Dietary Milk Consumption and the Pesticide Residues Exposure from Pasteurized and UHT samples

The multi residue analysis with QuEChERS sample preparation method was employed to evaluate cow milk samples containing up to 3% of fat. After the cleanup step with C18, the pesticides were analyzed by Agilent 7890A GC and 7000B Triple Quadrupole GC/MS/MS System. Two analytical methods were established, for screening andfor quantification. The quantitativemethod was validated in terms of recovery and reproducibility.A total of 28 samples of milk (pasteurized and UHT) purchased at Sao Paulo markets were evaluatedby these two methods. The pesticides chlorpyrifos and cypermethrin were the most frequent, probably due to their use intick controlin bovines. All the positive sample results were below the LOQ and the acute dietary intake parameter was not extrapolated. The method was feasible for the propose of monitoring the food quality in which content of fat at 3% can compromise the chromatography system if the cleanup is not enough.