Multivariate optimization for extraction of pyrethroids in milk and validation for GC-ECD and CG-MS/MS analysis

• Published in: International journal of environmental research and public health Vol. 11; no. 11; pp. 11421 - 11437
• Main Authors: Meneghini, Leonardo Zanchetti, Rübensam, Gabriel, Bica, Vinicius Claudino, Ceccon, Amanda, Barreto, Fabiano, Ferrão, Marco Flores, Bergold, Ana Maria
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 05.11.2014; MDPI
• Subjects: Animals; Chromatography; Chromatography, Gas; Environmental Monitoring - methods; Environmental Pollutants - analysis; Gas Chromatography-Mass Spectrometry; Insecticides - analysis; Mass spectrometry; Milk; Milk - chemistry; Multivariate Analysis; Optimization; Pyrethrins - analysis; Pyrethrins - isolation & purification; Solvent extraction processes; Tandem Mass Spectrometry
• ISSN: 1660-4601; 1661-7827; 1660-4601
• DOI: 10.3390/ijerph111111421

A simple and inexpensive method based on solvent extraction followed by low temperature clean-up was applied for determination of seven pyrethroids residues in bovine raw milk using gas chromatography coupled to tandem mass spectrometry (GC-MS/MS) and gas chromatography with electron-capture detector (GC-ECD). Sample extraction procedure was established through the evaluation of seven different extraction protocols, evaluated in terms of analyte recovery and cleanup efficiency. Sample preparation optimization was based on Doehlert design using fifteen runs with three different variables. Response surface methodologies and polynomial analysis were used to define the best extraction conditions. Method validation was carried out based on SANCO guide parameters and assessed by multivariate analysis. Method performance was considered satisfactory since mean recoveries were between 87% and 101% for three distinct concentrations. Accuracy and precision were lower than ±20%, and led to no significant differences (p < 0.05) between results obtained by GC-ECD and GC-MS/MS techniques. The method has been applied to routine analysis for determination of pyrethroid residues in bovine raw milk in the Brazilian National Residue Control Plan since 2013, in which a total of 50 samples were analyzed.