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To establish an HPLC-principal component self-compare with correction factor method for quantification of two related substances (N-deacetyllappaconitine and ranaconitine) in lappaconitine hydrobromide injection.
The analysis was performed on a Kromasil 300-5-C18 (250 mm×4.6 mm，5 μm) column with a mobile phase composed of 0.04 mol·L-1 potassium dihydrogen phosphate solution，methanol and acetonitrile (68:17:15). The detection wavelength was 252 nm，the flow rate was 0.8 mL·min-1，the column temperature was 37 ℃，and the injection volume was 10 μL. The slope of linear equation was used to determine the relative correction factor between the two impurities and lappaconitine hydrobromide. The relative retention time was used to determine the position of related substances. The contents of two impurities in 25 batches of lappaconitine hydrobromide injection produced by four pharmaceutical companies were determined and compared with the results of the external standard method.
Lappaconitine hydrobromide and the impurities were separated well by this method. The relative retention time of N-deacetyllappaconitine and ranaconitine were 1.20 and 1.39，and the correction factors were 1.23 and 0.94，respectively. Lappaconitine hydrobromide，N-deacetyllappaconitine and ranaconitine showed good linearity in the mass concentration ranges of 0.951 7-38.07 μg·mL-1，1.047-41.87 μg·mL-1 and 1.001-40.02 μg·mL-1 with r=1.000，respectively. The average recovery rates of lappaconitine hydrobromide，N-deacetyllappaconitine and ranaconitine were 100.2%，100.5% and 100.5% respectively，with RSD less than 2.0%. The limits of detection (LOD) of lappaconitine hydrobromide，N-deacetyllappaconitine and ranaconitine were 0.095，0.10，0.10 μg·mL-1 and the limits of quantitation (LOQ) were 0.32，0.35 and 0.33 μg·mL-1，respectively. The content of N-deacetyllappaconitine in 25 batches of lappaconitine hydrobromide injection was in the range of 0.31%-0.82% and the content of ranaconitine was in the range of 0%-0.09%. It was consistent with the determination result of the external standard method.
The method is proved to be simple，rapid，and accurate for the determination of related substances in lappaconitine hydrobromide injection.
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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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