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Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids
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Can We Approach Theoretical Lipid Yields in Microalgae?

Ilse M Remmers1, René H Wijffels2, Maria J Barbosa3

  • 1Bioprocess Engineering & AlgaePARC, Wageningen University and Research, PO Box 16, 6700 AA Wageningen, The Netherlands.

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Summary

Microalgae can achieve theoretical lipid yields, with a realistic maximum of 0.5g triacylglycerol per mol photons. Optimizing outdoor cultivation, strain development, and metabolic understanding are key to reaching this potential.

Keywords:
cultivation strategiesmetabolismmicroalgaeoutdoor productionstrain improvementtriacylglycerol (TAG)

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Algal Research

Background:

  • Microalgae are a promising source for sustainable lipid production.
  • Current lipid yields in microalgae are significantly below theoretical maximums.
  • Outdoor cultivation faces challenges due to fluctuating light conditions.

Purpose of the Study:

  • To assess the feasibility of approaching theoretical lipid yields in microalgae.
  • To identify key factors limiting current lipid production.
  • To outline strategies for enhancing microalgal lipid productivity.

Main Methods:

  • Analysis of factors influencing lipid accumulation in microalgae.
  • Review of current cultivation techniques and strain performance.
  • Exploration of molecular tools and metabolic engineering approaches.

Main Results:

  • A realistic maximum lipid yield of approximately 0.5g triacylglycerol (TAG) per mol photons is achievable.
  • This represents a five-fold increase over current outdoor cultivation yields.
  • Key limitations include fluctuating insolation, suboptimal strain capacity, and the need for concurrent process optimization.

Conclusions:

  • Substantial improvements in microalgal lipid yields are possible.
  • Advancements in adaptive control models, strain engineering, and metabolic insights are critical.
  • Integrated optimization of strains and cultivation processes is essential for maximizing lipid production.