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Objective To establish a method for the determination of glucocorticoids (GCs) (betamethasone and dexamethasone) in livestock and poultry products with 3 kinds of different substrates by high performance liquid chromatography-tandem mass spectrometry. Methods The samples were extracted with ethyl acetate and purified by QuEChERS, filtered by 0.22 µm organic microporous membrane. The target analytes were subjected to qualitative and quantitative analysis by high performance liquid chromatography-tandem mass spectrometry under positive ion mode with multiple reaction monitoring (MRM) pattern, using a mobile phase consisting of 0.1% formic acid aqueous solution and acetonitrile. Results The calibration curve showed a good linear from concentration 0-100 μg/L and the correlation coefficient was greater than 0.9994. The recoveries were from 79.3% to 105.8%, and the relative standard deviations (RSDs) were between 1.4% and 9.4%. The limits of detection (LODs) and limits of quantification (LOQs) of betamethasone were 4.4-4.8 μg/kg and 14.6-15.9 μg/kg respectively. The LODs and LOQs of dexamethasone were 2.7-3.4 μg/kg and 8.9-11.2 μg/kg, respectively. Conclusion The method is suitable for the determination of glucocorticoid residues in livestock and poultry products with its high sensitivity and accuracy.
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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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