| 초록 |
For sustainable production of biofuels from microalgae, sunlight should be used as the light source. During night, microalgae consume the storage compounds, resulting in decreased biomass, known as night biomass loss (NBL). In this study, Tetraselmis sp. MBEgh01L (KCTC12236BP) and Nannochloropsis oculata K-1281 (SCCAP) were cultivated in 12:12h L/D cycle for comparison of the effects of L/D cycle on their fatty acid productivities. The microalgae were cultivated in bubble column photobioreactors with 2 L of modified f/2-Si medium in natural seawater with 2% CO2-enriched air at 0.1 vvm. The fatty acid contents in Tetraselmis sp. and N. oculata were up to 8.4% and 20.6%, respectively. The presence of L/D cycle significantly decreased fatty acid productivities by 65% and 72% in T. sp. and N. oculata, respectively. Rather than the fatty acid contents, the biomass production was greatly reduced by the L/D cycle. Development of economical methods for reducing the NBL will improve for improved microalgal fatty acid productions in outdoor cultivation. |
