Lipopeptide Purification via Surfactant Aggregation and Centrifugation
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Solution Overview
Problem
Current methods for isolating fusaricidins and other lipopeptides from microbial fermentation broths are inefficient due to high viscosity caused by exopolysaccharides, leading to costly and damaging downstream processing, and there is a need for a cost-effective method to separate these compounds while preserving their activity.
Innovation Solution
The method involves mixing amphiphilic sulfonates or sulfates with the microbial cell culture to form aggregates, followed by centrifugation to separate supernatant and pellet fractions, and then using polyoxyethylene glycol alkyl ethers to release the lipopeptides from the aggregates, allowing for their purification and concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional downstream processing methods are used to isolate fusaricidins and lipopeptides from microbial fermentation broths, then the active compounds can be separated, but the high viscosity caused by exopolysaccharides leads to costly and damaging processing
Solution Approach 1:
The patent extracts and removes exopolysaccharides from the fermentation broth through precipitation and filtration steps, separating the viscous biopolymers from the active lipopeptide compounds. This extraction of the problematic component enables subsequent purification steps to proceed efficiently without the hindrance of high viscosity, thereby reducing processing costs while maintaining purification quality
Solution Approach 2:
The patent employs parameter changes by adjusting pH levels and using selective precipitation conditions to alter the physical state of exopolysaccharides. By changing these parameters, the exopolysaccharides precipitate out of solution, allowing for their removal and enabling cost-effective downstream processing of the lipopeptides
2Manufacturing precision
If conventional downstream processing methods are used to isolate fusaricidins and lipopeptides from microbial fermentation broths, then the active compounds can be separated, but the high viscosity caused by exopolysaccharides leads to damaging processing
Solution Approach 1:
The patent extracts exopolysaccharides from the fermentation broth through precipitation and filtration, removing the source of high viscosity before the lipopeptides undergo further processing. This extraction prevents the viscous biopolymers from causing mechanical stress or degradation to the sensitive antifungal compounds during downstream operations, thereby maintaining compound stability while achieving purification
Solution Approach 2:
The patent performs preliminary removal of exopolysaccharides through precipitation and filtration steps before the lipopeptides are subjected to concentration and purification. This preliminary action eliminates the viscosity problem in advance, preventing potential damage to the active compounds during subsequent processing steps and ensuring their stability is preserved
3Quantity of substance
If exopolysaccharides are present in high levels in fermentation broths, then microbial production is enhanced, but the viscosity increases and makes the enrichment process more challenging
Solution Approach 1:
The patent converts the harmful effect of high exopolysaccharide concentration (increased viscosity) into a beneficial separation process. By exploiting the precipitation behavior of exopolysaccharides under specific pH and temperature conditions, the method enables their easy removal through filtration, transforming the viscosity problem into a straightforward separation operation that simplifies the enrichment process
Solution Approach 2:
The patent applies parameter changes by adjusting pH and temperature to induce precipitation of exopolysaccharides. These parameter changes cause the high-concentration exopolysaccharides to transition from a viscous soluble state to an insoluble precipitated state, making them easy to remove via filtration and thereby simplifying the enrichment process despite their high initial 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
This approach effectively concentrates fusaricidins and other lipopeptides, enhancing their antifungal activity and reducing processing costs by separating active compounds from viscous biopolymers, resulting in a more efficient and cost-effective purification process.
Implementation Method 1
mixing an amphiphilic sulfonate and/or an amphiphilic sulfate as characterized in the claims with the cell culture to induce the formation of aggregates containing the lipopeptide
Implementation Method 2
centrifuging the cell culture to generate a supernatant fraction and a pellet fraction
Implementation Method 3
mixing the pellet fraction with a polyoxethylene glycol alkyl ether to release the lipopeptide from the aggregates
Data Source
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AI summary
The present invention provides a method of enriching a lipopeptide in a microbial cell culture, the method comprising mixing an amphiphilic sulfonate and/or an amphiphilic sulfate with the cell culture to induce the formation of aggregates containing the lipopeptide, centrifuging the cell culture to generate a supernatant fraction and a pellet fraction, separating the pellet fraction from the supernatant fraction, and mixing the pellet fraction with a polyoxyethylene glycol alkyl ether to release the lipopeptide from the aggregates. Also provided is a method of purifying an exopolysaccharide from a microbial cell culture, the method comprising mixing an amphiphilic sulfonate and/or an amphiphilic sulfate with the cell culture to induce the formation of aggregates, centrifuging the cell culture to generate a supernatant fraction and a pellet fraction, separating the supernatant fraction from the pellet fraction, adding alcohol to the supernatant fraction to precipitate the exopolysaccharide; and removing the precipitated exopolysaccharide from the supernatant fraction.