title: Comparison of QuEChERS sample preparation methods for the analysis of pesticide residues in canned and fresh peach.
abstract: 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.
authors.affiliation: Laboratório de Análises de Compostos Orgânicos e Metais, Escola de Química e Alimentos, Universidade Federal do Rio Grande, Av Itália, km 8, s/n, Rio Grande 96201-900, Rio Grande do Sul, Brazil.
authors.forename: Fabiane Pinho
authors.initials: FP
authors.lastname: Costa
authors.affiliation: Laboratório de Análises de Compostos Orgânicos e Metais, Escola de Química e Alimentos, Universidade Federal do Rio Grande, Av Itália, km 8, s/n, Rio Grande 96201-900, Rio Grande do Sul, Brazil.
authors.forename: Sergiane Souza
authors.initials: SS
authors.lastname: Caldas
authors.affiliation: Laboratório de Análises de Compostos Orgânicos e Metais, Escola de Química e Alimentos, Universidade Federal do Rio Grande, Av Itália, km 8, s/n, Rio Grande 96201-900, Rio Grande do Sul, Brazil. Electronic address: dqmednei@furg.br.
authors.forename: Ednei Gilberto
authors.initials: EG
authors.lastname: Primel
mesh_terms: D005506:Food Contamination / Q000032:analysis*; D005519:Food Preservation; D008401:Gas Chromatography-Mass Spectrometry; D010573:Pesticide Residues / Q000032:analysis*; D010575:Pesticides / Q000032:analysis; D027861:Prunus / Q000737:chemistry*; D015203:Reproducibility of Results
chemical_list: D010573:Pesticide Residues; D010575:Pesticides
keywords: Canned peach; GC–MS; Pesticide; QuEChERS