Unlocking nature's treasure-chest: screening for oleaginous algae

Area of Science:

• Biotechnology
• Marine Biology
• Phycology

Background:

• Micro-algae are photoautotrophic powerhouses, synthesizing lipids, carbohydrates, and proteins.
• Current large-scale cultivation focuses on pigments and health foods, limiting broader biotechnological potential.
• Economic viability for products like biofuels and pharmaceuticals necessitates high-lipid-producing micro-algal strains.

Purpose of the Study:

• To develop and validate a rapid screening method for identifying marine micro-algal strains with high lipid productivity.
• To assess marine micro-algae for scalable cultivation, minimizing competition with agriculture for water resources.
• To identify specific strains suitable for diverse biotechnological applications beyond biofuels.

Main Methods:

• Elemental analysis (Mass-Spectrophotometry) of nitrogen (N) and carbon (C) as a proxy for biomass composition.
• Validation of elemental analysis through Gas-Chromatography (GC) measurement of total fatty acids (TFA).
• Screening of diverse marine micro-algal strains for lipid, carbohydrate, and protein content.

Main Results:

• Elemental analysis proved to be a rapid and accurate screening strategy for lipid productivity.
• Nannochloropsis oceanica CCAP 849/10 and Chlorella vulgaris CCAP 211/21A were identified as top lipid-producing strains.
• Dunaliella polymorpha CCAP 19/14 excelled in carbohydrate production, while Cyclotella cryptica CCAP 1070/2 showed potential for EPA production.

Conclusions:

• A cost-effective elemental analysis method enables efficient screening of micro-algae for biotechnological applications.
• Selected marine micro-algal strains demonstrate significant potential for large-scale production of lipids, carbohydrates, and specific fatty acids.
• This research supports the development of sustainable micro-algal-based industries, from biofuels to nutraceuticals.