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To establish a method to determination of the related substances and polymer impurities in cefminox sodium for injection.
Cefminox sodium was degraded in high temperature to prepare degradation solution. An RP-HPLC method for the related substances analysis was established with a Kromisil C18 column (250 mm×4.6 mm, 5 μm), using 10 mmol·L-1 phosphate buffer solution (pH 2.0)-acetonitrile (98：2) (A)-acetonitrile (B) with gradient elution at a flow rate of 1.0 mL·min-1. The column temperature was maintained at 25 ℃, the detection wavelength was set at 254 nm, and the injection volume was 20 μL. The specificity of RP-HPLC method and identification of unknown impurities was researched by 2D HPLC-MS/MS.
14 main impurities were characterized in the degradation solution, including 3 cefminox dimmers and isomers which were characterized firstly. The impurities were determined in 7 batches of samples by principal component self-control with correction factor, the contents of impurity 3 were 0.01%-0.13%, the contents of impurity 4 were 0.10%-0.16%, the contents of impurity 5 were 0.02%-0.07%, the contents of impurity 6 were 0.04%-0.07%, the contents of polymer impurities were 0.03%-0.06%, the maximum single impurity contents were 0.01%-0.03%, while the total impurity contents were 0.28%-0.63%.
Cefminox degradation solution in high temperature can be used to identify related impurities and polymer peaks as the systematic suitability testing solution. The RP-HPLC method was suitable for related substances as well as polymer impurities in cefminox sodium for injection. This work provides useful information for the quality control of cefminox sodium, which can contribute to establishment of reasonable impurity limits.
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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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