An alternative procedure to screen mixture combinatorial libraries for selectors for chiral chromatography.

Area of Science:

• Analytical Chemistry
• Separation Science
• Chromatography

Background:

• Chiral chromatography is crucial for separating enantiomers.
• Identifying effective chiral selectors is often a laborious process.
• Existing methods require extensive synthesis and screening of libraries.

Purpose of the Study:

• To develop a more efficient screening method for identifying chiral selectors from mixture libraries.
• To reduce the need for multiple library syntheses in selector discovery.
• To enable the screening of larger libraries for potential chiral selectors.

Main Methods:

• Immobilizing individual enantiomers of a target analyte onto silica gel.
• Incubating mixture libraries with the enantiomer-functionalized stationary phases.
• Analyzing adsorbed library components using reversed-phase liquid chromatography (RPLC).
• Comparing chromatograms to identify components with differential binding (chiral selectors).
• Determining the chemical structure of identified selectors using LC-MS or LC-MS-MS.

Main Results:

• A novel screening process for chiral selector identification was successfully established.
• The method allows for direct comparison of library binding to enantiomer-specific stationary phases.
• Differential peak intensities in RPLC chromatograms reliably indicate chiral selector candidates.
• The efficiency of chiral selector determination is significantly increased compared to previous methods.
• The technique facilitates the screening of larger and more diverse chemical libraries.

Conclusions:

• The described method offers a highly efficient and streamlined approach to chiral selector discovery.
• This technique reduces synthetic effort and expands the scope of library screening for chiral applications.
• The process is valuable for advancing the development of new chiral stationary phases for chromatography.