The two microalgae B. braunii and N. gaditana were obtained from Desert Bioenergy SA, Chile. Both microalgae were cultivated according to Bazaes et al. [11]. In order to facilitate lipid extraction, the biomass was dried in a dried tunnel until 70–80 wt.% and finally milled. The dry matter content of the initial biomass was approximately 20 wt.%. Lipid extraction was performed during 6 h by using a Soxhlet systems [12] with petroleum ether (PE) as a solvent. The organic fraction (lipid) was concentrated by solvent removal in a rotatory evaporator and stored in darkness at 4 C for its characterization and further experiments.