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To establish an HPLC method for the determination of potentially genotoxic impurity E, impurity I, and 2-chloromethyl-4-methoxy-3，5-dimethlpyridine in esomeprazole sodium.
The chromatographic conditions were as follows: impurity E, YMC-Triart C18 column (250 mm×4.6 mm, 5 μm), mobile phase A 0.05 mol·L-1 monopotassium phosphate buffer, mobile phase B was acetonitrile, the gradient elution program was used at the flow rate of 1.0 mL·min-1, the detection wavelength was 302 nm and the column temperature was 30 ℃. Impurities I, Agilent Microspher C18 column (100 mm×4.6 mm, 3 μm), mobile phase A was water-phosphate buffer (pH 7.6)-acetonitrile(80∶10∶10), mobile phase B was acetonitrile-phosphate buffer (pH 7.6)-water (80∶1∶19), the flow rate was 1.0 mL·min-1, the detection wavelength was 302 nm and the column temperature was 30 ℃. 2-chloromethyl-4-methoxy-3，5-dimethlpyridine, GL Inertsil ODS-3 column (250 mm×4.6 mm, 5 μm), mobile phase A was 0.01 mol·L-1 disodium phosphate solution (pH 6.5), mobile phase B was acetonitrile, the flow rate was 1.0 mL·min-1, the detection wavelength was 265 nm and the column temperature was 30 ℃.
The linear ranges of impurity E, impurity I and 2-chloromethyl-4-methoxy-3，5-dimethlpyridine were 0.025 1-0.200 7, 0.020 2-0.302 7, 0.126 6-2.110 0 μg·mL-1. The LOQ of impurity E, impurity I, 2-chloromethyl-4-methoxy-3，5-dimethlpyridine were 0.50, 0.40, 2.53 ng, and the LOD were 0.15, 0.12, 0.84 ng. The average recovery rate ranged from 96% to 104%, and the RSD was less than 2%. No potential toxic impurities were detected in the samples.
The method has the advantages of good repeatability, high precision, high accuracy and good linearity, and the analysis method are simple and efficient.
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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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