Rapid method development for chiral separation in drug discovery using multi-column parallel screening and circular...

Area of Science:

• Analytical Chemistry
• Chromatography
• Spectroscopy

Background:

• Chiral method development is crucial for separating enantiomers.
• Existing methods for screening chiral stationary phases can be time-consuming.
• Automated sequential screening and coupled column approaches have limitations.

Purpose of the Study:

• To develop a novel strategy for rapid chiral method development.
• To introduce a multi-column parallel screening system for simultaneous analysis of chiral stationary phases.
• To utilize circular dichroism (CD) signal pooling for enantiomer identification.

Main Methods:

• A customized high-performance liquid chromatography (HPLC) system with five parallel channels was developed.
• The system integrated an auto-sampler, one pump, five columns (Chiralpak AD/AS, Chiralcel OJ/OD, Whelk-O1), and five UV detectors.
• Pooled CD signals from five recombined channels were used to track enantiomeric elution order and sign.

Main Results:

• The multi-column system achieved a five-fold increase in speed for chiral column scouting.
• The method effectively screened five different chiral stationary phases in parallel.
• Pooled CD signal analysis successfully tracked enantiomer elution order and determined enantiomeric sign.

Conclusions:

• The developed strategy significantly accelerates chiral method development.
• Parallel screening with CD signal pooling offers an efficient alternative to existing methods.
• This approach overcomes limitations of sequential and coupled column screening methods.