Add time:08/25/2019         Source:sciencedirect.com

Continuous free flow electrophoresis (CFFE) was applied to the preparative chiral separation of Ritalin (cas 113-45-1) enantiomers. Sulfated β-cyclodextrin (sβ-CD) was used as the chiral additive. Liquid chromatography–mass spectrometry (LC–MS) experiments were applied to study the time averaged concentration of sβ-CD in the separation chamber. The distribution of sβ-CD in the separation chamber greatly influenced resolution and the angle of deflection. To optimize the separation, several parameters (methanol, concentration of sβ-CD in the cathodic wash and in the separation buffer, and the introduction of a low conductivity zone) were investigated. The dependence of the resolution and deflection angles of ritalin enantiomers on the concentration of sβ-CD in both the separation buffer and in the cathode wash solution appeared to be non-linear. Under close to optimal conditions, resolution of ritalin enantiomers was about 0.8 with an average processing rate of 0.5 mg/h. Overall, the enantiomeric purity of the individual isomers was ∼83%; however, of the 20 vials containing ritalin, the presence of both enantiomers was only detected in three vials.

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