title: Constituents of leaves and flowers essential oils of Helichrysum pallasii (Spreng.) Ledeb. growing wild in Lebanon.
abstract: The chemical compositions of the essential oils obtained from leaves and flowers of Helichrysum pallasii were analyzed by gas chromatography and gas chromatography-mass spectrometry. Among the 102 identified constituents, hexadecanoic acid (16.2%), (Z,Z)-9,12-octadecadienoic acid (6.8%), tetradecanoic acid (2.6%), and (Z)-caryophyllene (4.2%) were the main constituent of the oil from leaves, while in the oil from flowers hexadecanoic acid (14.7%), (Z,Z)-9,12-octadecadienoic acid (14.2%), (Z)-caryophyllene (3.6%), and delta-cadinene (3.1%) predominated. The oils were both characterized by sesquiterpenes (33.4% for leaves and 33.7% for flowers, respectively) and fatty acids and esters (30.3% in leaves and 35% in flowers, respectively). The in vitro activity of the essential oils of the plant against some microorganisms in comparison with chloramphenicol by the broth dilution method was determined. The oils exhibited a weak activity as inhibitors of growth of Staphylococcus epidermidis in vitro (minimum inhibitory concentration = 100 microg/mL).
authors.affiliation: Dipartimento di Chimica delle Sostanze Naturali, Università degli Studi di Napoli Federico II, Napoli, Italy.
authors.forename: Carmen
authors.initials: C
authors.lastname: Formisano
authors.forename: Enrico
authors.initials: E
authors.lastname: Mignola
authors.forename: Daniela
authors.initials: D
authors.lastname: Rigano
authors.forename: Felice
authors.initials: F
authors.lastname: Senatore
authors.forename: Nelly Apostolides
authors.initials: NA
authors.lastname: Arnold
authors.forename: Maurizio
authors.initials: M
authors.lastname: Bruno
authors.forename: Sergio
authors.initials: S
authors.lastname: Rosselli
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000032:analysis; D001419:Bacteria / Q000187:drug effects; D004952:Esters / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis; D005231:Fatty Acids, Unsaturated / Q000032:analysis; D035264:Flowers; D036562:Helichrysum / Q000737:chemistry*; D007861:Lebanon; D019814:Myristic Acid / Q000032:analysis; D009822:Oils, Volatile / Q000737:chemistry* / Q000494:pharmacology*; D019308:Palmitic Acid / Q000032:analysis; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D018515:Plant Leaves; D010938:Plant Oils / Q000737:chemistry* / Q000494:pharmacology; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes / Q000032:analysis; D013212:Staphylococcus epidermidis / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D000894:Anti-Inflammatory Agents, Non-Steroidal; D004952:Esters; D005227:Fatty Acids; D005231:Fatty Acids, Unsaturated; D009822:Oils, Volatile; D010936:Plant Extracts; D010938:Plant Oils; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes; D019814:Myristic Acid; C027369:octadecadienoic acid; D019308:Palmitic Acid; C024714:caryophyllene