title: Radical-scavenging activities of citrus essential oils and their components: detection using 1,1-diphenyl-2-picrylhydrazyl.
abstract: Thirty-four kinds of citrus essential oils and their components were investigated for radical-scavenging activities by the HPLC method using 1,1-diphenyl-2-picrylhydrazyl (DPPH). To examine the oils' relative radical-scavenging activities compared with that of a standard antioxidant, Trolox was employed. All of the essential oils were found to have scavenging effects on DPPH in the range of 17. 7-64.0%. The radical-scavenging activities of 31 kinds of citrus essential oils were comparable with or stronger than that of Trolox (p < 0.05). The oils of Ichang lemon (64.0%, 172.2 mg of Trolox equiv/mL), Tahiti lime (63.2%, 170.2 mg of Trolox equiv/mL), and Eureka lemon (61.8%, 166.2 mg of Trolox equiv/mL) were stronger radical scavengers than other citrus oils. Citrus volatile components such as geraniol (87.7%, 235.9 mg of Trolox equiv/mL), terpinolene (87.4%, 235.2 mg of Trolox equiv/mL), and gamma-terpinene (84.7%, 227.9 mg of Trolox equiv/mL) showed marked scavenging activities on DPPH (p < 0.05).
authors.affiliation: Department of Bioresources Science, Faculty of Agriculture, Kochi University, B-200 Monobe, Nankoku, Kochi 783-8502, Japan.
authors.forename: H S
authors.initials: HS
authors.lastname: Choi
authors.forename: H S
authors.initials: HS
authors.lastname: Song
authors.forename: H
authors.initials: H
authors.lastname: Ukeda
authors.forename: M
authors.initials: M
authors.lastname: Sawamura
mesh_terms: D015764:Bepridil / Q000031:analogs & derivatives* / Q000737:chemistry; D001713:Biphenyl Compounds; D002957:Citrus / Q000737:chemistry*; D016166:Free Radical Scavengers / Q000494:pharmacology*; D009822:Oils, Volatile / Q000494:pharmacology*; D010851:Picrates
chemical_list: D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D009822:Oils, Volatile; D010851:Picrates; D015764:Bepridil; C004931:1,1-diphenyl-2-picrylhydrazyl