Enantioseparation of amino acid analogues racemic β-amino alcohols has hitherto been thought impossible without prior derivatization. Method developers of chromatographic enantioseparation often face detection challenge due to low ultraviolet (UV) absorbance of these molecules. A new chiral derivatizing reagent, benzimidazole-(S)-naproxen amide, was synthesized to provide UV detectable chiral m...

Preparative chiral chromatography has recently become a preferred method for rapidly accessing enantiopure compounds in the pharmaceutical industry [1–8]. While preparative chromatographic enantioseparation has been practiced for a number of years by specialized researchers, the current widespread interest in the approach can be attributed in part to advances in equipment and stationary phases,...

The enantioseparation of eighteen new chiral hydantoin derivatives was studied on three different polysaccharide type chiral stationary phases (CSP) Chiralpak AD, Chiralcel OD and Chiralcel OJ in the normal-phase HPLC mode. Chiralpak AD material exhibited the most universal chiral resolving ability and allowed the enantioseparation of 17 out of 18 compounds followed by Chiralcel OD (10 enantios...

The belief that pure single enantiomers would provide safer and more effective alternatives to racemates, has resulted in a greater stress on the evaluation and development of single isomers as drug products. Almost half of the drugs in use today are chiral. It is well established that the pharmacological activity is mostly restricted to one of the enantiomers and the individual enantiomers of ...

The HPLC enantiomeric separation of 29 racemic bridged polycyclic compounds was examined on commercially available Chiralcel OD-H and Chiralpak OT(+) columns. The separations were evaluated under normal-phase mode (hexane containing mobile phase) for Chiralcel OD-H and under normal-phase as well as under reversed-phase mode (pure MeOH, temperature 5 degrees C) for Chiralpak OT(+). Almost all co...

Simultaneous enantioseparation of three chiral triazole fungicides i.e. penconazole, myclobutanil and triadimefon by cyclodextrin-modified micellar electrokinetic chromatography (CD-MEKC) under acidic condition was investigated with different HP-γ-CD concentrations as chiral selector. The three triazole fungicides have an asymmetrically substituted carbon atom respectively, and they all contain...

Chondroitin sulfate A was covalently immobilized onto a monolithic silica epoxy column involving Schiff base formation in the presence of ethylenediamine as spacer and evaluated terms its selectivity enantioseparation. The obtained utilized chiral stationary phase enantioseparation amlodipine verapamil using mobile consisting 50 mM phosphate buffer pH 3.5 UV detection. Sample dilution by organi...

This paper reported the enantioseparation of Naproxen, Ketoprofen and Etodolac on tartardiamide-DMB chiral stationary phase (CHI-DMB) and (R,R)-DNB-DPEDA chiral stationary phase,using hexane as the mobile phase with various modifiers. The influence of the mobile phase composition including the type and concentration of the modifiers in hexane and the structures of the analytes on the chiral sep...

Enantioseparation is largely based on the formation of transitional complexes, the solvation species, the stationary phase configurations or the diastereomeric complexes formed by analytes and the chiral stationary phase. Temperature and the chemical nature and composition of the eluent play significant roles during that process. In this study; unique temperature-induced behaviors were observed...