We explored the effect of pH and nitrogen supply on the biomass and fatty acid productivities of the microalga Neochloris oleoabundans cultivated in saline medium under continuous light. During light-limited and nitrogen-replete conditions, the maximal volumetric biomass productivity was 0.98 gDW L-1 d-1 at pH 8.2 and 0.47 gDW L-1 d-1 at pH 10. Apparently microalgal growth costs more energy at high pH, resulting in lower biomass productivities.With the fatty acid content being 2-fold higher at pH 10 (8% versus 15% w/w), the maximal volumetric fatty acid productivity was 75.2 mgFA L-1 d-1 at pH 8.2 and 66.6 mgFA L-1 d-1 at pH 10.When high pH was combined with nitrogen depletion, fatty acids accumulated up to 29% (w/w), leading to the highest fatty acid productivity observed in this study (112.4 mgFA L-1 d-1). These findings stimulate further development of a two-stage process for optimal overall lipid productivity.
|Publication status||Published - 2013|
- photosynthetic efficiency