Enantioselective separation of eight antihistamines with α1-acid glycoprotein-based chiral stationary phase by HPLC: Development and validation for the enantiomeric quality control

In the present paper, a sensitive and selective chiral LC method has been developed for enantiomeric separation and determination of eight antihistamines in pharmaceutical formulations. Enantiomeric separation was achieved on the alpha(1)-acid glycoprotein-based chiral stationary phase known as Chiralpak AGP. The effects of the mobile phase composition, type and proportion of organic modifier and the concentration and pH of the buffer on retention and resolution were fully investigated. All enantiomers of target analytes were successfully separated with the mobile phase consisting of methanol and 10 mM ammonium acetate buffer, at a flow rate of 0.9 mL min(-1). Calibration curve of each enantiomer was linear over the concentration range of 5.0-100 mu gmL(-1), with the correlation coefficient above 0.9990. The limits of detection and quantification were below 0.80 and 3.18 mu g mL(-1), respectively. The recoveries were in the range of 98.0-102.4% with the relative standard deviation lower than 2.88% for all enantiomers. The validated method was demonstrated to be suitable for the quality control of the enantiomeric composition of antihistamines present in pharmaceuticals. Finally, the proposed chiral LC method was applied to the determination of antihistamines enantiomers in commercially available tablets containing racemic mixtures of compounds. Quantitative results of the commercial tablets demonstrated that the difference between the declared and determined values did not exceed 1.45%, and chiral antihistamines drugs were present in the form of racemates. (C) 2019 Elsevier B.V. All rights reserved.