Aurantiochytrium Cultivation with Flash Illumination for DHA Yield
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Solution Overview
Problem
Current methods for producing polyunsaturated fatty acids like DHA and carotenoids, such as astaxanthin and canthaxanthin, from Aurantiochytrium protists face challenges in achieving high yields efficiently and economically, particularly due to limitations in light-dependent growth and substrate utilization in traditional fermentation processes.
Innovation Solution
A method involving the cultivation of Aurantiochytrium protists in mixotrophic mode with discontinuous and variable illumination, combined with continuous organic substrate supply, to enhance biomass yield and accumulation of DHA and carotenoids, utilizing strains like FCC 1324, which are specifically suited for high-yield production under controlled conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional heterotrophic fermentation is used, then biomass production is achieved, but lipid and carotenoid yields remain limited
Solution Approach 1:
The patent applies parameter changes by transitioning from traditional heterotrophic fermentation to mixotrophic cultivation mode, combining organic substrate utilization with light exposure. This fundamental parameter change in cultivation methodology enables simultaneous biomass accumulation and enhanced lipid/carotenoid synthesis, resolving the contradiction between biomass production and product yield
Solution Approach 2:
The invention utilizes the multi-functionality of Aurantiochytrium strains that can perform both heterotrophic growth on organic substrates and photoacclimation responses to light. This dual capability allows the organism to simultaneously produce biomass through substrate consumption and accumulate lipids/carotenoids through light-induced metabolic pathways, thereby improving overall productivity
2Productivity
If continuous light exposure is applied, then photosynthetic activity increases, but energy consumption and operational costs increase
Solution Approach 1:
The patent implements periodic action through flash illumination regimes, where light is provided in intermittent pulses rather than continuous exposure. This periodic light delivery maintains photosynthetic activity and supports growth while significantly reducing overall energy consumption compared to continuous lighting, thus resolving the contradiction between productivity and energy use
Solution Approach 2:
The invention achieves continuity of useful action by combining mixotrophic substrate utilization with periodic light exposure. The organic substrates provide continuous energy and carbon sources for biomass synthesis, while intermittent light pulses continuously stimulate photosynthetic pathways for lipid and carotenoid production, maintaining productivity without requiring constant energy input
3Quantity of substance
If mixotrophic mode with flash illumination is used, then DHA and carotenoid accumulation is enhanced, but process complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the cultivation process into distinct phases: an initial growth phase using organic substrates and a subsequent accumulation phase with flash illumination. This temporal segmentation allows optimization of each phase for its specific purpose (biomass production vs. product accumulation) while using relatively simple, separately-controlled systems for each phase
4Productivity
If high biomass concentration is achieved, then substrate utilization efficiency improves, but light penetration and mass transfer become limiting
Solution Approach 1:
The patent uses periodic flash illumination to overcome light penetration limitations in high-biomass cultures. The intermittent nature of flash lighting creates transient light availability that penetrates deeper into dense cultures before being completely absorbed, allowing effective photosynthesis even at high cell densities where continuous lighting would be completely blocked by the outer layers
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 approach significantly increases the yield of DHA and carotenoids, achieving biomass concentrations greater than 100g/L with DHA representing over 30% of fatty acids and carotenoids present at 0.1% by weight of dry matter, optimizing industrial-scale production by improving productivity and reducing costs.
Implementation Method 1
The invention relates to a method of culturing in mixotrophic mode, in particular in the presence of discontinuous and/or variable illumination of light, of a protist of the class Labyrinthulomycete, especially of the kind Aurantiochytrium
Implementation Method 2
cultivation of Aurantiochytrium protists in mixotrophic mode with discontinuous and variable illumination
Data Source
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AI summary
The invention relates to novel strains of protists belonging to the Aurantiochytrium genus that allow the high yield production of lipids and carotenoids, in particular docosahexaenoic acid (DHA) and canthaxanthin and/or astaxanthin, in mixotrophic mode, in particular, using variable and/or discontinuous provision of light, in particular in the form of flashes.