Gas chromatographic determination of azoxystrobin, dinocap, fenarimol, penconazole and quinoxyfen during wine making

A quick gas chromatographic method is described to determine residues of azoxystrobin, dinocap, fenarimol, penconazole and quinoxyfen in grapes, must, marc and wine. The samples were extracted with hexane-ethyl acetate and directly analyzed using a high resolution gas chromatograph fitted with an electron-capture detection system (ECD). No clean-up was necessary because there were no interferences in the chromatogram. Recoveries from untreated samples spiked with known - Key words: fungicides, grapes, marc, must, wine -amounts of the pesticides (0.01, 0.1 and 1.0 mg/kg) ranged from 80.4% (marc) to 100.7% (grapes) for azoxystrobin; from 81.8% (marc) to 110.4% (wine) for dinocap; from 82.8% (grapes) to 98.2% (wine) for fenarimol; from 80.9% (marc) to 97.3% (wine) for penconazole; from 87.0% (wine) to 95.8% (wine) for quinoxyfen. The limits of quantitation were 0.010 mg/kg for dinocap and 0.005 mg/kg for the other fungicides; the detection limits were 6x10-4ng for dinocap and 3x10-4ng for the others.