Survey of pyrethroid, macrocyclic lactone and antibacterial residues in bulk milk tank from Minas Gerais State, Brazil1 Part of the L.C.A. Picinin Doctoral thesis in Food Science, Universidade Federal de Santa Catarina, Florianópolis, Brazil

Resíduos de piretróides, lactonas macrocíclicas e antimicrobianos em amostras de leite de tanque no estado de Minas Gerais

Lidia C.A. Picinin Isabela M. Toaldo Rodrigo B. Hoff Fernando N. Souza Mônica O. Leite Leorges M. Fonseca Soraia A. Diniz Marcos X. Silva Mônica M.O.P. Cerqueira Marilde T. Bordignon-Luiz About the authors

ABSTRACT:

A survey of veterinary drug residues in bulk milk tank from Minas Gerais State, Brazil, was carried out through a broad scope analysis. Here, 132 raw milk samples were collected at 45 dairy farms in Minas Gerais from August 2009 to February 2010, and analyzed for 42 analytes, comprising pyrethroids, macrocyclic lactones and antibacterials, using liquid chromatography coupled with mass spectrometry in tandem mode and gas chromatography with electron capture detection. Within all milk samples, at least one veterinary drug residue was identified in 40 milk samples (30.30%) by confirmatory tests, whereas 16 samples (12.12%) showed the presence of at least two residues. With regard to the Brazilian maximum residue levels, 11 milk samples (8.33%) were non-compliant according to Brazilian Legislation. The veterinary drugs detected in the non-compliant milk samples include penicillin V (one sample), abamectin (one sample) and cypermethrin (nine samples). Furthermore, the antibacterial screening methods failed to identify most of the positive samples that were detected by confirmatory tests, leading to a large discrepancy between the screening and confirmatory antimicrobial tests. Thus, the present study indicated that the veterinary drugs residues still represents a great concern for the milk production chain.

INDEX-TERMS:
Veterinary drug; pesticide; anthelmintic; antibiotic; raw milk.

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