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Outline
To establish a method for the determination of residues of mepiquat chloride, fluensulfone and its metabolite 3,4,4-trifluorobut-3-ene-1-sulfonic acid in plant-derived foods by liquid chromatography-tandem mass spectrometry.
The samples were acidified, extracted with acetonitrile and the extract was purified by dispersive solid-phase extraction. Detection and confirmation were performed by liquid chromatography-tandem mass spectrometry, and quantification was carried out using matrix spiked calibration curves.
The matrix spiked calibration curves of all analytes showed good linearity in the range of 0.5–25.0 ng/mL, with correlation coefficients r2≥0.9917. For fluensulfone, the average recoveries at low, medium and high concentration levels in 11 kinds of matrices including citrus reticulata, spinach and soybean ranged from 84.0% to 114.2%, with relative standard deviations of 2.7%–13.8%. For 3,4,4-trifluorobut-3-ene-1-sulfonic acid, the average recoveries at the same concentration levels in 11 kinds of matrices including citrus reticulata and apple ranged from 84.6% to 116.4%, with relative standard deviations of 1.7%–14.0%. For mepiquat chloride, the average recoveries at the corresponding concentration levels in 11 kinds of matrices including citrus reticulata and apple ranged from 84.9% to 111.1%, with relative standard deviations of 1.9%–12.2%. In wet samples such as fruits and vegetables, the method limit of detection for all analytes was 0.004 mg/kg, and the limit of quantitation was 0.010 mg/kg. In dry samples such as soybean and rice, the limit of detection for all analytes was 0.010 mg/kg, and the limit of quantitation was 0.025 mg/kg.
This method is rapid, efficient and sensitive, and is suitable for the determination of residues of mepiquat chloride, fluensulfone and its metabolite in plant-derived foods.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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