title: Feasibility of the determination of polycyclic aromatic hydrocarbons in edible oils via unfolded partial least-squares/residual bilinearization and parallel factor analysis of fluorescence excitation emission matrices.
abstract: The possibility of simultaneously determining seven concerned heavy polycyclic aromatic hydrocarbons (PAHs) of the US-EPA priority pollutant list, in extra virgin olive and sunflower oils was examined using unfolded partial least-squares with residual bilinearization (U-PLS/RBL) and parallel factor analysis (PARAFAC). Both of these methods were applied to fluorescence excitation emission matrices. The compounds studied were benzo[a]anthracene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, dibenz[a,h]anthracene, benzo[g,h,i]perylene and indeno[1,2,3-c,d]-pyrene. The analysis was performed using fluorescence spectroscopy after a microwave assisted liquid-liquid extraction and solid-phase extraction on silica. The U-PLS/RBL algorithm exhibited the best performance for resolving the heavy PAH mixture in the presence of both the highly complex oil matrix and other unpredicted PAHs of the US-EPA list. The obtained limit of detection for the proposed method ranged from 0.07 to 2 μg kg(-1). The predicted U-PLS/RBL concentrations were satisfactorily compared with those obtained using high-performance liquid chromatography with fluorescence detection. A simple analysis with a considerable reduction in time and solvent consumption in comparison with chromatography are the principal advantages of the proposed method.
authors.affiliation: Departamento de Química Inorgánica y Analítica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Casilla 233, Chile.
authors.forename: Francis
authors.initials: F
authors.lastname: Alarcón
authors.forename: María E
authors.initials: ME
authors.lastname: Báez
authors.forename: Manuel
authors.initials: M
authors.lastname: Bravo
authors.forename: Pablo
authors.initials: P
authors.lastname: Richter
authors.forename: Graciela M
authors.initials: GM
authors.lastname: Escandar
authors.forename: Alejandro C
authors.initials: AC
authors.lastname: Olivieri
authors.forename: Edwar
authors.initials: E
authors.lastname: Fuentes
mesh_terms: D002851:Chromatography, High Pressure Liquid; D005240:Feasibility Studies; D016018:Least-Squares Analysis; D059625:Liquid-Liquid Extraction; D008872:Microwaves; D000069463:Olive Oil; D010938:Plant Oils / Q000032:analysis*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D052616:Solid Phase Extraction; D013050:Spectrometry, Fluorescence; D000074242:Sunflower Oil
chemical_list: D000069463:Olive Oil; D010938:Plant Oils; D011084:Polycyclic Aromatic Hydrocarbons; D000074242:Sunflower Oil