Research Article
Preparation and Evaluation of Intravaginal Ring Containing Drospirenone
Table 2
The gradient elution process for HPLC of drospirenone.
| (min) | Water (%) | Acetonitrile (%) | Elution |
| 0–28.5 | 64 | 36 | isocratic | 28.5–45 | 64–100 | 36–90 | Linear gradient | 45–45.5 | 10–0 | 90–100 | Linear gradient | 45.5–52 | 0 | 100 | isocratic | 52-53 | 0–64 | 100–36 | Linear gradient | 53–80 | 64 | 36 | Reequilibration |
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