title: Antioxidant and pro-oxidant properties of active rosemary constituents: carnosol and carnosic acid.
abstract: 1. Carnosol and carnosic acid have been suggested to account for over 90% of the antioxidant properties of rosemary extract. 2. Purified carnosol and carnosic acid are powerful inhibitors of lipid peroxidation in microsomal and liposomal systems, more effective than propyl gallate. 3. Carnosol and carnosic acid are good scavengers of peroxyl radicals (CCl3O2.) generated by pulse radiolysis, with calculated rate constants of 1-3 x 10(6) M-1 s-1 and 2.7 x 10(7) M-1 s-1 respectively. 4. Carnosic acid reacted with HOCl in such a way as to protect the protein alpha 1-antiproteinase against inactivation. 5. Both carnosol and carnosic acid stimulated DNA damage in the bleomycin assay but they scavenged hydroxyl radicals in the deoxyribose assay. The calculated rate constants for reaction with .OH in the deoxyribose system for carnosol and carnosic acid were 8.7 x 10(10) M-1 s-1 and 5.9 x 10(10) M-1 s-1 respectively. 6. Carnosic acid appears to scavenge H2O2, but it could also act as a substrate for the peroxidase system. 7. Carnosic acid and carnosol reduce cytochrome c but with a rate constant significantly lower than that of O2(-.).
authors.affiliation: Biochemistry Department, University of London, King's College, UK.
authors.forename: O I
authors.initials: OI
authors.lastname: Aruoma
authors.forename: B
authors.initials: B
authors.lastname: Halliwell
authors.forename: R
authors.initials: R
authors.lastname: Aeschbach
authors.forename: J
authors.initials: J
authors.lastname: Löligers
mesh_terms: D045784:Abietanes; D000975:Antioxidants / Q000378:metabolism*; D001761:Bleomycin / Q000494:pharmacology; D002336:Carnosine / Q000031:analogs & derivatives* / Q000378:metabolism; D004249:DNA Damage; D003855:Deoxyribose / Q000378:metabolism; D004224:Diterpenes; D016166:Free Radical Scavengers; D005609:Free Radicals; D006735:Horseradish Peroxidase / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000378:metabolism; D006997:Hypochlorous Acid / Q000378:metabolism; D015227:Lipid Peroxidation; D019684:Magnoliopsida; D016877:Oxidants / Q000378:metabolism*; D010616:Phenanthrenes / Q000378:metabolism* / Q000494:pharmacology; D010936:Plant Extracts / Q000378:metabolism*; D013481:Superoxides / Q000378:metabolism
chemical_list: D045784:Abietanes; D000975:Antioxidants; D004224:Diterpenes; D016166:Free Radical Scavengers; D005609:Free Radicals; D016877:Oxidants; D010616:Phenanthrenes; D010936:Plant Extracts; D001761:Bleomycin; D013481:Superoxides; C068623:carnosol; D003855:Deoxyribose; D006997:Hypochlorous Acid; D002336:Carnosine; D006861:Hydrogen Peroxide; D006735:Horseradish Peroxidase; C018381:salvin