Assay of cyproheptadine hydrochloride and the related substances with HPLC

Abstract

Objective To establish a HPLC method for the assay of cyproheptadine hydrochloride and the related substances. Methods The HPLC was performed on an Agilent Eclipse XDB-C18 column (4.6 mm×250 mm, 5 μm) at the temperature of 25℃ with the mobile phase of acetonitrile-buffer Solution (Dissolve 2.16 g of sodium octane-1-sulfonate with about 500 ml of water and mix well. Add 10.0 ml of glacial acetic acid and 5.0 ml of triethylamine, and dilute with water to 1 000 ml, mix well and adjust to pH 7.0 with triethylamine) (85:15,V/V). The flow rate was 1.0 ml/min and detection wavelength was 286 nm. The injection volume was 10 μl. Results The calibration curves of cyproheptadine hydrochloride, impurity A, B and C showed good linear response in the range from 0.056 2 to 5.620 μg/ml (r=0.999 8), 0.052 4 to 5.240 μg/ml(r=1.000 0),0.050 3 to 5.032 μg/ml (r=0.999 9) and 0.053 2 to 5.316 μg/ml(r=0.999 8) respectively. The LOQs for cyproheptadine hydrochloride, impurity A, B and C were within 0.049-0.054 μg/ml, LODs were within 0.019-0.022 μg/ml with recovery between 98%-100%. RSD of repeatability was 5.5% (n=6). Conclusion This method gave an accurate and reliable results. It can be used for quality control of cyproheptadine hydrochloride.