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DETERMINATION OF THE PRESENCE OF 10 ANTIMICROBIAL RESIDUES IN MEXICAN PASTEURIZED MILK

2005; Associação Interciencia; Volume: 30; Issue: 5 Linguagem: Inglês

0378-1844

Rey Gutiérrez Tolentino, Mario Noa Pérez, Gilberto Díaz González, Salvador Vega y León, Magdalena González López, Guadalupe Prado Flores,

Pharmaceutical and Antibiotic Environmental Impacts

SUMMARY Residues of 9 antimicrobial agents approved in Mexico for veterinary use in dairy cattle (sulfathiazole, sulfamerazine, sulfamethazine, sulfachloropyridazine, sulfamonomethoxine, sulfamethoxazole, nitrofurazone, furaltadone, and furazolidone) and non-approved chloramphenicol residues were studied every two weeks in four commercial brands of Mexican pasteurized milk (A, B, C and D) during one year (n=4×24=96). Drug residues were analyzed by high pressure liquid chromatography HPLC with UV detection. Percentage of positive samples to sulfonamide residues were 47.2% (Milk A), 58.3% (Milk B), 44.7% (Milk C) and 50% (Milk D). Sulfonamide residues ranged between 1.9 and 180µg/kg. sulfathiazole and sulfamerazine were the most common residues found. Only three samples (Milk B) exceeded maximum residue levels established for sulfonamides. Nitrofuran residues were not detected in any milk sample. Illegal Chloramphenicol residues were detected in one milk sample (Milk A) in levels of 27.2µg/kg.