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To establish an HPLC-CAD method for the determination of related substances in peramivir injection and to analyze the impurity profile.
Welch Ultimate Polar RP column (250 mm×4.6 mm, 3.5 μm) was used with 5 mmol·L-1 ammonium formate solution (pH adjusted to 4.6 with formic acid) -acetonitrile (95∶5) as mobile phase A and mobile phase A-acetonitrile (50∶50) as mobile phase B under gradient elution at the flow rate of 0.8 mL·min-1. Column temperature was 30 ℃. CAD atomizer temperature was 50 ℃, acquisition frequency was 5 Hz and filter was 3.6 s. The degradation pathway and impurity structure of peramivir were estimated by LC-MS/MS.
The separation between peramivir and the impurities was good. The mass concentration of peramivir and 7 impurities showed good linear relationships with the peak area in the ranges of 0.2-12 μg·mL-1. The limits of quantitation were 4.32-12.8 ng, and the limits of detection were 2.16-6.44 ng. The average recovery (n=9) of impurity Ⅲ was 96.2%, RSD was 1.8%. The control solution and the test product solution were stable for 102 hours at room temperature. After fine-tuning the parameters of liquid chromatography, there was no influence on the detection results of related substances. Based on LC-MS/MS, the structure and possible degradation pathway of the degraded related substances were deduced.
This method is accurate, reliable and specific for the determination of related substances in peramivir injection, and provides a basis for the establishment of quality standards for this variety.
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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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