Fermentation Medium Sulfate Control for PUFA Biomass Disruption
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Solution Overview
Problem
Existing methods for producing biomass with high polyunsaturated fatty acid (PUFA) content face challenges due to high chloride content causing corrosion in steel bioreactors and high sulfate content leading to stable cell walls that hinder oil release, resulting in limited PUFA content and difficulty in oil extraction.
Innovation Solution
A process involving culturing PUFAs-producing cells in a fermentation medium with a sulfate content that decreases to zero in the last phase of fermentation, optimizing biomass density and lipid accumulation, and using low mechanical forces for cell disruption, allowing for increased PUFA content and facilitated oil release without corrosion issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high sulfate content is used in fermentation medium, then cell wall stability is improved, but oil release from cells becomes difficult
Solution Approach 1:
The patent applies periodic action by varying sulfate concentration in two distinct phases: during the growth phase, sulfate is present to stabilize cell walls and promote biomass accumulation; during the production phase, sulfate is limited or eliminated to facilitate oil release. This temporal variation in sulfate concentration resolves the contradiction between cell wall stability and oil release ease.
Solution Approach 2:
The patent implements dynamics by making the sulfate concentration adjustable and variable throughout the fermentation process. The system transitions from a sulfate-rich environment during growth to a sulfate-limited or sulfate-free environment during production, allowing the cell wall properties to dynamically adapt to the process requirements at each stage.
2Productivity
If high chloride content is used in fermentation medium, then initial microalgae growth is supported, but corrosion of steel bioreactors occurs
Solution Approach 1:
The patent applies parameter changes by substituting the chemical composition of the fermentation medium, specifically replacing chloride-based compounds with sulfate-based compounds. This parameter change maintains the ability to support microalgae growth and PUFA production while eliminating the corrosive effect on steel bioreactors.
3Quantity of substance
If sulfate content is limited to increase PUFA proportion, then PUFA content increases, but cell wall becomes too unstable for practical handling
Solution Approach 1:
The patent uses periodic action by implementing distinct growth and production phases with different sulfate concentrations. During the growth phase, sufficient sulfate is provided to maintain cell wall stability and enable biomass accumulation. During the production phase, sulfate is limited to shift metabolism toward PUFA accumulation. This temporal separation allows both high PUFA content and adequate cell wall stability to be achieved.
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 achieves a biomass with a higher mass proportion of PUFAs and facilitates oil release with reduced mechanical effort, while using a non-corrosive fermentation medium, resulting in a stable yet easily disruptable cell wall.
Implementation Method 1
In the subsequent oil-production phase, which is generally introduced by specific measures, is predominantly oil production by the cells of the biomass, with the growth of the cells being stopped at least as far as possible. This means that, in the oil-production phase, the increase in biomass is at least primarily attributable not to an increase in cell count, but to the accumulation of lipids in the cell interior of the cells present.
Implementation Method 2
Processes for producing biomass containing polyunsaturated fatty acids (PUFAs) have already been described in the prior art. What are frequently used here are the Labyrinthulomycetes, which naturally accumulate polyunsaturated fatty acids as storage lipids in a relatively large amount in the cell.
Data Source
AI summary
According to the invention, it has been found that when the amount of sulfate used in the culturing of PUFAs-producing cells is selected such that the sulfate concentration drops to zero in the last phase of the growth phase of the cells, an easily disruptable biomass is obtained which has an increased proportion by mass of polyunsaturated fatty acids (PUFAs) in the final product.