title: Phenolic and triterpenoid antioxidants from Origanum majorana L. herb and extracts obtained with different solvents.
abstract: Antioxidant properties of marjoram (Origanum majorana L.) herb and extracts obtained with ethanol, n-hexane, and supercritical CO2 extraction are presented. Individual antioxidants, ursolic acid, carnosic acid, and carnosol, were quantified with high-performance liquid chromatography. The effects of different parameters (temperature and pressure) of high-pressure extraction on the yield of carnosol were studied. Furthermore, two marjoram herbs from Hungary and Egypt were compared measuring hydrogen-donating abilities with 1,1-diphenyl-2-picrylhydrazyl by spectrophotometric and the total scavenger capacities by chemiluminometric methods from the aqueous extracts of the herbs. The antioxidant activities of the solvent extracts were performed using the Rancimat method. The Egyptian herb and its extracts possessed better antioxidant activities than Hungarian ones. Applying supercritical CO2 extraction, the highest value of carnosol was obtained at 400 bar and 60 degrees C.
authors.affiliation: Department of Chemical Engineering, Budapest University of Technology and Economics, Müegyetem rkp. 3, H-1521 Budapest, Hungary. erikavagi@yahoo.co.uk
authors.forename: E
authors.initials: E
authors.lastname: Vági
authors.forename: E
authors.initials: E
authors.lastname: Rapavi
authors.forename: M
authors.initials: M
authors.lastname: Hadolin
authors.forename: K
authors.initials: K
authors.lastname: Vásárhelyiné Perédi
authors.forename: A
authors.initials: A
authors.lastname: Balázs
authors.forename: A
authors.initials: A
authors.lastname: Blázovics
authors.forename: B
authors.initials: B
authors.lastname: Simándi
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D025924:Chromatography, Supercritical Fluid; D004534:Egypt; D006814:Hungary; D031341:Origanum / Q000737:chemistry*; D010636:Phenols / Q000032:analysis*; D010936:Plant Extracts / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry*; D012997:Solvents; D014315:Triterpenes / Q000032:analysis*
chemical_list: D000975:Antioxidants; D010636:Phenols; D010936:Plant Extracts; D012997:Solvents; D014315:Triterpenes