A validated chiral LC method for the enantiomeric separation of AT13148 on polysaccharide-based chiral stationary phase

A sensitive and accurate LC method for the determination of AT13148 enantiomeric purity has been developed and validated. Baseline separation with a resolution higher than 1.8 was accomplished within 15 min using a Chiralpak AD-H column (250 x 4.6 mm; particle size 5 mu m) and n-hexane: 2-propanol: diethylamine (85:15:0.1, v/v) as mobile phase at a flow rate of 1 mL min(-1). Eluted analytes were monitored by UV absorption at 254 nm. The effects of mobile phase components, temperature and flow rate on enantiomeric selectivity and resolution of enantiomers were investigated. Calibration curves were plotted within the concentration range between 7 and 500 mu g mL(-1) (n = 11), and the recoveries between 98.24 and 100.99% were obtained, with relative standard deviation lower than 1.32%. LOD and LOQ for AT13148 were 2.46 and 7.38 mu g mL(-1) and for its enantiomer were 2.54 and 7.49 mu g mL(-1), respectively. It was demonstrated that the developed method was accurate, robust and sensitive for the determination of enantiomeric purity of AT13148, especially for the analysis of bulk samples.