Knotwood Extract Purification via Liquid-Liquid Extraction
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Solution Overview
Problem
Existing methods for extracting hydrophilic compounds from knotwood, such as those used in coniferous trees, often result in impure extracts due to the presence of lipophilic components like resin acids, which can limit their use in industries like cosmetics and pharmaceuticals, necessitating a more effective purification process.
Innovation Solution
A method involving initial extraction of knotwood with a hydrophilic solvent followed by liquid-liquid extraction with a lipophilic solvent to separate and purify hydrophilic components, reducing impurity levels to less than 10% and increasing the concentration of lignans, flavonoids, and stilbenes to over 90%, using solvents like ethanol and heptane with controlled water content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hydrophilic extraction is performed with ethanol/water, then hydrophilic components are extracted, but lipophilic impurities remain in the extract
Solution Approach 1:
The extraction process is divided into two sequential stages: first hydrophilic extraction with ethanol/water to obtain hydrophilic components, then lipophilic extraction with hexane to remove lipophilic impurities. This segmentation allows selective recovery of different compound types while maintaining high purity of the final hydrophilic extract.
Solution Approach 2:
The patent applies a second extraction step using a lipophilic solvent (hexane) to selectively extract and remove lipophilic impurities from the hydrophilic extract. This 'taking out' operation separates the harmful lipophilic components from the desired hydrophilic components, achieving high purity while preserving the quantity of useful substances.
2Manufacturing precision
If sequential extraction with lipophilic then hydrophilic solvent is used, then lipophilic components are removed, but hydrophilic components are also lost
Solution Approach 1:
The patent inverts the conventional sequential extraction order by performing hydrophilic extraction first to capture the desired components, then lipophilic extraction second to remove impurities. This reversed sequence ensures that hydrophilic components are already in the extract before lipophilic solvents are applied, preventing their loss while achieving high purity.
3Manufacturing precision
If chromatography or crystallization is used for purification, then extract purity increases, but process complexity and cost increase
Solution Approach 1:
The patent changes the physical-chemical parameters of the extraction system by using a lipophilic solvent (hexane) with different solubility characteristics to selectively remove lipophilic impurities. This parameter change enables simple liquid-liquid extraction without requiring complex chromatographic or crystallization equipment, achieving high purity through solvent selection alone.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process effectively purifies knotwood extracts by removing lipophilic impurities, enhancing their quality and making them suitable for various industrial applications by achieving high purity levels of lignans, flavonoids, and stilbenes, while also allowing for the recovery of lipophilic components.
Implementation Method 1
The resulting knotwood extract is extracted with a lipophilic solvent in a liquid-liquid extraction
Data Source
Figure 1
AI summary
The invention relates to a method for the fractionation of knotwood extract, which has been obtained by extraction of knotwood with a hydrophilic solvent. The hydrophilic extract is extracted with a lipophilic solvent to remove lipophilic impurities. The invention also relates to the use of a liquid-liquid extraction for the purification of hydrophilic knotwood extract. The present process provides a purified knotwood extract, which contains more than 90 % lignans, flavonoids and stilbenes and less than 10 % impurities selected from resin acids, fatty acids, sterols, juvabiones, triglycerides and combinations thereof.