Nitzschia laevis Fermentation for Fucoxanthin Production
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Solution Overview
Problem
Current methods for producing fucoxanthin from Nitzschia laevis have limitations in cell density and fucoxanthin content, particularly under heterotrophic culture conditions, which restricts industrial application and efficiency.
Innovation Solution
A fermentation method involving fed-batch nutrient components during aeration culture, followed by light induction in a photobioreactor to enhance cell density and fucoxanthin content, utilizing specific light qualities and nutrient ratios to optimize productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If heterotrophic culture is used to increase cell density, then cell density is improved, but fucoxanthin content in cells decreases
Solution Approach 1:
The culture process is divided into two distinct phases: a heterotrophic culture phase for maximizing cell density, followed by a phototrophic induction phase for maximizing fucoxanthin content. This segmentation allows each phase to be optimized independently for its specific objective.
Solution Approach 2:
The culture conditions are dynamically changed between the two phases: transitioning from dark heterotrophic conditions to light-induced phototrophic conditions. This dynamic adjustment of environmental parameters (light/dark, carbon source type) enables the cells to adapt their metabolic pathways to achieve both high cell density and high fucoxanthin content.
2Manufacturing precision
If autophototrophic culture is used to maintain high fucoxanthin content, then fucoxanthin content is improved, but cell density decreases
Solution Approach 1:
A heterotrophic culture phase is performed as a preliminary step before the phototrophic induction phase. This preliminary action builds up a high cell density population that will serve as the foundation for subsequent fucoxanthin accumulation, avoiding the need to start from low cell density in the light phase.
3Manufacturing precision
If continuous monochromatic light irradiation is used, then fucoxanthin accumulation is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous monochromatic light irradiation, the patent employs periodic or intermittent light exposure during the induction phase. This periodic action maintains sufficient fucoxanthin accumulation while reducing overall energy consumption compared to continuous irradiation.
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 significantly higher cell density and fucoxanthin productivity, up to 17.25 g/L cell density and 16.5 mg/(L·d productivity, with fucoxanthin content reaching 1.19% dry weight, surpassing previous records and enabling more efficient industrial production.
Implementation Method 1
Nitzschia laevis, a unicellular plant, contained a fucoxanthin content of up to 1.38% (of dry cell weight) with autophototrophic culture
Implementation Method 2
The applicant's previous research found that the Nitzschia laevis had the highest fucoxanthin productivity of 9.88 mg/(L·d), and could be cultured heterotrophically without light
Data Source
AI summary
The invention discloses a fermentation method for production of fucoxanthin by Nitzschia laevis, including the following steps of: step A, preparation of inocula; step B, fermentation culture: inoculating of Nitzschia laevis according to a certain volume ratio to reaction kettle containing sterile fermentation medium for aeration fermentation, preparing fucoxanthin fermentation broth through culture mean of fed-batch nutrient components; step C, obtaining high fucoxanthin induction culture solution by aeration induction culture under irradiation of monochromatic light or mixed light; extracting fucoxanthin from high fucoxanthin induction culture solution. The invention optimized fermentation condition by fed-batch nutrient components during aeration culture of alga Nitzschia laevis, thereby significantly increasing the cell density of Nitzschia laevis in sterile fermentation broth, and then treating high density fucoxanthin induction culture solution of Nitzschia laevis by using light treatment, inducing the accumulation of fucoxanthin, thereby further increasing productivity of fucoxanthin produced by fermentation.