Abstract
The capillary zone electrophoresis method was developed for the chiral separation of R,S-cinacalcet. Cyclodextrins with different substituents were tested in both acidic and alkaline background electrolytes. The non-ionic cyclodextrin, 2-hydroxypropyl-γ-cyclodextrin, was selected as the best chiral selector. The separation was performed using a positive voltage in a phosphate buffer at pH 2.5. The analytes studied were separated within 12 min. The proposed method was applied to the analysis of tablets containing R-cinalcalcet as the active substance. The enantiopurity of R-cinacalcet in the tablets studied was confirmed. Subsequently, the analysis of tablets spiked with S-cinacalcet (chiral impurity) was also performed. The method here presented makes possible the determination of 0.1 % of S-cinacalcet in tablets. The analytical characteristics of the method, such as linearity, recovery and RSD values of the peak area and the migration time, were evaluated. The inter-day RSD values of the peak area and the migration time were lower than 3.71 % and 1.3 %, respectively.
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Ginterová, P., Znaleziona, J., Knob, R. et al. Enantiomeric purity control of R-cinacalcet in pharmaceutical product by capillary electrophoresis. Chem. Pap. 70, 1024–1030 (2016). https://doi.org/10.1515/chempap-2016-0047
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DOI: https://doi.org/10.1515/chempap-2016-0047