Chromatographic PUFA Purification via Gradient Elution and Stream Recycling
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Solution Overview
Problem
Current chromatographic processes for purifying polyunsaturated fatty acids (PUFAs) face challenges in achieving high purity levels due to dilution of purified fractions and the fragility of PUFAs, which are prone to oxidation and degradation, and require significant solvent use.
Innovation Solution
A process involving chromatographic separation using an aqueous organic eluent, followed by concentration and recycling of depleted streams to reduce solvent consumption and minimize contamination from undesirable fatty acids, with options for adjusting the water-to-organic ratio in recycled streams and utilizing recycled eluents in upstream separation steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chromatographic separation is performed using conventional eluents, then PUFAs can be separated from the feed mixture, but the purified fractions become diluted and require significant solvent use
Solution Approach 1:
The patent applies parameter changes by modifying the eluent composition through a gradient approach, starting with high water content (50-95% water) for initial separation and progressively reducing water content to 0-50% water for concentration and elution steps. This dynamic adjustment of eluent parameters enables both effective separation and concentration of PUFAs while minimizing solvent consumption and avoiding dilution of purified fractions.
2Manufacturing precision
If conventional chromatographic processes are used, then PUFAs can be purified, but the process requires multiple chromatographic steps to reach high purities
Solution Approach 1:
The patent implements continuity of useful action by designing a continuous chromatographic process where the eluent gradient progresses continuously from high water content to low water content through different zones or stages within a single chromatographic system. This continuous action achieves high PUFA purity in one integrated process rather than requiring multiple discrete chromatographic steps, thereby reducing device complexity while maintaining manufacturing precision.
3Manufacturing precision
If PUFAs are subjected to conventional purification processes including heating, then separation can be achieved, but PUFAs undergo oxidation, degradation, isomerization, peroxidation and oligomerization
Solution Approach 1:
The patent creates an inert environment by using aqueous eluents with high water content and controlling the chromatographic conditions to minimize exposure of PUFAs to oxygen and heat. The gradient elution process progresses rapidly through different solvent compositions, reducing the time PUFAs are vulnerable to oxidation and degradation. This inert-like environment protection enables effective separation while preventing harmful chemical reactions.
4Manufacturing precision
If multiple chromatographic steps are performed to achieve high purity, then PUFA purity increases, but process time and complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the chromatographic process into distinct functional zones or stages within a single continuous operation: an initial separation zone with high water content eluent, a transition zone with gradient elution, and a final concentration/elution zone with low water content eluent. This segmentation allows multiple separation functions to be performed simultaneously in different zones, achieving high PUFA purity in one continuous process rather than requiring multiple sequential steps, thereby reducing process time while maintaining manufacturing precision.
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 enhances the purity of PUFAs by reducing solvent usage and preventing contamination, allowing for the production of highly purified PUFAs with reduced levels of impurities, such as DHA in EPA compositions, while maintaining process efficiency.
Implementation Method 1
performing a main step of chromatographic separation using an aqueous organic eluent and thereby collecting a first stream of eluent enriched in the first polyunsaturated fatty acid and a second distinct stream of eluent enriched in the second fatty acid
Implementation Method 2
subjecting the second stream of eluent to a concentrating step so as to obtain a concentrated portion of the second stream comprising concentrated fatty acids
Data Source
AI summary
A process is provided for recovering a first polyunsaturated fatty acid (PUFA) from a feed mixture including at least one additional fatty acid (e.g., a second fatty acid (FA)). The process optionally comprises:performing a main step of chromatographic separation using an aqueous organic eluent and collecting a first stream of eluent enriched in the first PUFA and a second stream of eluent enriched in the second FA;subjecting the second stream of eluent to a concentration step to obtain a concentrated portion including the second FA, and a depleted portion comprising eluent, but depleted of the second FA. The water-to-organic ratio of the depleted portion is lower than the water-to-organic ratio of the second stream of eluent. The process also includes:at least partially recycling the depleted portion for use in the main step of chromatographic separation.