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Outline
To establish a method for rapid determination of derquantel residues in 4 kinds of sheep edible tissues by dispersive solid-phase extraction coupled with liquid chromatography-tandem mass spectrometry.
Veterinary drug residues in samples were extracted with acetonitrile, and the extracts were purified via dispersive solid-phase extraction. Gradient elution was performed on a C18 chromatographic column using 5 mmol/L ammonium formate solution-acetonitrile as the mobile phase. Detection was carried out in positive electrospray ionization mode, and quantification was achieved by matrix-matched external standard method.
The results showed that there were good linearity in the range of 0.01–20.00 μg/L for the 4 kinds of matrix-matched calibration curves, and the correlation coefficients were above 0.999. The limit of detection and limit of quantitation were 0.03 μg/kg and 0.10 μg/kg, respectively. The average recoveries ranged from 89.9% to 99.8%, with relative standard deviations below 10%.
This method is rapid and sensitive, and can be used for the practical determination of derquantel residues in sheep edible tissues.
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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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