title: Antioxidant activity of citrus cultivars and chemical composition of Citrus karna essential oil.
abstract: The genus Citrus has a number of species and hybrids that are well established for their pharmaceutical and economic importance. The essential oil from Citrus karna Raf (Rutaceae) was analyzed for D-limonene (92.31%), the major chemical constituent, along with other minor constituents such as alpha-pinene (1.23%) and beta-pinene (1.80%). It showed significant inhibition for the oxidation of linoleic acid in the beta-carotene-linoleic acid system. Essential oils A and B obtained from C. sinensis, with 35.08% and 76.68% d-limonene, respectively, were used to evaluate the effect of the d-limonene concentration on antioxidant potential. Studies showed that d-limonene and C. karna essential oil have a similar antioxidant potential (39.6 and 38.3%, respectively). C. sinensis oils A and B showed only 10.5% and 30% antioxidant potential, respectively, indicating the possible role of d-limonene in antioxidant activity.
authors.affiliation: National Botanical Research Institute, Lucknow, India. malhotra54@rediffmail.com
authors.forename: Swadesh
authors.initials: S
authors.lastname: Malhotra
authors.forename: Samiksha
authors.initials: S
authors.lastname: Suri
authors.forename: Rakesh
authors.initials: R
authors.lastname: Tuli
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification; D000081008:Bicyclic Monoterpenes; D001643:Bridged Bicyclo Compounds / Q000737:chemistry / Q000302:isolation & purification; D002957:Citrus / Q000737:chemistry*; D053138:Cyclohexenes / Q000737:chemistry / Q000302:isolation & purification; D008401:Gas Chromatography-Mass Spectrometry; D000077222:Limonene; D019787:Linoleic Acid / Q000737:chemistry; D039821:Monoterpenes / Q000737:chemistry / Q000302:isolation & purification; D009822:Oils, Volatile / Q000737:chemistry* / Q000302:isolation & purification; D010084:Oxidation-Reduction; D013729:Terpenes / Q000737:chemistry / Q000302:isolation & purification; D019207:beta Carotene / Q000737:chemistry
chemical_list: D000975:Antioxidants; D000081008:Bicyclic Monoterpenes; D001643:Bridged Bicyclo Compounds; D053138:Cyclohexenes; D039821:Monoterpenes; D009822:Oils, Volatile; D013729:Terpenes; D019207:beta Carotene; C010789:beta-pinene; D019787:Linoleic Acid; D000077222:Limonene; C005451:alpha-pinene