title: Supercritical carbon dioxide extraction of essential oils from Perovskia atriplicifolia Benth.
abstract: The supercritical fluid extraction (SFE) of the aerial parts of Perovskia atriplicifolia Benth. was studied. The effect of different parameters such as pressure, temperature, modifier identity, and modifier volume on the SFE of the plant was investigated. The extracts were analyzed by GC and GC-MS and compared with the essential oil obtained from P. atriplicifolia Benth by steam distillation. The supercritical extracts and the steam-distilled products had very different compositions. The main constituents of the oil obtained by steam distillation were 1,8-cineole, limonene, camphor, beta-caryophyllene, alpha-pinene, camphene, and alpha-humulene. On the other hand, the major components of SFE extracts were 1,8-cineole, limonene, camphor, beta-caryophyllene, gamma-cadinene, alpha-pinene, and alpha-terpinyl acetate. The results showed that increasing the temperature from 35 to 65 degrees C (at a constant pressure of 100 atm) drastically reduced the number of extracted components. Also, the number of extracted constituents and the percent of main analytes increased when lower pressures were used. Using different modifiers (e.g., methanol, ethanol, dichloromethane, and hexane) for the extraction of the plant at low pressure (100 atm) and temperature (35 degrees C) showed that hexane was more selective than the other modifiers.
authors.affiliation: Material and Chemical Engineering Excellency Center, Malek Ashtar University of Technology, P.O. Box 16765-3454, Tehran, Iran. pourmortazavi@yahoo.com
authors.forename: Seied Mahdi
authors.initials: SM
authors.lastname: Pourmortazavi
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Sefidkon
authors.forename: Seied Ghorban
authors.initials: SG
authors.lastname: Hosseini
mesh_terms: D000081008:Bicyclic Monoterpenes; D002164:Camphor / Q000032:analysis; D002849:Chromatography, Gas; D025924:Chromatography, Supercritical Fluid; D003511:Cyclohexanols / Q000032:analysis; D053138:Cyclohexenes; D000077591:Eucalyptol; D008401:Gas Chromatography-Mass Spectrometry; D019686:Lamiaceae / Q000737:chemistry*; D000077222:Limonene; D039821:Monoterpenes / Q000032:analysis; D009822:Oils, Volatile / Q000302:isolation & purification*; D010936:Plant Extracts / Q000737:chemistry*; D013729:Terpenes / Q000032:analysis
chemical_list: D000081008:Bicyclic Monoterpenes; D003511:Cyclohexanols; D053138:Cyclohexenes; D039821:Monoterpenes; D009822:Oils, Volatile; D010936:Plant Extracts; D013729:Terpenes; D002164:Camphor; D000077222:Limonene; C005451:alpha-pinene; D000077591:Eucalyptol