Elaboration and validation of a new capillary electrophoresis (CE) method in non-aqueous milieu for the analysis of hypoglycemic drug repaglinide in pharmaceuticals

Abstract

Capillary electrophoresis (CE) method in non-aqueous medium was developed and validated for determination of repaglinide in pharmaceutical formulation. CE was performed using a 75 µm x 90 cm fused silica capillary (76 cm effective length) and UV detection at 240 nm. 0.01 mol/l solution of ammonium acetate in the mixture of methanol-acetonitrile (3:7, v/v), 30 kV voltage, 30°C temperature and hydrodynamic injection (10 mbar, 6 s) were chosen as CE parameters. The solutions were prepared in methanol. The proposed CE method demonstrated sufficient stability and reproducibility with mean RSD values of less than 2.5%. The robustness, selectivity, linearity, accuracy and precision were sufficient for quantitative determination of repaglinide for different pharmaceutical purposes.