Influence of NaNO3 concentration and incident light intensity on Nannochloropsis oculata lipid accumulation

Abstract

This study aimed at evaluating the best conditions for lipid accumulation in the marine microalga Nannochloropsis oculata in an airlift photobioreactor. Experiments were carried out following a central composite design with the following variables: temperature (19 to 29°C), sodium nitrate concentration (NaNO3) in the culture medium (f/2) (25 to 125 mg.L-ˡ) and incident light intensity (49 to 140 μE.m-²s-ˡ). The maximum lipid production was 132.4 mg.L-ˡ under the following conditions: 27°C, NaNO3 concentration 105 mg.L-ˡ and 122 μE.m-².s-ˡ, which was 30% of dry weight of the biomass.