DETERMINACIÓN DE PELIGROS QUÍMICOS EN QUESO COTIJA

Abstract

Was analyzed a total of 126 raw whole milk samples from two municipalities in the region of origin (and Cotija Quitupan). To determine the presence of residues of antimicrobial use the methodology proposed by the system microbiological agar diffusion using Bacillus subtilis ATCC 6633, with a spore concentration of 106 CFU / mL as the reference organism., Heavy metals digestion was performed acid using a reader for reading PCI samples and for residues of Clenbuterol was by the method of RIDASCREEN and reading was by ELISA. . Of the 126 Cotija chesse samples analyzed in the first stage 29 samples were positive representing (23.01%) while the remaining 97 (76.99%) were negative and of the 126 milk samples analyzed in the first stage 77 samples were positive representing (61.11%) while the remaining 49 (38.88%) were negative. Regarding heavy metals, concentrations superior both LMP trace elements such as metals considered toxic as As and Pb are listed in NOM-735-COFOCALEC with concentrations of 0.5 ppm to 0.1 ppm for As and Pb. The results of clenbuterol between 400 and 637 ppm in 4.57% milk, and the remainder (95.43%) did not detect residues of this chemical. The study reveals the presence of antimicrobial residues, heavy metals like Pb and Ar in raw milk that is produced with Cotija cheese, which shows that not respected clearance times established by the manufacturing laboratory