Research Article
Preparation and Evaluation of Intravaginal Ring Containing Drospirenone
| Column | Diamonsil C18 (250 mm × 4.6 mm, 5 μm) | Column temperature | Ambient temperature | Mobile phase | Water: acetonitrile (gradient elution process, see Table 2) | Flow rate | 1.5 mL/min | Injection volume | 10 L | Detection | 245 nm | Apparatus | Waters 2695 | Runtime | 80 min | Retention time | About 32 min |
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