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To establish a rapid and accurate ultra performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) method for the detection of dextromethorphan and one metabolite dextrorphan in hair.
The hair sample containing dextromethorphan and dextrorphan were extracted with methanol containing internal standard proadifen hydrochloride(SKF525A). The extract was filtered with 0.22 μm organic filter membrane and detected by UPLC-MS/MS. All components were separated by an ACQUITY UPLC HSS T3 column (100 mm×2.1 mm, 1.8 μm), using a gradient elution procedure consisting of 0.2% formic acid (10 mmol·L-1 ammonium formate) and acetonitrile, at a flow rate of 0.3 mL·min-1, and the column temperature was room temperature. Positive electrospray ionization was performed using multiple reaction monitoring mode (MRM).
The linear relationships of dextromethorphan and dextrorphan were good in the range of 1-100 ng·mL-1. The linear equations were Y=1.349 49X-0.020 80 (r=0.998 8) and Y=0.775 10X-0.013 87 (r=0.999 1), respectively. The detection limit and quantitation limit were 0.010 ng·mL-1 and 0.025 ng·mL-1 respectively. Their recoveries ranged from 97.0%-104.8%. The intra-day RSD and inter-day RSD were 1.5%-3.9% and 2.1%-5.5%, respectively. The method was applied to cases, and the results showed that dextromethorphan and dextrorphan were detected in the hair of 6 abusers.
This method is simple and sensitive enough to be applied to detect dextromethorphan and one metabolite dextrorphan in hair.
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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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