Separation and quantitation of Z-isomer in lanoconazole by normal phase HPLC.

An isocratic normal phase high-performance liquid chromatographic (NP-HPLC) method has been developed and validated for the quantitation of Z-isomer in lanoconazole. Separation was achieved with a Thermo Hypersil Silica column. The ratio of 2-propanol, n-hexane and triethylamine in the mobile phase were optimized to obtain the best separation. UV detection was performed at 296 nm. The described method is linear over a range of LOQ--15.0 microg/ml of Z-isomer. The mean recovery of Z-isomer was found to be in the range of 97-99%. The method is simple, rapid, selective, accurate and precise, useful in the quality control of bulk manufacturing.