title: Superheated water extraction of essential oils of Origanum micranthum.
abstract: Superheated water extraction is used to extract essential oil of leaves of Origanum micranthum. The effect of different temperatures on the essential oil profile and rate of extraction as a function of time is investigated. The components of essential oil of Origanum micranthum are removed from the aqueous extract by C18 solid-phase extraction. The identification of components is carried out using comprehensive gas chromatography-time of flight-mass spectrometry. The number of extracted components is almost the same; however, the concentrations change with changing temperature. The highest yield (0.64%) is found at a temperature of 150 degrees C, 2 mL/min and 60 bar for 30 min. The increasing temperature from 100 degrees C to 175 degrees C increased the rate of extraction of six selected components of essential oil of Origanum micranthum. cis-Sabinenehydrate exhibits the fastest rate of extraction at all temperatures studied. Some degradation products are observed at a temperature of 175 degrees C.
authors.affiliation: The University of Gaziantep, Engineering Faculty, Food Engineering Department, 27310 Gaziantep, Turkey. fahret@gantep.edu.tr
authors.forename: Fahrettin
authors.initials: F
authors.lastname: Gogus
authors.forename: Mustafa Z
authors.initials: MZ
authors.lastname: Ozel
authors.forename: Alastair C
authors.initials: AC
authors.lastname: Lewis
mesh_terms: D005591:Chemical Fractionation / Q000379:methods; D006358:Hot Temperature; D031341:Origanum / Q000737:chemistry*; D010938:Plant Oils / Q000302:isolation & purification*; D052616:Solid Phase Extraction; D014867:Water
chemical_list: D010938:Plant Oils; D014867:Water