Optimisation of a solid-phase microextraction/HPLC/Diode Array method for multiple pesticide screening in lettuce

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Armindo Melo (Autor) Outra; Ana Aguiar (Autor) FCUP; Catarina Mansilha (Autor) Outra; Olivia Pinho (Autor) FCNAUP; Isabel M P L V O Ferreira (Autor) FFUP

Revista

Título: Food Chemistry

Vol. 130 Nº 4

Páginas: 1090-1097

ISSN: 0308-8146

Editora: Elsevier

Indexação

ISI Web of Knowledge - 47 Citações

ISI Web of Science

Scopus - 52 Citações

Classificação Científica

FOS: Ciências agrárias > Outras ciências agrárias

CORDIS: Ciências da Saúde

Outras Informações

ID Authenticus: P-002-D1Y

DOI: 10.1016/j.foodchem.2011.07.137

Abstract (EN): A new method was developed for the determination of 10 pesticides widely used in lettuce production (acetamiprid, azoxystrobin, cyprodinil, fenhexamid, fludioxonil, folpet, iprodione, metalaxyl, pirimicarb, and tolyfluanid) using solid-phase microextraction (SPME) and liquid chromatography (HPLC) with diode-array detection (DAD). The extraction performance of four different SPME coatings, polydimethylsiloxane (PDMS), PDMS/divinylbenzene (PDMS/DVB), carbowax/templated resin (CW/TPR), and polyacrylate (PA) was evaluated using an interface SPME-HPLC. CW/TPR fibre was selected as the most appropriate for the extraction of majority of these pesticides. Three variables (pH, NaCl% and extraction time) were considered key factors in the optimisation process. Interactions between these analytical factors and their optimal levels were investigated by response surface methodology based on central composite design. The method allowed the determination of azoxystrobin, cyprodinil, fenehexamid, fludioxonil, folpet, iprodione, and tolyfluanid in lettuce at concentrations between 0.8 and 25.6 mg/kg, i.e., bellow the maximum residues levels allowed for those compounds in lettuce. Lettuce samples that suffered pesticide treatments with folpet and fenehexamid were analysed during days to harvest to study the dissipation behaviour of the pesticides used. Concentration of folpet was 92.8; 53.4; 22.9; 17.9; 7.45; 1.85 mg/kg and concentration of fenhexamid was 158.1; 76.2; 31.0; 27.3; 7.24; 0.87 mg/kg, respectively for t(0), t(1), t(3), t(6), t(7), t(9) days, and not detected at 64 days for the two pesticides.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Notas: <a href="http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS&DestLinkType=FullRecord&KeyUT=000296124600045 ">Indexado na Web of Science</a> Epub 2011 Jul 31

Nº de páginas: 8