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Ten different microalgal species were screened for their antioxidant activity using 2,2 ́-diphenyl-1-picrylhydrazyl (DPPH) scavenging assay, both total phenolic and carotenoid contents were determined. The ethanolic extract ofOscillatoriasp. showed the highest antioxidant activity (69.1 %), while the greenChlorellasp. showed higher phenolic content (39.1 mg GAE g-1dry wt.) andScenedesmus obliquusrecorded higher carotenoid content (3.73 mg L-1), than cyanobacterial species Microalgal biomass plays a great role as a potential source of natural antioxidants, not only due to the carotenoids but also the phenolic compounds.

The present work investigated the effects of nitrogen (N), phosphorus (P), magnesium (Mg), carbonate (CO 3) concentrations and gamma radiation doses on growth and lipid production of Chlorella vulgaris. The obtained results showed that culture conditions have highly significant effects on biomass and lipid accumulation. The maximum lipid content was observed at 350, 40, 150,20 mg L −1 of N, P, Mg, and CO 3 concentrations, respectively. While the highest biomass yield was achieved at high N and P as well as reduced Mg and CO 3 concentrations. Whereas gamma radiation showed a negative effect. Lipid profile recorded maximum saturated (SFAs, 62.44%) and unsaturated fatty acids (UFAs, 37.56%) with palmitic acid (C16:0), linoleic acid (C18:2), pentadecanoic acid (C15:0), palmitoleic acid (C16:1) and oleic acid (C18:1) as predominant fatty acids, which prove that Chlorella vulgaris is a promising feedstock for biodiesel production.

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