A strategy to process hundred-gram level complex sample using liquid-liquid-refining extraction and consecutive...

Area of Science:

• Natural Product Chemistry
• Separation Science
• Phytochemistry

Background:

• Large-scale isolation of target compounds from complex natural sources presents significant challenges.
• Toona sinensis is a valuable plant source, but efficient extraction of its active components is difficult.
• Developing scalable and efficient purification methods is crucial for natural product utilization.

Purpose of the Study:

• To develop and validate an efficient strategy for the large-scale preparation of target compounds from complex plant extracts.
• To optimize a combined liquid-liquid refining extraction (LLRE) and high-speed counter-current chromatography (HSCCC) method for purifying active components from Toona sinensis.
• To isolate ethyl gallate from Toona sinensis crude extracts with high purity and yield.

Main Methods:

• Utilized liquid-liquid refining extraction (LLRE) to remove impurities from 100 g of Toona sinensis crude extracts, yielding 9.25 g of pretreated sample.
• Employed high-speed counter-current chromatography (HSCCC) with a n-hexane-ethyl acetate-methanol-water solvent system (2.5:5:2.5:5, v/v) for purification.
• Investigated isocratic elution with maximum loading and consecutive injection modes for enhanced compound recovery.

Main Results:

• Successfully isolated ethyl gallate with 97% purity from Toona sinensis using HSCCC.
• Achieved a final yield of 3.73 g of ethyl gallate from 9.25 g of pretreated crude sample.
• Demonstrated a significant increase in yield efficiency, from 0.26 g/h/L for untreated extract to 1.62 g/h/L with the optimized consecutive injection HSCCC method.

Conclusions:

• The combined LLRE and consecutive HSCCC strategy is highly effective for the large-scale preparation of target compounds from complex plant matrices.
• This method significantly improves purification efficiency and yield compared to traditional approaches.
• The developed protocol offers a scalable and robust solution for isolating valuable compounds like ethyl gallate from natural resources.