title: Use of SPE-GC/EIMS for residue analysis in wine elaborated from musts spiked with formulations of chlorpyriphos-methyl, methiocarb, dicofol, and cyproconazol.
abstract: The likely presence in wine of residues of the active ingredient and its degradation products, besides the byproducts and excipients of the commercial formulation, has been investigated for four pesticides. Formulations containing chlorpyriphos-methyl, methiocarb, dicofol, and cyproconazol were added to must, which was subjected to a usual vinification. The wines elaborated from must spiked with the formulation of chlorpyriphos-methyl contained two pyridinol compounds in addition to excipients such as alkylbenzenes, naphthalene, and methylnaphthalenes. Methiocarb was hydrolyzed to yield the corresponding phenol, and various unidentified compounds related to cyproconazol were observed in wine. The residues of the dicofol-containing formulation resulted to be dechlorination products; impurities from its commercial formulation were also detected in must and wine extracts. White wines contained higher amounts of residues than red wines. The residues were detected after an SPE followed by GC/EIMS in the scan mode. The concentrations of the active ingredients were determined by a matrix-matched calibration to avoid quantitative errors arising from the matrix.
authors: Department of Analytical Chemistry, Faculty of Sciences, University of Valladolid, Valladolid, Spain. jjimenez@qa.uva.es
authors: Juan José
authors: JJ
authors: Jiménez
authors: José Luis
authors: JL
authors: Bernal
authors: María J
authors: MJ
authors: del Nozal
authors: Laura
authors: L
authors: Toribio
authors: José
authors: J
authors: Bernal
mesh_terms: D004390:Chlorpyrifos / Q000032:analysis* / Q000737:chemistry; D004010:Dicofol / Q000032:analysis* / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D007477:Ions / Q000737:chemistry; D008714:Methiocarb / Q000032:analysis* / Q000737:chemistry; D008745:Methylation; D015394:Molecular Structure; D052616:Solid Phase Extraction / Q000379:methods*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods; D014230:Triazoles / Q000032:analysis* / Q000737:chemistry; D014920:Wine / Q000032:analysis*
chemical_list: D007477:Ions; D014230:Triazoles; C093628:cyproconazole; D004390:Chlorpyrifos; D008714:Methiocarb; D004010:Dicofol