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A capillary electrophoresis method for the determination of the linagliptin enantiomeric impurity
Author(s) -
Mai XuanLan,
Pham ThuyVy,
Le ThiAnhTuyet,
Nguyen BaoTan,
Nguyen Ngoc Van Thi,
Kang JongSeong,
Mar Woongchon,
Kim Kyeong Ho
Publication year - 2020
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.202000493
Subject(s) - capillary electrophoresis , enantiomer , linagliptin , cyclodextrin , chromatography , chemistry , electrolyte , impurity , resolution (logic) , electrophoresis , capillary action , analytical chemistry (journal) , materials science , electrode , stereochemistry , organic chemistry , type 2 diabetes , medicine , artificial intelligence , computer science , composite material , diabetes mellitus , endocrinology
Linagliptin is a highly specific, long‐acting inhibitor that is used as an orally administrable agent for type‐2 diabetes treatment. Because only the R‐enantiomer is of clinical use, we developed a capillary electrophoresis method for the determination of the enantiomeric impurity of this compound. Carboxymethyl‐β‐cyclodextrin was selected as the chiral selector for the separation of linagliptin enantiomers. Design of experiments and desirability functions were used for the analytical optimization, which was focused on understanding and improving the electrophoretic process. The effects of significant parameters (background electrolyte concentration and pH, cyclodextrin concentration, temperature, and voltage) were thoroughly investigated. The complete separation of linagliptin and its enantiomeric impurity with baseline resolution was achieved within 10 min on an uncoated fused‐silica capillary (50 μm inner diameter, 365 μm outer diameter, 64.5/56 cm in total/ effective length) maintained at 25°C, under an applied voltage of 28.0 kV. The background electrolyte contained 70 mM sodium acetate and 4.7 mM carboxymethyl‐β‐cyclodextrin, and the pH was adjusted to 6.10. The method was validated, and a limit of quantitation of 0.05% for the impurity was estimated.