title: Antioxidant activity of chemical components from sage (Salvia officinalis L.) and thyme (Thymus vulgaris L.) measured by the oil stability index method.
abstract: A new abietane diterpenoid, 12-O-methyl carnosol (2), was isolated from the leaves of sage (Salvia officinalis L.), together with 11 abietane diterpenoids, 3 apianane terpenoids, 1 anthraquinone, and 8 flavonoids. Antioxidant activity of these compounds along with 4 flavonoids isolated from thyme (Thymus vulgaris L.) was evaluated by the oil stability index method using a model substrate oil including methyl linoleate in silicone oil at 90 degrees C. Carnosol, rosmanol, epirosmanol, isorosmanol, galdosol, and carnosic acid exhibited remarkably strong activity, which was comparable to that of alpha-tocopherol. The activity of miltirone, atuntzensin A, luteolin, 7-O-methyl luteolin, and eupafolin was comparable to that of butylated hydroxytoluene. The activity of these compounds was mainly due to the presence of ortho-dihydroxy groups. The 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity of these compounds showed the similar result.
authors.affiliation: Division of Food and Health Science, Graduate School of Human Life Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi, Osaka 558-8585, Japan.
authors.forename: Kayoko
authors.initials: K
authors.lastname: Miura
authors.forename: Hiroe
authors.initials: H
authors.lastname: Kikuzaki
authors.forename: Nobuji
authors.initials: N
authors.lastname: Nakatani
mesh_terms: D000880:Anthraquinones / Q000032:analysis; D000975:Antioxidants / Q000032:analysis* / Q000494:pharmacology; D004224:Diterpenes / Q000032:analysis; D004355:Drug Stability; D005419:Flavonoids / Q000032:analysis; D016166:Free Radical Scavengers; D009821:Oils; D010936:Plant Extracts / Q000032:analysis / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry; D027543:Salvia officinalis / Q000737:chemistry*; D012828:Silicones; D013729:Terpenes / Q000032:analysis; D046930:Thymus Plant / Q000737:chemistry*
chemical_list: D000880:Anthraquinones; D000975:Antioxidants; D004224:Diterpenes; D005419:Flavonoids; D016166:Free Radical Scavengers; D009821:Oils; D010936:Plant Extracts; D012828:Silicones; D013729:Terpenes