Research Article

Preparation and Evaluation of Intravaginal Ring Containing Drospirenone

Table 1

HPLC conditions.

ColumnDiamonsil C18 (250 mm × 4.6 mm, 5 μm)
Column temperatureAmbient temperature
Mobile phaseWater: acetonitrile (gradient elution process, see Table 2)
Flow rate1.5 mL/min
Injection volume10  L
Detection245 nm
ApparatusWaters 2695
Runtime80 min
Retention time About 32 min