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Objective To establish a rapid method for the determination of benzo [a] pyrene in vegetable oil by liquid-liquid extraction-high performance liquid chromatography. Methods The sample was extracted by acetonitrile oscillation, and after centrifugation, the supernatant was taken and passed through${0.22\mu }\mathrm{m}$filter membrane, and injected into high-performance liquid chromatograph for measurement. Results were quantified using matrix external standard method. Results Benzo [a] pyrene had a good correlation in the linear range of${0.5}- {20.0}\mathrm{{\mu g}}/\mathrm{{kg}}$, and the correlation coefficient${r}^{2}$was$\geq {0.9990}$. The recoveries at 0.5,2.0 and${10.0}\mathrm{{\mu g}}/\mathrm{{kg}}$were${87.0}\%\sim {111.2}\%$, and the relative standard deviations were${2.2}\%\sim {14.2}\%$. The limits of detection and quantitation were${0.2\mu }\mathrm{g}/\mathrm{{kg}}$and${0.5\mu }\mathrm{g}/\mathrm{{kg}}$, respectively. Conclusion The method is simple, rapid and accurate, and is suitable for the determination of benzo [a] pyrene in vegetable oil.
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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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