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Green Algae

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...

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Updated: Oct 1, 2025

Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids

Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids

Published on: January 7, 2019

Microalgae based production of single-cell protein.

Marcel Janssen¹, Rene H Wijffels², Maria J Barbosa¹

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

Current Opinion in Biotechnology

|March 1, 2022

Summary

Microalgae offer a sustainable protein source with high production potential. Further development and novel food approval are key for large-scale use in food and feed applications.

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Area of Science:

Biotechnology and Sustainable Agriculture

Background:

Microalgae are rich in protein and can be cultivated using minimal water and fertilizer.
Current microalgae production is limited, but techno-economic analyses indicate scalability and cost-reduction potential.

Purpose of the Study:

To assess the potential of microalgae as a sustainable protein source for food and feed.
To identify requirements for scaling up microalgae production in a post-fossil fuel economy.

Main Methods:

Review of microalgae cultivation systems and protein production efficiencies.
Analysis of techno-economic feasibility for large-scale production.
Evaluation of microalgal amino acid profiles and biomass pre-treatment methods.

Main Results:

Microalgae can yield 22-44 tons of protein per hectare annually.
Large-scale production may utilize carbon dioxide capture or crop-derived sugars.
Microalgal protein composition aligns with human and animal nutritional needs.

Conclusions:

Microalgae represent a promising, high-yield protein alternative.
Novel food approval is necessary to expand the range of microalgae species for single-cell protein applications.
Optimized pre-treatment methods are crucial for ensuring high-quality microalgal protein.