative caesalpinol along with the known compounds bilobetin, stigma-5-en-3-O-beta-6'-stearoylglucopyranoside, stigma-5-en-3-beta-6'-palmitoylglucopyranoside, stigma-5-en-3-beta-glucopyranoside, oleanolic acid, 3-O-(E)-hydroxycinnamoyl oleanolic acid, betulinic acid, 3-O-(E)-hydroxycinnamoyl betulinic acid, and lupeol from the active fractions. Oleanolic acid was found active against Bacillus subtilis and both methicillin-sensitive and -resistant Staphylococcus aureus with MICs of 8 (17.5 microM), 8 and 64 (140 microM) microg/ml, respectively. The rest of the compounds, however, did not show activity.
authors.affiliation: Department of Pharmacology and Toxicology, Division of Medicinal and Natural Products Chemistry, College of Pharmacy, University of Arizona, 1703 E. Mabel St., Tucson, AZ 85721-0207, USA.
authors.forename: Girma M
authors.initials: GM
authors.lastname: Woldemichael
authors.forename: Maya P
authors.initials: MP
authors.lastname: Singh
authors.forename: William M
authors.initials: WM
authors.lastname: Maiese
authors.forename: Barbara N
authors.initials: BN
authors.lastname: Timmermann
mesh_terms: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D001412:Bacillus subtilis / Q000187:drug effects; D001419:Bacteria / Q000187:drug effects*; D029911:Caesalpinia / Q000737:chemistry*; D002176:Candida albicans / Q000187:drug effects; D004926:Escherichia coli / Q000187:drug effects; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D016106:Methicillin Resistance; D008826:Microbial Sensitivity Tests; D010400:Penicillin G / Q000494:pharmacology; D053978:Pentacyclic Triterpenes; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D013211:Staphylococcus aureus / Q000145:classification / Q000187:drug effects; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D000094062:Betulinic Acid
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D005419:Flavonoids; D053978:Pentacyclic Triterpenes; D010936:Plant Extracts; D014315:Triterpenes; C402623:bilobetin; D010400:Penicillin G; D000094062:Betulinic Acid