An improved RP- HPLC method with PDA detection has been developed and validated for the simultaneous
estimation of artemisinin and dexamethasone in ocular nanodispersion formulations and it has been successfully adopted
to check the ex-vivo corneal transport. The chromatographic separation was achieved using phenomenex C18 column (250 ×
4.6 mm, 5 µm) analytical column and the mobile phase consisting of acetonitrile: (methanol : water, 4: 6) mixture at the
ratio of 45: 55, v/v at a flow rate of 1.0 mL/min and injection volume of 200 µl. The column temperature was maintained
at 50°C. The UV detection was carried out at 219 nm using photodiode array detector. The retention times of dexamethasone
and artemisinin were found to be 4.5 and 7.9 minutes respectively. Artemisinin and dexamethasone calibration
curves were found to be linear with correlation coefficient of 0.9617 and 0.9954 respectively at a dynamic concentration
ranging from 250ng/mL to 1250 ng/mL. Recovery was between the ranges of 98.9% - 116.8% for both artemisinin and
dexamethasone. The developed method is very selective as both peaks were well separated with a short analysis time of
10 minutes and does not require any preliminary treatment of sample.
Keywords: Artemisinin, dexamethasone, RP- HPLC, quantification, nanodispersions.
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