期刊
FOODS
卷 12, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/foods12040699
关键词
carbamate; freeze-dried cabbage; modified QuEChERS; neonicotinoid; ultra-performance liquid chromatography-tandem mass spectrometry
This research developed and validated a modified QuEChERS method combined with ultra-performance liquid chromatography-tandem mass spectrometry to determine pesticide residues in freeze-dried cabbage. The method achieved acceptable validation results with low limits of quantification and good recovery rates. The developed method was applied to real freeze-dried cabbages and detected four pesticides in the samples.
Dehydrated vegetables are popular in instant foods, but few reports have focused on their pesticide residues. This research developed and validated a modified QuEChERS method combined with ultra-performance liquid chromatography-tandem mass spectrometry to determine 19 kinds of neonicotinoid and carbamate pesticides in freeze-dried cabbage. Herein, acetonitrile/water (v/v = 2:1) was selected in the extraction step. Meanwhile, 4 g anhydrous magnesium sulfate and 1 g sodium chloride were applied to the partitioning step. Dispersive solid-phase extraction sorbents were selected, and liquid chromatography conditions were further optimized for dealing with the matrix effect. The limits of quantification ranged from 1.0 to 10.0 mu g/kg. The validation results were acceptable, with average recoveries of 78.7-114.0% and relative standard deviations below 14.2%. The method recoveries were closely related to the volume proportion of water in the extractant. Finally, the developed method was applied to real freeze-dried cabbages and four pesticides (propamocarb, imidacloprid, acetamiprid, and thiacloprid) were detected in six samples.
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