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Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids
Published on: January 7, 2019
Marine microalgae selection and culture conditions optimization for biodiesel production
A San Pedro1, C V González-López, F G Acién
1Department of Chemical Engineering, University of Almería, E04120 Almería, Spain.
Bioresource Technology
|March 26, 2013
Summary
Optimizing microalgae cultivation for biomass and lipid production is key. Nannochloropsis gaditana achieved high biomass productivity, and a two-stage culture strategy enhanced lipid accumulation significantly.
Area of Science:
- * Marine Biology and Biotechnology
- * Microalgal Physiology and Cultivation
Background:
- * Microalgae are crucial for sustainable production of biomass and valuable compounds.
- * Optimizing culture conditions is essential for maximizing productivity and specific metabolite accumulation.
- * Nannochloropsis gaditana is a promising species for industrial applications.
Purpose of the Study:
- * To evaluate the impact of dilution rates and media composition on biomass productivity in four microalgal species.
- * To determine optimal nitrate concentrations for Nannochloropsis gaditana biomass production.
- * To investigate a two-stage culture strategy for enhanced lipid accumulation in N. gaditana.
Main Methods:
- * Continuous cultures of Nannochloropsis gaditana, Tetraselmis chuii, Tetraselmis suecica, and Phaeodactylum tricornutum were performed.
- * Dilution rates, culture media, and nitrate concentrations were systematically varied.
- * A two-stage cultivation strategy involving nitrate depletion and light stress was implemented.
Main Results:
- * Nannochloropsis gaditana reached a maximum biomass productivity of 0.49 g/L/day at a dilution rate of 0.42/day.
- * Optimal nitrate concentration for N. gaditana biomass was found to be 8.0 mM, with peak productivities at dilution rates of 0.30–0.40/day.
- * The two-stage culture yielded 51 mg fatty acids/L/day, increasing neutral lipid content to 73.1% of total lipids.
Conclusions:
- * Dilution rate and nitrate availability significantly influence microalgal biomass productivity.
- * A two-stage culture strategy effectively enhances lipid accumulation and modifies fatty acid profiles in N. gaditana.
- * Combining nitrogen depletion with light stress is a viable method for boosting lipid content in microalgae.
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