Full
Outline
To establish a method for the rapid analysis of clothianidin, thiamethoxam and imidacloprid residues in Zingiber officinale Rosc by liquid chromatography-tandem mass spectrometry, and conduct dietary risk assessment for them.
The crushed Zingiber officinale Rosc samples were extracted and purified by QuEChERS method. The purified supernatant was separated on Agilent ZORBAX Eclipse Plus C18 column. The 3 kinds of pesticides were quantitatively analyzed in multiple reaction monitoring (MRM) mode. The point assessment method was used to conduct chronic and acute dietary risk assessments for 3 kinds of pesticides.
The correlation coefficients of 3 kinds of pesticides in the range of 0.005–0.200 mg/L were more than 0.995. The limits of detection of the method were 0.00071–0.00280 mg/kg, and the limits of quantitation were 0.00240–0.00930 mg/kg. The average recoveries of 3 kinds of pesticides were 85%–112% at the spiking levels of 0.01, 0.02 and 0.10 mg/kg with relative standard deviations at the range of 0.7%–8.6%. The chronic and acute dietary risk levels of 3 kinds of pesticides were significantly lower than 100%.
The method has the advantages of simple operation, high accuracy and high speed, and can be used for the analysis of 3 kinds of pesticide residues in Zingiber officinale Rosc. The dietary risk levels of 3 kinds of pesticides are relatively low, and the risks are controllable.
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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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