Operating mode and parameter selection in liquid-liquid chromatography.

Area of Science:

• Chromatography
• Separation Science
• Analytical Chemistry

Background:

• Liquid-liquid chromatography (LLC) utilizes a liquid stationary phase, offering high operational versatility and adaptability.
• LLC, encompassing countercurrent chromatography (CCC) and centrifugal partition chromatography (CPC), presents numerous operating modes distinct from conventional liquid-solid chromatography.
• Despite potential performance enhancements over standard modes, alternative LLC operating modes remain underutilized in scientific literature.

Purpose of the Study:

• To provide a comprehensive overview of available LLC operating modes.
• To identify key characteristics, advantages, disadvantages, and applications of each operating mode.
• To offer clear guidelines and methods for selecting operating modes and parameters in LLC.

Main Methods:

• Review of existing literature on liquid-liquid chromatography operating modes.
• Analysis and comparison of different LLC operational strategies.
• Presentation and critique of equations and models for operating mode and parameter selection.

Main Results:

• Detailed characterization of various LLC operating modes, including their pros and cons.
• Unified notation and presentation of selection models for improved clarity.
• Identification of factors contributing to the underutilization of alternative LLC modes.

Conclusions:

• Accessible guidelines for LLC operating mode and parameter selection can increase technology adoption.
• Standardized methods will help users leverage the full potential of LLC, CCC, and CPC.
• Expanded application of LLC is expected through better understanding and accessibility of its diverse operating modes.