The
nature of organochlorine pesticides (OCP) and their physical-chemical
properties exert immediate action of control on live systems, which has
justified their use in agricultural practices. Their long life makes them a
persistent ecological aggressor and biomagnifier. They reach foods by biotic
and abiotic means, and are absorbed and accumulate in adipose tissue. In
lactation processes, they are excreted in milk through the mobilization of
fats. Diverse studies have identified them as neurotoxic, affecting
reproductive processes, altering the immunological response and act as
endocrine disruptors. An analysis was made of the content of organochlorine
pesticides in twenty-one samples of infant milk formulas marketed in the south
of Mexico City in 2010. The determinations were made following the protocols of
the International Dairy Federation, by means of gas chromatography with
electron capture detector, and the majority presence was found of α-HCH (100%), β-HCH
(95.2%), γ-HCH (90.5%), aldrin (85.7%),
heptachlor (80.9%) and heptachlor epoxide (80.9%) with mean values of
0.24, 0.13, 0.32, 0.62, 0.92 and 0.18 μg/kg of fat, respectively;all below the limits permitted by the Codex
Alimentarius. With null or lower recurrence and in lowerquantities, the
family of DDT, endrin, endrin aldehyde and the endosulphanes were quantified.