Fermentation Process for Retinyl Acetate Purity
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Solution Overview
Problem
Current chemical production methods for retinoids, such as vitamin A, face challenges including high-energy consumption, complex purification steps, and the production of undesirable by-products like fatty acid retinyl esters, which limit large-scale industrial production.
Innovation Solution
A novel process involving fermentation of oleaginous yeast cells, such as Yarrowia, in the presence of ethanol during a fed-batch fermentation process, which reduces or abolishes the formation of by-products like fatty acid retinyl esters and increases the production of retinyl acetate, improving purity and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If oleaginous host cells are grown on vegetable oils or glucose as carbon source, then retinoid production occurs, but fatty acid retinyl esters (FAREs) are produced as unwanted by-products that are difficult to purify
Solution Approach 1:
The patent changes the carbon source parameter from vegetable oils or glucose to ethanol, which fundamentally alters the metabolic pathway of the oleaginous host cell. This parameter change prevents the formation of FAREs by eliminating the fatty acid pathway that reacts with retinyl groups, while still allowing retinoid production through ethanol metabolism.
2Quantity of substance
If highly specific acetylating enzymes (ATFs) are expressed in the host cell, then retinyl acetate accumulation increases, but retinol is still converted into undesired side-products including FAREs
Solution Approach 1:
The patent extracts or removes the problematic fatty acid pathway from the system by using ethanol as carbon source instead of vegetable oils. This eliminates the source of fatty acids that would otherwise react with retinyl groups to form FAREs, while preserving the acetylating enzyme pathway for retinyl acetate production.
3Productivity
If FAREs are produced at high concentrations, then retinoid production is high, but large scale industrial production of pure products is limited due to purification difficulties
Solution Approach 1:
The patent changes the carbon source parameter to ethanol, which fundamentally alters the product profile by eliminating FARE formation. This enables high-volume production of pure retinyl acetate that can be easily crystallized and purified, removing the bottleneck that limited large-scale industrial production.
4Productivity
If chemical production methods are used for retinoids, then production capacity is sufficient, but high-energy consumption and complicated purification steps are required
Solution Approach 1:
The patent employs oleaginous host cells that naturally possess the metabolic machinery to produce retinoids through fermentation. The biological system performs the synthesis and selective acetylation self-services, eliminating the need for energy-intensive chemical synthesis steps and complex purification processes required by conventional chemical methods.
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 process significantly reduces the formation of unwanted by-products by 50-100% and increases retinyl acetate production by 25-100% compared to fermentation with triglycerides, enhancing the feasibility of large-scale industrial production of pure retinyl acetate.
Implementation Method 1
fermentation in the presence of ethanol, particularly in a fed-batch fermentation process
Data Source
AI summary
The present invention is related to a novel process for production of retinyl acetate in a host cell, particularly oleaginous yeast such as e.g. Yarrowia, wherein the product purity could be increased with reduction of unwanted side- products. Particularly, the novel process comprises fermentation in the presence of ethanol, such as e.g. in a fed-batch fermentation process. Such process is especially useful in a biotechnological process for production of vitamin A.