Residue of insecticides in foodstuff and dietary exposure assessment of Brazilian citizens.

The goal of this work is to study the presence of 17 different pyrethroids and chlorpyrifos in animal origin food samples, including chicken, beef, fish, eggs and milk. The samples were analyzed by GC/NCI-MS/MS in order to determine their insecticide concentration levels, the relation between the amount of insecticides and the lipid content, as well as their isomeric composition. Bifenthrin, cypermethrin, cyhalothrin, permethrin, deltamethrin and chlorpyrifos have been detected in real samples. The highest levels find were verified for chlorpyrifos (45.7 μg L-1, 17.5 μg kg-1 ww) and cypermethrin (2.75 μg L-1, 14.7 μg kg-1 ww) in milk and beef, respectively. The estimate of daily intake showed that none of these insecticides exceeded the safety limits of the acceptable daily intake values. A strong correlation between the amount of pesticides and lipid content was found for beef, fish and chicken samples. Regarding the isomers, a predominance of cis isomers in samples contaminated with cypermethrin was verified.