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Low-temperature clean-up method for the determination of pyrethroids in milk using gas chromatography with electron capture detection.
Goulart, Simone Machado; de Queiroz, Maria Eliana L R; Neves, Antônio Augusto; de Queiroz, José Humberto.
Afiliação
  • Goulart SM; Departamento de Química, Universidade Federal de Viçosa, Av. P. H. Rolfs, s/n, 36570-000 Viçosa-MG, Brazil.
Talanta ; 75(5): 1320-3, 2008 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-18585219
ABSTRACT
This paper describes a new gas-chromatography with electron capture detection (GC-ECD) method for determination of some pyrethroids in milk samples. The extraction of the pyrethroids was carried out by liquid-liquid extraction with clean-up by precipitation at low temperature, without additional stages for removal of fat interferences. The method was efficient with recoveries of 93.0+/-0.1% for cipermethrin and 84.0+/-0.3% for deltamethrin. The quantification limits were 0.75 microg L(-1) for both pyrethroids. The method was simple, of easy execution, and used only small quantities of organic solvent. After optimization and validation, the method was used for the determination of residues of the pyrethroids cipermethrin and deltamethrin in milk and in lactea drink commercialized in Viçosa (MG, Brazil). Some samples presented contamination with deltamethrin at levels below the maximum contamination limits established by the FAO.
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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Assunto principal: Piretrinas / Contaminação de Alimentos / Cromatografia Gasosa / Leite / Análise de Alimentos / Inseticidas Limite: Animais / Humanos País/Região como assunto: América do Sul / Brasil Idioma: Inglês Revista: Talanta Ano de publicação: 2008 Tipo de documento: Artigo País de afiliação: Brasil