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Objective To study the residual behavior and dietary risk assessment of oxine-copper in Prunus persica. Methods The samples were extracted by homogenate with acetonitrile-10% acetic solution, centrifuged after salting out, detected by ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS), and quantified by external standard method. Results There was a good linear relationship in the range of 0.0025 to 0.2500 mg/L, and the correlation coefficients was 0.999; in the range of 0.01 to 1.00 mg/kg; the average recoveries of oxine-copper in Prunus persica ranged from 86% to 102%, with the relative standard deviation was 1.4% to 6.0%, and the limit of quantification was 0.01 mg/kg. The dissipation process of oxine-copper in Prunus persica followed a first-order kinetic model. The dissipation half-lives of oxine-copper in Prunus persica from Ningxia, Beijing, Shandong and Sichuan were 13.9, 9.9, 7.7 and 23.1 days, respectively, and the correlation coefficients ranged from 0.635 to 0.948, after 14 days of application, the maximum residual amount of oxine-copper in Prunus persica samples was 0.920 mg/kg. The dietary risk assessment showed that after 14 d of application, the probability of dietary intake risk in the general population was far less than 100%. Conclusion This method is simple, accurate, and highly sensitive, and is suitable for the residual detection oxine-copper in Prunus persica. The final residue tests show that the amount of copper quinoline residue does not exceed the established maximum residue limits, and does not pose an unacceptable risk to the health of the general population.
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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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