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An accurate, sensitive and reproducible high performance liquid chromatographic (HPLC) method for the quantification of doxycycline hyclate in pharmaceutical samples has been developed and validated. The drug and the standard were eluted from a Lichrosorb RP-8 (250 mm×4.6 mm, 10 µm par- ticle size) at 20 °C with a mobile phase consisting of methanol, acetonitrile and 0.010 M aqueous solution of oxalic acid (2:3:5, v/v/v). The flow rate was 1.25 ml min -1 . A UV detector set at 350 nm was used to monitor the effluent. Each analysis required no longer than 4 min. The limits of detection and quan- tification were 1.15 and 3.84 µg ml -1 , respectively. Recoveries for different concentrations ranged from 99.58 to 101.93 %.

A rapid and reliable determination of doxycycline hyclate by HPLC with UV detection in pharmaceutical samples