Effects of nitrogen sources on cell growth and lipid accumulation of green alga <Emphasis Type="Italic">Neochloris oleoabundans</Emphasis> |
| |
Authors: | Yanqun Li Mark Horsman Bei Wang Nan Wu Christopher Q Lan |
| |
Institution: | (1) Department of Chemical Engineering, University of Ottawa, 161 Louis Pasteur St., Ottawa, Ontario, K1N 6N5, Canada;(2) College of Life Science, South China Normal University, Guangzhou, China |
| |
Abstract: | Microalgal lipids are the oils of future for sustainable biodiesel production. However, relatively high production costs due
to low lipid productivity have been one of the major obstacles impeding their commercial production. We studied the effects
of nitrogen sources and their concentrations on cell growth and lipid accumulation of Neochloris oleoabundans, one of the most promising oil-rich microalgal species. While the highest lipid cell content of 0.40 g/g was obtained at
the lowest sodium nitrate concentration (3 mM), a remarkable lipid productivity of 0.133 g l−1 day−1 was achieved at 5 mM with a lipid cell content of 0.34 g/g and a biomass productivity of 0.40 g l−1 day−1. The highest biomass productivity was obtained at 10 mM sodium nitrate, with a biomass concentration of 3.2 g/l and a biomass
productivity of 0.63 g l−1 day−1. It was observed that cell growth continued after the exhaustion of external nitrogen pool, hypothetically supported by the
consumption of intracellular nitrogen pools such as chlorophyll molecules. The relationship among nitrate depletion, cell
growth, lipid cell content, and cell chlorophyll content are discussed. |
| |
Keywords: | Lipid Microalgal oils Microalgae Biofuel Biodiesel Nitrogen-starvation |
本文献已被 PubMed SpringerLink 等数据库收录! |
|