title: Chemical composition and antioxidant properties of clove leaf essential oil.
abstract: The antioxidant activity of a commercial rectified clove leaf essential oil (Eugenia caryophyllus) and its main constituent eugenol was tested. This essential oil comprises in total 23 identified constituents, among them eugenol (76.8%), followed by beta-caryophyllene (17.4%), alpha-humulene (2.1%), and eugenyl acetate (1.2%) as the main components. The essential oil from clove demonstrated scavenging activity against the 2,2-diphenyl-1-picryl hydracyl (DPPH) radical at concentrations lower than the concentrations of eugenol, butylated hydroxytoluene (BHT), and butylated hydroxyanisole (BHA). This essential oil also showed a significant inhibitory effect against hydroxyl radicals and acted as an iron chelator. With respect to the lipid peroxidation, the inhibitory activity of clove oil determined using a linoleic acid emulsion system indicated a higher antioxidant activity than the standard BHT.
authors.affiliation: Department of Clinical Pharmacy and Diagnostics, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria. leopold.jirovetz@univie.ac.at
authors.forename: Leopold
authors.initials: L
authors.lastname: Jirovetz
authors.forename: Gerhard
authors.initials: G
authors.lastname: Buchbauer
authors.forename: Ivanka
authors.initials: I
authors.lastname: Stoilova
authors.forename: Albena
authors.initials: A
authors.lastname: Stoyanova
authors.forename: Albert
authors.initials: A
authors.lastname: Krastanov
authors.forename: Erich
authors.initials: E
authors.lastname: Schmidt
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D001713:Biphenyl Compounds; D002083:Butylated Hydroxyanisole; D002084:Butylated Hydroxytoluene; D005054:Eugenol / Q000032:analysis*; D016166:Free Radical Scavengers; D019787:Linoleic Acid / Q000737:chemistry; D000081222:Monocyclic Sesquiterpenes; D009822:Oils, Volatile / Q000737:chemistry* / Q000494:pharmacology*; D010851:Picrates; D018515:Plant Leaves / Q000737:chemistry*; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes / Q000032:analysis; D027842:Syzygium / Q000737:chemistry*; D017392:Thiobarbituric Acid Reactive Substances / Q000032:analysis
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D000081222:Monocyclic Sesquiterpenes; D009822:Oils, Volatile; D010851:Picrates; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes; D017392:Thiobarbituric Acid Reactive Substances; D002084:Butylated Hydroxytoluene; D002083:Butylated Hydroxyanisole; D005054:Eugenol; C042686:humulene; D019787:Linoleic Acid; C024714:caryophyllene; C004931:1,1-diphenyl-2-picrylhydrazyl