Under the high NaNO3 concentration supplied Zarrouk medium (5.0 g / L), the dry biomass (0.60 g / L) and the protein content (34.41%) which were higher than those under low NaNO3 concentration supplied medium (1.25 g / L and 2.5g / L, the antioxidant capacity, protein content, and amino acid profiles were high in both strains of Spirulina sp.