Gas chromatographic-mass spectrometric method for the analysis of dimethomorph fungicide in dried hops.
An analytical method for the determination of dimethomorph [(E,Z)-4-[3-(4-chlorophenyl)-3-(3,4-dimethoxyphenyl)acryloyl]morpholine] residues in dried hops was developed utilizing liquid-liquid partitioning, automated gel permeation chromatography (GPC), Florisil and aminopropyl solid phase extraction (SPE) column cleanups, and gas chromatography (GC) with mass selective detection (MSD). Method validation recoveries from dried hops ranged from 79 to 103% over four levels of fortification (0.1, 1.0, 5.0, and 20 ppm). Control and dimethomorph-treated hop samples collected from three field sites had residue levels of <0.10 and 4.06-17.32 ppm, respectively. The method was validated to the limit of quantitation at 0.10 ppm. The limit of detection for this method was 0.045 ppm.
Hengel
M J
MJ
Department of Environmental Toxicology, University of California at Davis, One Shields Avenue, Davis, California 95616, USA. mjhengel@ucdavis.edu
Shibamoto
T
T
D005659:Fungicides, Industrial / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D019684:Magnoliopsida / Q000737:chemistry; D009025:Morpholines / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D010945:Plants, Edible / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D005659:Fungicides, Industrial; D009025:Morpholines; D010573:Pesticide Residues; C076154:dimethomorph