Systematic solvent selection enables the fractionation of wet microalgal biomass

• Published in: Separation and purification technology Vol. 354; p. 129462
• Main Authors: König-Mattern, Laura, Rihko-Struckmann, Liisa, Sundmacher, Kai
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 19.02.2025
• Subjects: Biorefineries; Carotenoid/lipid separation; COSMO-RS; Microalgae; Phaeodactylum tricornutum; Solvent selection; Wet extraction; Wet extraction; Carotenoid/lipid separation; Biorefineries; Phaeodactylum tricornutum; Microalgae; COSMO-RS; Solvent selection
• ISSN: 1383-5866
• DOI: 10.1016/j.seppur.2024.129462

[Display omitted] •Our computational method identified solvents for microalgal biorefineries.•The solvents were experimentally validated on P. tricornutum biomass.•2-butanol and water enable effective fractionation of wet P. tricornutum biomass.•The fractionation approach operates at ambient temperature using benign solvents.•No energy-intensive biomass drying step is required. Wet microalgal biomass was recently proposed as a feedstock to circumvent the energy-intensive drying step in biorefineries. However, solvents commonly applied to extract valuable target compounds from dried biomass are usually less effective when applied on wet biomass. In the present study, we investigated the potential of systematic solvent selection to increase pigment and lipid yields for the extraction of wet Phaeodactylum tricornutum biomass. The solvent selection was guided by a large-scale computational screening approach. Experiments revealed, that 2-butanol – a non-toxic, partially water-miscible solvent – extracted 99.4 wt% of lipids and 82.6 wt% of carotenoids from wet biomass. By using only 2-butanol and water as benign solvents, we developed a biorefinery approach that effectively fractionates wet microalgal biomass under ambient conditions into proteins, carbohydrates, carotenoids and lipids without the need for energy-intensive biomass drying.