Journal
JOURNAL OF SEPARATION SCIENCE
Volume 45, Issue 5, Pages 1059-1066Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.202100913
Keywords
absolute configuration; cellulose tris(4-methylbenzoate); citalopram; escitalopram; green HPLC
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Normal-phase and reversed-phase high-performance liquid chromatography methods were developed to separate the active pharmaceutical ingredient escitalopram from its (R)-enantiomer impurity. Both methods used ethanol as a cosolvent and achieved complete enantioseparation without interference from other associated chiral impurities.
Normal-phase and reversed-phase high-performance liquid chromatography methods for the separation of the active pharmaceutical ingredient escitalopram from its (R)-enantiomer impurity have been developed on the cellulose-based Chiralcel OJ-H chiral stationary phase. Both methods share two features: they use ethanol as a cosolvent and are able to give a complete enantioseparation without interference from other associated chiral impurities. With the green eluent mixture ethanol-water-diethylammine 70:30:0.1 (v/v/v), the resolution between escitalopram and (R)-enantiomer was 2.09 at 30 degrees C. The limits of quantification for the (S) and (R) enantiomers were 4.5 and 3.8 mu g mL(-1), respectively.
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