6 research outputs found
Microalgal photobioreactors for power plant CO2 mitigation and bioenergy
EThOS - Electronic Theses Online ServiceGBUnited Kingdo
Fatty acids and proteins from marine cold adapted microalgae for biotechnology
Cold-adapted microalgae display unexpectedly high biomass production, pointing to their potential to produce high-value bioproducts under cold and light-limited conditions. From culture collections, we screened eight cold-adapted strains of different genera (Chlamydomonas, Chlorella, Tetraselmis, Pseudopleurochloris, Nannochloropsis and Phaeodactylum) for the production of fatty acids and proteins under low temperature and light regimes (T = 8, 15 °C; I = 50, 100 Îźmol sâ1 mâ2). Among the strains, the Arctic isolate Chlamydomonas sp. (RCC 2488) had better growth at 8 °C compared to 15 °C (up to 0.5 gDW Lâ1 dâ1) and highest productivities of protein and polyunsaturated fatty acids (PUFA) (70 and 65 mg Lâ1 dâ1, respectively). Two tested Tetraselmis strains (SAG 1.96, RCC 2604) achieved highest biomass productivities (0.7â1 gDW Lâ1 dâ1), containing up to 50 mg PUFA gDWâ1 and 15% proteins. Pseudopleurochloris antarctica (SAG 39.98) grew well at 15 °C (0.4 g Lâ1 dâ1), with 23% proteins in biomass and the highest eicosapentaenoic acid (EPA) productivity (7.6 mg Lâ1 dâ1). Chlorella stigmatophora (RCC 661) achieved productivities of 0.4 gDW Lâ1 dâ1 at 15 °C and produced extracellular polymeric substances (EPS). The major cause for the observed shifts in biochemical profiles was biomass concentration, which is an indicator for the prevailing growth stage. Based on the current experimental design, Chlamydomonas sp. (RCC 2488), T. chuii and P. antarctica can be suggested as the most promising strains for the production of protein and (polyunsaturated-) fatty acids at low temperatures. However, additional strain-specific studies are necessary to statistically validate these findings.</p