Lithium Salt Precipitation for LC-MUFA Separation
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Solution Overview
Problem
Existing methods struggle to efficiently separate long-chain monounsaturated fatty acids (LC-MUFAs) from long-chain polyunsaturated fatty acids (LC-PUFAs) in fish oil, as they often result in incomplete separation due to enzymatic competition and high costs associated with fractionation processes like urea fractionation.
Innovation Solution
A method involving the use of lithium salts in combination with organic solvents such as ethanol and/or acetone to precipitate LC-MUFAs, allowing for their separation from LC-PUFAs by forming a precipitate that can be filtered and purified, resulting in an enriched composition of at least 70% LC-MUFAs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional separation methods are used to separate LC-MUFAs from LC-PUFAs, then some separation is achieved, but the separation is incomplete and costs are high
Solution Approach 1:
The patent changes the physical-chemical parameters of the fatty acid mixture by adjusting temperature, pH, and solvent composition during the fractionation process. These parameter changes enable selective precipitation of LC-MUFAs at different stages, achieving complete separation from LC-PUFAs while controlling process costs through optimized parameter selection
Solution Approach 2:
The patent introduces intermediate fractions during the fractionation process - specifically, a first fraction containing saturated fatty acids removed at higher temperatures, and a second fraction containing LC-MUFAs precipitated at lower temperatures. These intermediate separations act as mediators to achieve complete final separation while managing process complexity and cost
2Quantity of substance
If higher concentrations of LC-MUFAs are produced, then health benefits are improved, but separation from LC-PUFAs becomes more difficult
Solution Approach 1:
The patent segments the fatty acid separation into multiple distinct stages: first removing saturated fatty acids at higher temperatures (40-80°C), then precipitating LC-MUFAs at lower temperatures (-20 to 10°C), and finally obtaining high-purity LC-MUFA fractions. This segmentation allows each stage to target specific fatty acid types, achieving high LC-MUFA concentration (70% or more) while managing separation difficulty through staged processing
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 effectively separates and purifies LC-MUFAs, achieving concentrations of 70% or higher, while also enabling the recovery of concentrated LC-PUFAs, thus overcoming the limitations of previous separation methods.
Implementation Method 1
Mixing an oil composition comprising 5% by weight or more C20-C22 long chain polyunsaturated fatty acids and at least 15% by weight C20-C22 long chain monounsaturated fatty acids with (i) an organic solvent selected from the group consisting of C1-C5 alcohols and ketones of the formula R1(C=0)R2 wherein R1 and R2 are each independently C1-C5 alkyl; and (ii) a lithium salt to form a mixed composition comprising the lithium salts of long chain monounsaturated fatty acids and the lithium salts of the long chain polyunsaturated fatty acids
Implementation Method 2
Reducing the temperature of the mixed composition formed in step a) such that the lithium salts of the long chain monounsaturated fatty acids form a precipitate
Data Source
AI summary
In one aspect, the present invention is directed to a method for obtaining an enriched composition of long chain monounsaturated fatty acids from an oil composition, typically a fish oil composition, comprising both long chain monounsaturated fatty acids and long chain polyunsaturated fatty acids. In another aspect, the present invention is directed to a composition comprising at least 70% by weight of long chain monounsaturated fatty acids.