Dietary uptake of dioxins (PCDD/PCDFs) and dioxin-like PCBs in Spanish aquacultured turbot (Psetta maxima)

Sonia Lucía Blanco (1) , Cristina Sobrado (1) , Corina Porro (1, 2) , Santiago Cabaleiro (3) , José Carlos González (1) , Juan Manuel Vieites (1)

1 Calidad y Seguridad Alimentaria
2 Quality and Food Safety Area
3 Centro Tecnológico de la Acuicultura de Galicia (CETGA)

Human population is exposed to dioxins (PCDD/Fs) and dioxin-like polychlorinated biphenyls (dl-PCBs) mainly through diet; bioaccumulation and biomagnification in aquatic environment results in fishery products and by-products being an important vector to humans. Determinations of PCDD/Fs and dl-PCBs in fillets of young turbots (Psetta maxima) (0 – 2 years) from aquaculture plant (Galicia, Spain) (N = 21) and in feeding stuffs were carried out, and dietary accumulation values and lipid-normalized biomagnification factors (BMF) relating concentration in fish and in feed were calculated. Levels found in feeding stuffs (0.5 pg TEQ-PCDD/F / g and 1.6 pg TEQ-dl-PCB / g), and turbots (0.13 - 0.27 pg TEQ-PCDD/F / g fresh weight and 0.35 - 1.2 pg TEQ-dl-PCB / g fresh weight) were below maximum permitted levels set by EC. Levels of toxic compounds in feeding stuff are reflected in fish fillets; predominant isomers are 2,3,7,8-TCDF, OCDD, 1,2,3,7,8-PeCDF, 2,3,4,7,8-PeCDF and 1,2,3,4,6,7,8-HpCDD, and PCBs 118, 105, 156 and 167. Relevant compounds accounting for total toxicity are the same congeners in feeding stuff and turbots: 2,3,4,7,8- PeCDF; 2,3,7,8-TCDF; 2,3,7,8-TCDD and 1,2,3,7,8-PeCDD, and PCB 126. Higher accumulation efficiency values were obtained for dl-PCBs (30 - 46%); tetra- and penta-chloro substituted PCDD/Fs showed the highest values (27 - 34%) of the PCDD/F group. Biomagnification was shown for these compounds (BMF around 1.5).

Mots clés: Life Sciences

Sonia Lucía Blanco, Cristina Sobrado, Corina Porro, Santiago Cabaleiro, José Carlos González, et al.. Dietary uptake of dioxins (PCDD/PCDFs) and dioxin-like PCBs in Spanish aquacultured turbot (Psetta maxima). Food Additives and Contaminants, 2007, 24 (04), pp.421-428. ⟨10.1080/02652030601064821⟩. ⟨hal-00577517⟩