Comparison of Different Sorbents in the QuEChERS Method for the Determination of Pesticide Residues in Strawberries by LC-MS/MS

Autor(es)

Oshita, Daniele ^[1] ; Jardim, Isabel C. S. F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Chromatographia; v. 77, n. 19-20, p. 1291-1298, OCT 2014.
• Citações Web of Science: 14

Resumo

A comparison of sample preparation based on the quick, easy, cheap, effective, rugged and safe (QuEChERS) method for analysis of pesticide residues in strawberries by LC-MS/MS was made using different sorbents in the clean-up by dispersive solid-phase extraction (d-SPE). Some sorbents were laboratory-made, prepared by depositing poly(methyloctadecylsiloxane) (PMODS), poly(methyloctylsiloxane) (PMOS), aminopropyl-terminated poly(dimethylsiloxane) (APPS) and copolymer of (52-48 %)dimethyl-(48-52 %)methylphenyl-siloxane (DMMPS) onto silica supports. The commercial sorbent primary-secondary amine (PSA) and mixtures of two sorbents, primary-secondary amine and poly(methyloctadecylsiloxane), were also used in the experiments. The performances of the sorbents were evaluated by parameters such as color of the final extract, gravimetric measurement, recovery and matrix effect at the fortification level of 100 ng g(-1) of the pesticide mixture in strawberries. The recoveries were in the range 70-120 %, and the RSD values were lower than 20 % for most of the pesticides using the modified QuEChERS method with different sorbents in the clean-up step. The strawberry extracts were cleaned more efficiently with the use of primary-secondary amine sorbent, which has the function of removing sugars, organic acids and especially pigments. The sample preparation method was efficient, and LC-MS/MS determination was optimal because of high selectivity and good detectivity for the multiresidue analyses. (AU)

• Processo FAPESP: 06/57897-9 - Preparação, caracterização e aplicação de novas fases estacionárias para cromatografia líquida de alta eficiência e eletrocromatografia
• Beneficiário: Carol Hollingworth Collins
• Linha de fomento: Auxílio à Pesquisa - Temático