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Objective To establish and optimize conditions for the determination of octachlorostyrene residues in milk by high performance liquid chromatography (HPLC) method. Methods Milk samples were extracted with acetonitrile and cleared up by sodium chloride and anhydrous magnesium sulfate, filtered through a microporous membrane, and analyzed by the high performance liquid chromatography. The separation was performed on a Waters C18 column (250 mm×4.6 mm, 5 μm) with gradient elution by using 0.3% trifluoroacetic acid solution (pH=3.2) and acetonitrile (20:80, V:V) as the mobile phase, and quantified by external standard method. Results The results indicated that the correlations were greater than 0.999 at the range of 0.1 to 2.0 ng/mL. The limit of detection of octachlorostyrene was 0.05 μg/kg, and the limit of quantitation was 0.1 μg/kg. The average recoveries of octachlorostyrene ranged from 70% to 90% at spiled levels of 0.1 to 0.4 μg/kg with relative standard deviation less then 10%. Conclusion The experiment show that the method is simple, rapid, high sensitivity, good reproducibility and suitable for detection of octachlorostyrene residues in milk. The method provide effective technical support to the government’s food and agricultural product quality supervision work.
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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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