A multi-dimensional multi-mode multi-column preparative chromatography strategy for systematic purification of...

Area of Science:

• Natural Product Chemistry
• Analytical Chemistry
• Pharmacognosy

Background:

• Natural products are vital in drug discovery, with alkaloids being particularly promising leads.
• Efficient purification of complex alkaloid mixtures is crucial for identifying new drug candidates.

Purpose of the Study:

• To develop and validate a novel multi-dimensional, multi-mode, multi-column (3M) preparative chromatography strategy for the effective purification of alkaloids.
• To demonstrate the resolving power and efficiency of the 3M strategy for alkaloid isolation from a complex natural source.

Main Methods:

• Development of a 3M preparative chromatography strategy integrating diverse separation modes, stationary phases, and mobile phase conditions for high orthogonality.
• Application of the 3M strategy to crude alkaloids from Menispermum dauricum DC for method validation and compound isolation.
• Characterization of purified compounds and assessment of the method's predictive capacity for larger-scale isolations.

Main Results:

• Successful purification of 81 alkaloids from 13.7 kg of M. dauricum using the 3M strategy.
• Identification of 37 novel alkaloid compounds, including 7 with previously unreported scaffolds.
• Demonstration of significant resolving power, with a prediction of isolating 445 compounds (>2 mg each) from 100 kg of M. dauricum.

Conclusions:

• The 3M preparative chromatography strategy is highly effective and rational for the efficient purification of alkaloids.
• This method significantly enhances the discovery of novel alkaloids and accelerates drug lead identification.
• The 3M strategy offers a powerful tool for natural product chemists and the pharmaceutical industry.