Abstract

CHAY RINCON, Javier et al. Polycyclic aromatic hydrocarbons (PAHs) in four milk brands sold in Mexico City: evaluating three fat extraction methods. Rev. mex. de cienc. pecuarias [online]. 2019, vol.10, n.4, pp.1064-1076.  Epub Apr 30, 2020. ISSN 2448-6698.  https://doi.org/10.22319/rmcp.v10i4.4763.

Polycyclic aromatic hydrocarbons (PAHs) are recognized as emerging pollutants in milk due to their risk to human health. Identification and quantification of PAHs requires analytical methods that allow more accurate and complete estimates. An analysis was done of the sixteen PAHs considered priority by the U.S. Environmental Protection Agency in whole milk from Mexico City, and this used to compare three milk fat extraction procedures. Of the four milk brands analyzed, three were ultrapasteurized (UHT) and one was pasteurized (HTST). The milk was acquired from March-June 2016. Three extraction methods were tested: saponification (method A); detergent solution extraction (method B); and liquid-liquid extraction (method C). The PAH profiles from each method were generated by gas chromatography with a flame ionization detector. Three of the four milk brands (75 %) were positive for at least one of the sixteen analyzed PAHs. Profiles differed by extraction method with only low molecular weight compounds in method A, both low and high molecular weight compounds in method B, and higher recovery rates of low and high molecular weight compounds in method C. This method produced better recovery rates for low (58.7-12.3) and high molecular weight PAHs (81.8-8.0) than in method B (low molecular weight = 15.0-8.0, high molecular weight = 58.0-21.0).

Keywords : Polycyclic aromatic hydrocarbons; Extraction methods; Milk; Gas chromatography.

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