The Effect of Trophic Modes on Biomass and Lipid Production of Five Microalgal Strains

Five microalgae strains, namely Isochrysis galbana, Microchloropsis gaditana, Scenedesmus obliquus, Nannochloropsis oculata and Tetraselmis suecica, were selected as potential candidates for polyunsaturated fatty acids’ production, evaluating biomass productivity their capacity to accumulate high lipid contents under different trophic modes. Microalgae strains cultivated in the presence of 1% glucose using mixotrophic heterotrophic conditions, while autotrophic cultures served control experiments. The results demonstrate that S. obliquus performed highest reached 0.13 0.14 g L−1 d−1 respectively. I. galbana utilized elevated mixotrophy, removing 55.9% 95.6% initial concentration carbohydrate, respectively, consumption by aforementioned also remained cultivation. production lipids was maximal mixotrophy heterotrophy, performing productivities 24.85 22.77 mg d−1, most abundant saturated acid detected all evaluated palmitic (C16:0), oleic linolenic acids (C18:1n9c/C18:3n3) comprised unsaturated acids. linoleic (C18:2n6c) content nutrition, which 87.9 g−1 ash-free dry weight. Among compared, monitored confirm both could serve efficient bioproducers application algal biorefineries.