title: Solid-phase microextraction gas chromatography-mass spectrometry determination of monoterpenes in honey.
abstract: Solid-phase microextraction (SPME) using a 100 microm poly(dimethylsiloxane) (PDMS) fiber, followed by gas chromatography (GC-MS) determination, has been applied to the analysis of some monoterpenoids in honey. The extraction was performed by direct immersion of the fiber using a sampling period of 15 min with constant magnetic stirring (1100 rpm) and an extraction temperature of 20 degrees C. A 7 mL sample volume of an aqueous solution of honey with 25% of NaCl was placed in 15 mL glass vial fitted with screw cap and PTFE/silicone septum. Desorption was performed directly in the gas chromatograph injector port during 5 min at 250 degrees C using the splitless mode. The method is sensitive with detection limits between 11 and 25 microg L(-1), precise with coefficients of variation in the range 1.28 and 3.71%, and linear over more than one order of magnitude. The related conditions were used for honey sample analyses with recoveries between 71.8 and 90.9%. SPME remains an attractive alternative technique due to its rapidity and because it is a solvent free extraction method.
authors.affiliation: Departamento Química Analítica, Nutrición y Bromatología, Facultad de Ciencias, Universidad Santiago Compostela, Avda Alfonso X El Sabio s/n, 27002 Lugo, Spain.
authors.forename: Rosa M
authors.initials: RM
authors.lastname: Peña
authors.forename: Julia
authors.initials: J
authors.lastname: Barciela
authors.forename: Carlos
authors.initials: C
authors.lastname: Herrero
authors.forename: Sagrario
authors.initials: S
authors.lastname: García-Martín
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry; D006722:Honey / Q000032:analysis*; D039821:Monoterpenes / Q000032:analysis* / Q000302:isolation & purification; D009994:Osmolar Concentration; D013997:Time Factors
chemical_list: D039821:Monoterpenes