Resumen

PARDIO SEDAS, Violeta Trinidad; LOPEZ HERNANDEZ, Karla María; FLORES PRIMO, Argel  y  USCANGA SERRANO, Roxana. Effect of pasteurization on the concentration of dichlorodiphenyltrichloroethane (DDT) and hexachlorocyclohexane (HCH) in bovine milk. Rev. mex. de cienc. pecuarias [online]. 2021, vol.12, n.2, pp.318-336.  Epub 15-Nov-2021. ISSN 2448-6698.  https://doi.org/10.22319/rmcp.v12i2.5483.

Dichlorodiphenyltrichloroethane (DDT) and hexachlorocyclohexane (HCH) are endocrine disruptors whose presence in milk entails a health risk. There is evidence that pasteurization decreases or increases the concentration of organochlorine pesticides in dairy products. The present research evaluated the effect of pasteurization at 63 °C 30 min-1 and 73 °C 15 sec-1 on the concentrations of DDT, HCH and their metabolites in bovine milk, in order to estimate the dietary exposure from human consumption of pasteurized milk. A completely randomized experimental design with two treatments was performed on 100 milk samples collected in Soledad de Doblado and Jamapa, Veracruz, Mexico. Pesticides were quantified by gas chromatography with an electron microcapture detector. Data were analyzed by single-factor analysis of variance (P<0.05), and means were compared with Tukey’s test (P<0.05). The dietary exposure to pesticides was assessed based on the estimated daily intake (EDI) and average daily dose (ADD) in three population groups. Pasteurization at 73 ºC reduced the concentrations of p,p'-DDE, p,p'-DDD, o,p'-DDT, p,p'-DDT and total DDT by 30.94, 44.51, 3.18, 81.23, and 42.82 %, respectively, as well as the concentrations of β-HCH, γ-HCH and total HCH (by 85.68, 18.88, and 99.31 %, respectively). The EDI of total DDT by children, adults, and elderly people was lowest for consumption of milk pasteurized at 73 °C, and that of γ-HCH, for milk pasteurized at 63 °C. The DDP of total DDT decreased with pasteurization at 73 °C. The dietary exposure to DDT and HCH was higher in children.

Palabras llave : DDT; HCH; Milk; Pasteurization; Dietary exposure; Children.