Offline Solid-Phase Extraction and Separation of Mineral Oil Saturated Hydrocarbons and Mineral Oil Aromatic Hydrocarbons in Edible Oils, and Analysis via GC with a Flame Ionization Detector
José Luis Hidalgo Ruiz,
Javier Arrebola Liébanas,
José Luis Martínez Vidal,
Antonia Garrido Frenich,
Roberto Romero González
Affiliations
José Luis Hidalgo Ruiz
Center for Research in Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), Department of Chemistry and Physics, Analytical Chemistry Area, Agrifood Campus of International Excellence ceiA3, University of Almería, Carretera de Sacramento s/n, E-04120 Almería, Spain
Javier Arrebola Liébanas
Center for Research in Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), Department of Chemistry and Physics, Analytical Chemistry Area, Agrifood Campus of International Excellence ceiA3, University of Almería, Carretera de Sacramento s/n, E-04120 Almería, Spain
José Luis Martínez Vidal
Center for Research in Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), Department of Chemistry and Physics, Analytical Chemistry Area, Agrifood Campus of International Excellence ceiA3, University of Almería, Carretera de Sacramento s/n, E-04120 Almería, Spain
Antonia Garrido Frenich
Center for Research in Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), Department of Chemistry and Physics, Analytical Chemistry Area, Agrifood Campus of International Excellence ceiA3, University of Almería, Carretera de Sacramento s/n, E-04120 Almería, Spain
Roberto Romero González
Center for Research in Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), Department of Chemistry and Physics, Analytical Chemistry Area, Agrifood Campus of International Excellence ceiA3, University of Almería, Carretera de Sacramento s/n, E-04120 Almería, Spain
A method was developed for the determination of mineral oil saturated hydrocarbons (MOSH) and mineral oil aromatic hydrocarbons (MOAH) in edible oils, achieving similar limits of quantification than those obtained by online extraction methodologies, i.e., 0.5 mg/kg. The isolation of MOSH and MOAH was performed in a silver nitrated silica gel stationary phase prior to their analysis by gas chromatography–flame ionization detector (GC-FID). To improve the sensitivity, the simulated on-column injection method, using a suitable liner, was optimized. The method was validated at 0.5, 10.0 and 17.9 mg/kg, and recoveries ranged from 80 to 110%. Intra and inter-day precision were evaluated at the same levels, and relative standard deviation (RSD) was lower than 20%. The method was applied to a total of 27 samples of different types of oil previously analyzed in an accredited laboratory, detecting MOSH up to 79.2 mg/kg and MOAH up to 22.4 mg/kg.
