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Objective To establish a method for the rapid detection of 15 N-nitrosamines in bacon by enhanced matrix removal dispersive solid phase extraction combined with gas chromatography-tandem mass spectrometry (GC-MS/MS). Methods The samples were extracted with acetonitrile oscillation, frozen for 30 minutes, and then centrifuged at low temperature. The extract was further purified using an enhanced lipid removal purification tube (QuEChERS EMR-lipid) and an EMR-lipid stripping tube. The N-nitrosamines were separated on a polar capillary column, detected in the multiple reaction monitoring (MRM) mode and quantified by the matrix-matched external standard method. Results The linear correlation coefficients of the method were greater than 0.990 in the range of 0.2-40.0 μg/L, with the detection and quantification limits of 0.03-0.30 and 0.1-1.0 μg/kg, respectively. The recoveries were 64.1%-106.1% at three spiked levels (2.0, 5.0, 10.0 μg/kg)，with the relative standard deviations (RSDs) ranging from 3.48% to 14.55%. Conclusion The method does not require activation, equilibration, or elution steps, consumes less solvent, is simple and rapid, and is suitable for the rapid detection of 15 N-nitrosamines in bacon.
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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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