Validation of a HPLC Method for the Analysis of Decomposition Products of Diazepamin Injections

Overview

Diazepam is an important drug from the group of benzodiazepines, used in clinical practice for itssedative, hypnotic, anticonvulsive, myorelaxant, and primarily anxiolytic effects. Several kineticstudies have been published which show that diazepam is a drug sensitive to hydrolysis both in acidand alkaline media. The present study aimed to elaborate and validate a simple and rapid HPLC/UVmethod for simultaneous analysis of three decomposition products of diazepam in the presence ofdiazepam and to apply it also on the control of stability of the injectional solution of diazepam. Theoptimization of chromatographic conditions resulted in the use of the high-performance chromatographiccolumn Zorbax ODS, the mobile phase represented by a mixture of acetonitrile/water ina ratio of 60/40 (w/w, %), flow rate 1.5 ml/min, and spectrophotometric detection at 242 nm. Theelaborated method and the employed chromatographic systemwere successfully validated and theycan be used in practice in the control of stability of injection solution of diazepam.

Key words:
HPLC/UV – diazepam – 2-amino-5-chlorobezophenone –2-methylamino-5-chlorobezophenone –3-amino-6-chloro-1-methyl-4-phenylcarbostyril – validation