Mutant Partial Glyceride Lipase for PUFA Deacidification
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Solution Overview
Problem
Existing enzymatic deacidification techniques for PUFA-rich lipids have low catalytic efficiency and high side reaction rates due to the use of triglyceride lipases, which results in poor deacidification of long-chain polyunsaturated fatty acids like EPA and DHA, and generates by-products and neutral oil consumption.
Innovation Solution
A mutant partial glyceride lipase, Lipase SMG1 Phe278Asn, is used as a catalyst for esterification reactions with short-chain monols in a solvent system, avoiding side reactions with triglycerides and improving selectivity for long-chain polyunsaturated fatty acids, with immobilization using epoxy resin and specific reaction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If triglyceride lipase is used as catalyst for enzymatic deacidification, then the deacidification process can be carried out under mild conditions, but side reactions occur between triglyceride and hydroxyl donor reducing product yield
Solution Approach 1:
The patent applies local quality by creating a lipase enzyme with altered substrate specificity through site-directed mutagenesis. The mutant lipase selectively recognizes and acts on long-chain polyunsaturated fatty acids while excluding triglycerides, achieving local specificity enhancement at the molecular level. This resolves the contradiction by enabling high deacidification efficiency for target substrates without triggering side reactions with triglycerides.
Solution Approach 2:
The patent changes the biochemical parameters of the lipase enzyme through genetic mutation (Phe278Asn substitution), altering its catalytic properties. The mutant enzyme exhibits modified substrate binding characteristics that preferentially catalyze esterification of long-chain PUFAs while rejecting triglycerides, thus achieving high productivity without side reactions.
2Productivity
If conventional lipase is used, then general esterification can occur, but catalytic efficiency for long-chain polyunsaturated fatty acids is low
Solution Approach 1:
The patent enhances local quality by engineering the lipase active site through mutagenesis to specifically recognize long-chain polyunsaturated fatty acids. The mutant enzyme displays heightened catalytic efficiency for EPA and DHA substrates while maintaining exclusion of other substrates, achieving both high productivity and reliability simultaneously.
Solution Approach 2:
Instead of attempting to make the enzyme accept all substrates and then selecting the desired reaction, the patent inverts the approach by engineering the enzyme to specifically reject unwanted substrates (triglycerides) while accepting only the desired substrate (long-chain PUFAs). This inverted selectivity strategy achieves both high catalytic efficiency and substrate specificity.
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 method achieves a removal rate of free fatty acids exceeding 99% with minimal oxidation of PUFAs, maintaining high substrate specificity and allowing for repeated use of the immobilized enzyme without significant activity reduction.
Implementation Method 1
A mutant partial glyceride lipase, Lipase SMG1 Phe278Asn, is used as a catalyst for esterification reactions with short-chain monols
Implementation Method 2
utilizes the high efficiency and specificity of the enzymatic reaction to perform esterification and deacidification
Implementation Method 3
with immobilization using epoxy resin and specific reaction conditions
Data Source
AI summary
An enzymatic deacidification method for partial glyceride lipase and PUFA-rich oil, comprising the following steps: 1) mixing a polyunsaturated fatty acid (PUFA)-rich oil with a non-polar organic solvent and a short-chain monohydric alcohol, adding an immobilized partial glyceride lipase to carry out an esterification reaction, wherein the partial glyceride lipase is a mutant obtained by mutating the Phe at the 278th position of Lipase SMG1 as Asn; 2) recovering the immobilized enzyme, and recovering the organic solvent and the monohydric alcohol so as to obtain a deacidified PUFA-rich oil. The partial glyceride lipase does not catalyze alcoholysis of triglyceride and like side reactions, has high deacidification efficiency, low reaction temperature, prevents high temperature oxidation of PUFAs, and the immobilized enzyme may be recovered and reused repeatedly, and thus the present invention has good application prospects in industry.