Resveratrol Purification via pH-Dependent Crystallization
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Solution Overview
Problem
Current processes for producing resveratrol are labor-intensive, yield low quantities, and are contaminated with impurities like emodin and polycyclic aromatic hydrocarbons (PAHs), while microbial fermentation methods struggle to remove bisnoryangonin and other color-inducing impurities effectively.
Innovation Solution
A process involving pH adjustment, microbial removal, precipitation, solvent dissolution, and purification with Al2O3 and carbon to crystallize resveratrol, reducing bisnoryangonin and other impurities, achieving higher purity and whiteness indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microbial fermentation is used to produce resveratrol, then production efficiency and yield are improved, but the product contains impurities like bisnoryangonin that are difficult to remove
Solution Approach 1:
The purification process is divided into multiple sequential steps: pH adjustment to separate resveratrol from bisnoryangonin, filtration to remove cell debris, activated carbon treatment to adsorb remaining impurities, and crystallization to obtain pure resveratrol. Each step targets specific impurities, progressively improving purity while maintaining high yield.
Solution Approach 2:
The process exploits pH-dependent solubility differences between resveratrol and bisnoryangonin. By adjusting pH to alkaline conditions (pH 8-10), resveratrol becomes soluble while bisnoryangonin remains insoluble, enabling effective separation. This parameter change resolves the contradiction by providing a simple, high-efficiency separation mechanism.
2Manufacturing precision
If conventional extraction methods are used, then product purity is maintained, but the process is labor-intensive and yield is low
Solution Approach 1:
The fermentation system produces resveratrol autonomously through engineered yeast metabolism, eliminating the need for labor-intensive plant extraction. The yeast cells continuously synthesize resveratrol during fermentation, providing high-yield production without manual harvesting and extraction operations.
Solution Approach 2:
The process utilizes phase transition of resveratrol from dissolved state in alkaline solution to crystalline state during acidification. This phase change enables automatic separation of pure resveratrol crystals from the fermentation broth, providing both high purity and high yield without labor-intensive filtration operations.
3Quantity of substance
If plant extraction is used, then resveratrol can be obtained, but the product is contaminated with emodin and polycyclic aromatic hydrocarbons
Solution Approach 1:
The process extracts resveratrol specifically from fermentation broth while leaving behind plant-derived contaminants. By using microbial fermentation as the source and employing selective purification steps (pH adjustment, activated carbon adsorption), the process obtains resveratrol free from emodin and PAHs that co-exist in plant materials.
Solution Approach 2:
Activated carbon serves as an intermediary substance that selectively adsorbs remaining impurities including traces of bisnoryangonin and other contaminants from the fermentation broth. This intermediary treatment ensures the final product is free from harmful contaminants while maintaining high resveratrol concentration.
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
The process achieves resveratrol with significantly reduced impurities, including bisnoryangonin, resulting in a higher purity product suitable for food and beverage applications, with improved yield and reduced contamination.
Implementation Method 1
increasing the pH of the fermentation broth to about 10 to about 12
Implementation Method 2
decreasing the pH of the substantially microbe free liquid such that crude resveratrol is precipitated
Implementation Method 3
contacting the solution produced in step (e) or step (f) with carbon
Implementation Method 4
crystallizing the purified resveratrol from the purification solvent
Data Source
AI summary
The present invention relates to a process for recovering and purifying resveratrol produced by microbial fermentation. More particularly, the present invention relates to a process for recovering and purifying resveratrol produced by yeast fermentation.