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To establish an amino solid-phase extraction-HPLC method for the determination of three related substances in eldecalcitol soft capsules.
The eldecalcitol soft capsules were extracted by an amino solid-phase extraction method, followed by eluting with ethyl acetate: n-hexane and anhydrous ethanol. The residue was then dissolved with acetonitrile and water after vacuum evaporation. An ODS column (250 mm×4.6 mm, 5 μm) was used. Water-acetonitrile with gradient elution was employed. The flow rate was 1.0 mL·min-1, the injection volume was 50 μL, and the detection wavelength was set at 265 nm.
Interference from blank excipients was eliminated with pretreatment. Baseline separation and good selectivity of eldecalcitol and other impurities was achieved. The stability of the test and reference solution was investigated at 4 ℃. The area change percentage of the impurities in the test solution were 98.6%-102.3% at 24 h. The area change percentage of the impurities in the reference solution were 101.2%, 96.9%, 98.5% and 96.2% at 24 h, respectively. The quantitation limits of eldecalcitol, trans impurity, pre-eldecalcitol and tachy impurity were 0.107 μg·mL-1, 0.102 μg·mL-1, 0.128 μg·mL-1 and 0.063 μg·mL-1, respectively. The detection limits were 0.054 μg·mL-1, 0.051 μg·mL-1, 0.064 μg·mL-1, 0.031 μg·mL-1, respectively. The linear ranges of 4 components were 0.1-6.3 μg·mL-, 0.1-1.2 μg·mL-, 0.1-5.6 μg·mL-and 0.1-1.1 μg·mL-1, respectively. The correlation coefficients（n=5） were 0.999 9, 1.000, 1.000 and 0.999 4, respectively. The average recoveries （n=6）of tachy impurity, pre-eldecalcitol and trans impurity were 106.6%, 88.6% and 102.8% with RSDs of 6.7%, 3.1% and 2.1%, respectively. In the three batches of samples, no impurities were detected except pre-eldecalcitol. The contents of pre-eldecalcitol were 5.0%, 5.0% and 5.1%, respectively.
The method is simple to operate, economical and practical with high safety, strong specificity, good repeatability and high accuracy. The method provides a reliable basis for the study of drug quality such as eldecalcitol soft capsules and drugs with similar oily substrate.
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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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