Determination of Enantiomeric Purity of GSK962040 Based on Liquid Chromatography Using Chiral Stationary Phase Combined with a Pre-column Derivatization Procedure

A sensitive and accurate LC method was developed and further validated for the determination of enantiomeric purity of GSK962040. Before separation, a pre-column derivatization procedure was performed. Baseline separation with a resolution higher than 1.9 was accomplished within 15 min using a Chiralpak AD-H (250 × 4.6 mm; particle size 5 μm) column, with n-hexane: 2-propanol (85:15 v/v) as mobile phase at a flow rate of 1 mL min^?1. The eluted analytes were subsequently detected with a UV detector at 260 nm. The effects of mobile phase components and temperature on enantiomeric selectivity as well as resolution of enantiomers were thoroughly investigated. The calibration curves were plotted within the concentration range between 4 and 200 μg mL^?1 (n = 8), and recoveries between 98.15 and 101.48% were obtained, with relative standard deviation (RSD) lower than 1.42%. The LOD and LOQ for the Boc-GSK962040 were 1.23 and 4.15 μg mL^?1 and for its enantiomer were 1.38 and 4.76 μg mL^?1, respectively. The developed method was also evaluated and validated by analyzing bulk samples with different enantiomeric ratios of GSK962040. It was demonstrated that the method was accurate, robust and sensitive, and also had practical utilities for real analysis.