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Determination of residues of propamocarb in wine by liquid chromatography-electrospray mass spectrometry with direct injection

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A simple, sensitive and reliable liquid chromatography-mass spectrometry method with direct injection of diluted samples is reported for the determination of propamocarb residues in wine. Red and white wines were diluted 40- and 20-fold, respectively, using water. Liquid chromatography was performed with a mobile-phase gradient and detection was by electrospray mass spectrometry in a positive ionization mode. Propamocarb was detected as the protonated molecular species at m/z 189. Using matrix-matched calibrant solutions, a calibrated range equivalent to 0.05-2.0 mg kg−1 in red and white wines and limits of detection of 0.025 mg kg−1 for white wine and of 0.05 mg kg−1 for red wine (0.00125 g ml−1 of sample solution injected) were readily achievable. Recovery of propamocarb hydrochloride from wine spiked before dilution was in the range 91-115%. The chromatograms were free of isobaric interferences. In a small wine survey (72 samples), no residues of propamocarb were detected above 0.1 mg kg−1.
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Keywords: fungicide residue; liquid chromatography-mass spectrometry (LC/MS); pesticide analysis; proamocarb; wine

Document Type: Research Article

Affiliations: Central Science Laboratory Sand Hutton York YO41 1LZ UK

Publication date: June 1, 2004

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