Effect of NaNO 3 and NaHCO 3 Concentration on Microglae Arthrospira platensis Growth

Arthrospira platensis (A. platensis) is one of the most explored cyanobacteria and has been studied for proteins, vitamins, pigment (chlorophyll and carotenoids) and fatty acid. In this study, we tested the effect of NaHCO₃ and NaNO₃ on the microalgae growth under photoautothrophic culture in A. platensis. As a result, cell growth and dry cell weight were increased in proportion to the NaHCO₃ and NaNO₃ concentration. Pigment (chlorophyll and carotenoids) contents of A. platensis were increased with proportion to NaHCO₃ concentration. But, the content of pigment (chlorophyll and carotenoids) in 100% NaNO₃ medium of A. platensis was the highest, 40%, 140% and 200% NaNO₃ medium with pigment content of A. platensis was reduced. In conditions of NaHCO₃ (50%) or NaNO₃ (40%) limitation, A. platensis could accumulate lipids to high as 1.7-fold and 1.3-fold.