Full
Outline
To investigate the distribution characteristics and migration rules of pesticide residues in different parts of Citrus reticulata ‘Chachi’, and establish a rapid pesticide residue detection method suitable for the matrix of Citrus reticulata ‘Chachi’.
A pesticide residue detection method combining QuEChERS pretreatment with high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was established and verified. This method was applied to analyze the differences in residual content of 10 kinds of common pesticides in the peel and pulp of Citrus reticulata ‘Chachi’ from 4 research bases, and detect the pesticide residue status in the whole fruit, peel and pulp from 40 actual production bases. Meanwhile, the migration capacity of the 10 kinds of pesticides was classified via K-means cluster analysis.
The established method showed a good linear relationship in the mass concentration range of 0.01–0.50 mg/L (r2≥0.99215), with the spiked recovery rate of 80.0%–110.0% and the relative standard deviation of 0.6%–6.3%. Pesticide residues in Citrus reticulata‘Chachi’ presented significant differences in different parts, and both the detected types and concentrations followed the gradient rule of “peel>whole fruit>pulp”, with the average residual concentration in peel being 2.7 times that in pulp. In addition, the migration capacity of pesticides with different chemical properties could be divided into 3 levels(high, medium and low). The pesticide residue content in the whole fruit, peel and pulp of samples from 40 actual production bases did not exceed the the limit requirements of GB 2763—2026 National food safety standard-Maximum residue limits for pesticides in food.
The QuEChERS-HPLC-MS/MS detection method established in this study is accurate and reliable, which can serve as an exclusive technical means for the detection of pesticide residues in Citrus reticulata ‘Chachi’. The clarified distribution and migration rules of pesticide residues in Citrus reticulata ‘Chachi’ provide direct scientific basis for the scientific selection and rational application of pesticides in the planting process of Citrus reticulata ‘Chachi’, and have important practical significance for the quality and safety control of the Citrus reticulata ‘Chachi’ industry.
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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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