A novel method for characterization and comparison of reversed-phase column selectivity

Area of Science:

• Analytical Chemistry
• Chromatography

Background:

• Selecting the right reversed-phase column is crucial for effective chromatography.
• Existing methods for column characterization can be limited.

Purpose of the Study:

• To develop and validate a novel method for characterizing and comparing reversed-phase column selectivity.
• To provide a visual tool for chromatographers to select columns with desired selectivity.

Main Methods:

• Utilized linear solvation energy relationships (LSERs) combined with fundamental retention equations.
• Determined retention times for 25 solutes across 12 reversed-phase columns using gradient elution.
• Employed multiple linear regression to derive LSER equations based on predicted retention factors.

Main Results:

• Accurate determination of solute retention times in gradient elution, avoiding extreme analysis times.
• LSER coefficients derived from retention factors at 0% organic modifier effectively reflected column properties.
• Angle and spider diagrams based on solvation energy vectors provided visual comparisons of column selectivity.

Conclusions:

• The developed LSER-based method accurately characterizes reversed-phase column selectivity.
• Visual tools like angle and spider diagrams facilitate informed column selection.
• The method was successfully applied to separate components in Psoralea corylifolia extraction.