Full
Outline
To establish a method for the determination of 16 kinds of fluorinated liquid-crystal compounds in meats including pork, beef, lamb and chicken by gas chromatography-tandem mass spectrometry.
After ultrasonic extraction with N-hexane/dichloromethane (1:1, V:V), the samples were purified via Florisil solid-phase extraction column, and then separated by DB-5MS gas chromatographic column. Atmospheric pressure chemical ionization source in positive ion mode was adopted, and multiple reaction monitoring was performed by gas chromatography-tandem mass spectrometry with internal standard method for quantitative analysis.
The linear relationship of the 16 kinds of fluorinated liquid-crystal compounds was good within the range of 0.1–50.0 μg/L, and the correlation coefficient was greater than 0.995. The limits of detection were 0.02–0.18 μg/kg, and the limits of quantitation were 0.07–0.59 μg/kg. At the spiked levels of 1.0, 10.0 and 50.0 μg/kg, the recoveries ranged from 86.3% to 113.7%, the relative standard deviations were 1.4%–11.2%.
The method is simple, quick, accurate and sensitive. It is suitable for the confirmation and quantification of fluorinated liquid-crystal compounds in meat samples. This method can provide a reference and technical support for the quality and safety screening of meat samples.
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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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