Orthogonal analytical screening for liquid chromatography-mass spectrometry method development and preparative...

Area of Science:

• Medicinal Chemistry
• Analytical Chemistry
• Separation Science

Background:

• Preparative High-Performance Liquid Chromatography-Mass Spectrometry (RP-HPLC-MS) is crucial for purifying compounds in medicinal chemistry.
• Existing methods for optimizing analytical separations do not adequately address the specific needs for preparative purification optimization.
• There is a need for a robust screening methodology to enhance the efficiency and success rate of preparative RP-HPLC-MS purifications.

Purpose of the Study:

• To develop and validate a novel analytical HPLC-MS screening methodology.
• To optimize preparative RP-HPLC-MS purifications by systematically evaluating orthogonal separation conditions.
• To provide a practical tool for medicinal chemists to improve compound purification processes.

Main Methods:

• Development of an analytical HPLC-MS screening protocol utilizing orthogonal conditions.
• Systematic variation of five different buffer conditions (pH range), two organic solvents (acetonitrile, methanol), and five stationary phases.
• Modification of an analytical 'open access' HPLC-MS system for screening purposes while retaining its original functionality.
• Development of a software tool for automated sample programming and data reporting.

Main Results:

• Demonstration of the system's orthogonality using both standard mixtures and synthetic compound mixtures.
• Successful implementation of the screening protocol on a modified analytical HPLC-MS system.
• Development of automated software facilitating efficient screening and data analysis.

Conclusions:

• The developed analytical HPLC-MS screening methodology effectively improves preparative RP-HPLC-MS purifications.
• The protocol's systematic approach using orthogonal conditions allows for the identification of optimal preparative separation parameters.
• The integrated software tool enhances the usability and efficiency of the screening process in medicinal chemistry laboratories.