title: The essential oil of Senecio graveolens (Compositae): chemical composition and antimicrobial activity tests.
abstract: The chemical composition of the essential oil obtained from Senecio graveolens (Compositae) was analyzed by GLC-MS and the components identified were: isovaleraldehyde, alpha-pinene, alpha-phellandrene, alpha-terpinene, p-cymene, sabinene, gamma-terpinene, 1-methyl-4-isopropenylbenzene, terpinolene, terpinen-4-ol, piperitenone, alpha- and beta-eudesmol. The investigation by the agar-well diffusion method of the antimicrobial activity of the essential oil proved that it has antibacterial effects on Micrococcus luteus ATCC 9341, oxacillin-sensitive and oxacillin-resistant Staphylococcus aureus, as well as antifungal effects on clinically isolated Candida albicans. The minimal inhibitory concentration (MIC) values for M. luteus, oxacillin-sensitive S. aureus and C. albicans were 8.73, 10.91 and 2.13 x 10(-2) mg/ml, respectively. The antimicrobial activity related to known antibiotics was calculated. These results would be compatible with a potential concentration-dependent selectivity of antifungal effect of S. graveolens essential oil. Minimal bactericidal concentration (MBC) is above 87.3 mg/ml. Thus the MBC:MIC ratio would be clearly higher than 1 (above 8), indicating a bacteriostatic effect of the essential oil.
authors.affiliation: Cátedra de Farmacología, Facultad de Odontología, Universidad de Buenos Aires, Argentina.
authors.forename: C
authors.initials: C
authors.lastname: Pérez
authors.forename: A M
authors.initials: AM
authors.lastname: Agnese
authors.forename: J L
authors.initials: JL
authors.lastname: Cabrera
mesh_terms: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents / Q000494:pharmacology*; D019659:Asteraceae / Q000737:chemistry*; D002176:Candida albicans / Q000187:drug effects; D008401:Gas Chromatography-Mass Spectrometry; D008826:Microbial Sensitivity Tests; D016982:Micrococcus luteus / Q000187:drug effects; D009822:Oils, Volatile / Q000737:chemistry* / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D009822:Oils, Volatile