Abstract
Microalgae are considered as a promising feed- stock for biomass production. The selection of the most suit- able species is based on several key parameters such as lipid and fatty acid productivity. In the present study, the growth of different microalgae strains was examined in freshwater me- dia for photoautotrophs suited for large-scale applications to identify the most suitable medium for each species. In the optimal medium, Scenedesmus obliquus showed the highest biomass productivity measured as increase of cell dry weight (0.25 g cellu dry weight (CDW) L −1 day −1 ), while Botryococ- cus braunii showed the highest lipid and total fatty acid content (430 and 270 mg g −1 CDW, respectively) among the tested species. Regarding lipid and total fatty acid productiv- ity, S. obliquus was the most lipid and total fatty acid produc- tivestrainwith41and18mgL −1 day −1 duringtheexponential phase, respectively. Additionally, the proportion of saturated and monounsaturated fatty acids increased with duration of the incubation in S. obliquus, while polyunsaturated fatty acids decreased. These results nominate S. obliquus as a promising microalga in order to serve as a feedstock for renewable energy production.
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