Comparison of QuEChERS sample preparation methods for the analysis of pesticide residues in canned and fresh peach

• Published in: Food chemistry 2014-12, Vol.165, p.587-593
• Main Authors: COSTA, Fabiane Pinho, CALDAS, Sergiane Souza, PRIMEL, Ednei Gilberto
• Format: Article
• Language: English
• Subjects: Biological and medical sciences; Food Contamination - analysis; Food Preservation; Food toxicology; Gas Chromatography-Mass Spectrometry; Medical sciences; Pesticide Residues - analysis; Pesticides - analysis; Pesticides, fertilizers and other agrochemicals toxicology; Prunus - chemistry; Reproducibility of Results; Toxicology
• ISSN: 0308-8146; 1873-7072
• DOI: 10.1016/j.foodchem.2014.05.099

Original, citrate and acetate QuEChERS methods were studied in order to evaluate the extraction efficiency and the matrix effect in the extraction of pesticides from canned peach samples. Determinations were performed by gas chromatography coupled to mass spectrometry (GC-MS). The proposed method with extraction using the original QuEChERS method and determination by GC-MS was validated. LOQs ranged between 1 and 10 μg kg(-1) and all analytical curves showed r values higher than 0.99. Recovery values varied from 69% to 125% with RSDs less than 20%. The matrix effect was evaluated and most compounds showed signal enrichment. Robustness was demonstrated using fresh peaches, which provided recovery values within acceptable limits. The applicability of the method was verified and residues of tebuconazole and dimethoate were found in the samples.