title: Gas chromatographic determination of 29 organic acids in foodstuffs after continuous solid-phase extraction.
abstract: A simple and expeditious method based on continuous solid-phase extraction and gas chromatography-mass spectrometry (GC-MS) was reported for the direct determination of 29 organic acids in food and beverages. A sorbent column packed with 80 mg of LiChrolut EN-Supelclean ENVI-18 (1:1) was employed for extraction and clean-up purposes. After elution with 200 μL of methanol, the methanolic extract was directly injected into the GC-MS without prior derivatization. The method provided good linearity (0.5-1000 μg kg(-1)) and fairly good precision for all compounds (RSD lower than 6.2%). The recoveries of the organic acids from diluted samples that were spiked at three different concentrations (10, 40 and 100 μg kg(-1)) ranged from 93 to 98%. The applicability of the method was demonstrated by analyzing the target compounds in a wide variety of foodstuffs including beer, wine, fruit juice, soy sauce, soya milk and honey samples.
authors.affiliation: Department of Analytical Chemistry, Campus of Rabanales, University of Córdoba, E-14071 Córdoba, Spain.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Jurado-Sánchez
authors.forename: Evaristo
authors.initials: E
authors.lastname: Ballesteros
authors.forename: Mercedes
authors.initials: M
authors.lastname: Gallego
mesh_terms: D000143:Acids / Q000032:analysis*; D002849:Chromatography, Gas / Q000379:methods*; D015203:Reproducibility of Results; D052616:Solid Phase Extraction / Q000379:methods*
chemical_list: D000143:Acids