Levels and congeners distribution of dioxins, furans and dioxin-like PCBs in buffaloes adipose tissues sampled in vivo and milk

espanolEn este estudio se analizaron los niveles de PCDD, PCDF y DL-PCB en leche y en tejido adiposo de bufalos lactantes muestreado in vivo y en periodo de secado, asi como de vaquillas de una granja de Campania, confiscada por la autoridad competente debido a los altos niveles de dioxina encontrados en la leche a granel. A traves de HRGC-HRMS, utilizando el metodo 1613b de la epa (Agencia para la Proteccion del Medioambiente) de Estados Unidos, se realizo la determinacion quimica. El rango de valores establecido por el WHO-TEQ (equivalente toxico de la Organizacion Mundial de la Salud) para PCDD y PCDF en tejidos adiposos se situa entre 1.79 y 68.64 pg g−1 grasa, ubicandose entre 8.33 y 13.95 pg g−1 grasa en la leche. El perfil de contaminacion para dioxinas y furanos se establecio en 1,2,3,7,8-PeCDD; 2,3,4,7,8-PeCDF; 1,2,3,6,7,8-HxCDD y 2,3,7,8-TCDD. Los niveles de DL-PCB en los tejidos adiposos oscilaron entre 1.38 y 20.13 pg g−1 grasa, mientras que en la leche variaron entre 8.33 y 13.95 pg g−1 grasa. Los congeneres PCB 126 y PCB 169 dominaron el patron de DL-PCB en las dos matrices. EnglishThe levels of PCDDs, PCDFs and DL-PCBs were analyzed both in milk and adipose tissues sampled “in vivo” from lactating, drying off and heifer buffaloes from a Campania farm which had been impounded by the competent authority owing to the high dioxin levels found in bulk milk. The chemical determination was carried out by HRGC-HRMS using US EPA Method 1613b. The range of WHO-TEQ values for the PCDDs/PCDFs in adipose tissues was 1.79 to 68.64 pg g−1 fat and in milk was 8.33 to 13.95 pg g−1 fat. The contamination profile for dioxins and furans was given by 1,2,3,7,8-PeCDD; 2,3,4,7,8-PeCDF; 1,2,3,6,7,8-HxCDD and 2,3,7,8-TCDD. The levels of DL-PCBs in adipose tissue varied from 1.38 to 20.13 pg g−1 fat while ranged from 8.33 to 13.95 pg g−1 fat in milk. The pattern of DL-PCBs in both matrices was dominated by congeners PCB 126 and PCB 169.