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Objective To establish the detection of 172 kinds of pesticide residues in brown sugar by QuEChERS-gas chromatography-tandem mass spectrometry (GC-MS/MS). Methods The samples were fully dissolved in ultrapure water and extracted by high-speed homogenization of n-hexane, nitrogen blowing and concentration, and purified by QuEChERS method, and the data was collected in selective reaction monitoring mode by GC-MS/MS detection technology, and quantitatively detected by matrix curve and solvent curve. Results The 172 kinds of pesticides had a good linear relationship in the linear range of 10-200 ng/mL, and the linear correlation coefficient was between 0.9962 and 0.9999, the limit of quantification of the method was 0.01 mg/kg, performed 6 repeated spiked experiments at concentrations 1, 2, and 10 times the limit of quantification each, the recovery rate of spikes was between 71.0%-113.0%, and the relative standard deviation (n=6) was 0.49%-17.00%. Conclusion This method can detect hundreds of pesticides in one injection, which is fast, simple, high-throughput and economical, and is suitable for the detection of a variety of pesticide residues in brown sugar.
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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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