Microalgae Carbon Source for L-Amino Acid Fermentation
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Solution Overview
Problem
Current methods for producing L-amino acids by fermentation using microorganisms are inefficient and costly, particularly due to the complexity and expense of obtaining carbon sources from higher plants, and the difficulty in utilizing fats and oils from microalgae as direct fermentation substrates.
Innovation Solution
A method involving the use of a processed product from microalgae, obtained by reacting the culture at a mid-temperature, which serves as a carbon source for bacteria to produce L-amino acids, without the need for added lipase or amylase, or with a small amount, thereby simplifying the extraction process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If starches from higher plants (corn, cassava) are used as carbon source, then it is easy to industrially obtain starches with low moisture content and high starch content, but the extraction and purification process is complicated and difficult when using microalgae starches
Solution Approach 1:
The patent changes the physical-chemical parameters of the microalgae cells by subjecting them to high temperature (autoclaving) and alkaline treatment. This transforms the cell structure and starch properties, making them directly fermentable by bacteria without requiring complex mechanical extraction and purification processes. The parameter changes convert the intractable microalgae starch into a form that can be directly utilized as carbon source.
2Quantity of substance
If fats and oils from microalgae are used as carbon source, then the dry weight of algae per weight unit of culture medium does not reach 1%, but Escherichia coli cannot directly assimilate fats and oils due to lack of lipase activity
Solution Approach 1:
The patent introduces an intermediary substance (alkali) that facilitates the conversion of fats and oils into a form that bacteria can assimilate. The alkaline treatment hydrolyzes the triglycerides into fatty acids and glycerol, which then serve as intermediaries that the bacteria can directly utilize as carbon sources. This intermediary transformation resolves the incompatibility between the bacterial metabolic pathways and the fat/oil carbon source.
Solution Approach 2:
The patent applies parameter changes by treating microalgae with alkali and high temperature, which chemically transforms the fats and oils into soluble fatty acids and glycerol. This parameter change in the chemical structure and solubility of the carbon source enables direct bacterial assimilation without requiring additional lipase enzymes.
3Adaptability or versatility
If long chain fatty acids are used as carbon source, then Escherichia coli can grow using them as sole carbon source, but the solubility of long chain fatty acids is extremely low
Solution Approach 1:
The patent uses alkali as an intermediary to convert insoluble long chain fatty acids into water-soluble forms. The alkaline treatment creates soap molecules (fatty acid salts) that act as intermediaries, increasing solubility while maintaining the carbon source functionality. This allows the bacteria to access the carbon in fatty acids without being limited by their low solubility.
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 method enables efficient production of L-amino acids with improved yield and reduced processing time, utilizing microalgae-derived carbon sources, thereby lowering production costs and simplifying the extraction process.
Implementation Method 1
preparing a processed product of a microalga, which promotes production and accumulation of the L-amino acid by a bacterium having an ability to produce the L-amino acid, by culturing the microalga in a first medium, and followed by processing at a mid-temperature
Implementation Method 2
culturing the bacterium in a second medium comprising the processed product of the microalga to produce and accumulate the L-amino acid in the second medium
Data Source
AI summary
A method for producing an L-amino acid by preparing a processed product of a microalgae, which promotes production and accumulation of the L-amino acid by a bacterium having an ability to produce the L-amino acid, by culturing the microalgae in a medium, and processing the resulting culture at a midtemperature; culturing the bacterium in a medium containing the processed product of the microalgae to produce and accumulate the L-amino acid in culture; and collecting the L-amino acid from the culture.