title: Rapid analytical procedure for determination of mineral oils in edible oil by GC-FID.
abstract: A procedure for the determination of mineral oils in edible oil has been fully developed. The procedure consists of using a sulphuric acid-impregnated silica gel (SAISG) glass column to eliminate the fat matter. A chemical combustion of the fatty acids takes place, while the mineral oils are not affected by the sulphuric acid. The column is eluted with hexane using a vacuum pump and the final extract is concentrated and analysed by gas chromatography (GC) with flame ionisation detector (FID). The detection limit (LOD) and the quantification limit (LOQ) in hexane were 0.07 and 0.21 μg g(-1) respectively and the LOQ in vegetable oil was 1 μg g(-1). Only a few minutes were necessary for sample treatment to have a clean extract. The efficiency of the process, measured through the recoveries from spiked samples of edible oil was higher than 95%. The procedure has been applied to determine mineral oil in olive oil from the retailed market.
authors.affiliation: Aragón Institut of Engineering Research (I3A), Department of Analytical Chemistry, María de Luna St. 3, EINA - Campus Rio Ebro, University of Zaragoza, E-50018 Zaragoza, Spain. magdalenka.wrona@gmail.com
authors.forename: Magdalena
authors.initials: M
authors.lastname: Wrona
authors.forename: Davinson
authors.initials: D
authors.lastname: Pezo
authors.forename: Cristina
authors.initials: C
authors.lastname: Nerin
mesh_terms: D002849:Chromatography, Gas / Q000295:instrumentation / Q000379:methods*; D016002:Discriminant Analysis; D005506:Food Contamination / Q000032:analysis*; D057230:Limit of Detection; D008899:Mineral Oil / Q000032:analysis*; D000069463:Olive Oil; D010938:Plant Oils / Q000737:chemistry*
chemical_list: D000069463:Olive Oil; D010938:Plant Oils; D008899:Mineral Oil
keywords: Edible oil; GC–FID; Mineral oil; Sulphuric acid-impregnated silica gel sample treatment