title: Effects of light intensity on the growth and lipid accumulation of microalga Scenedesmus sp. 11-1 under nitrogen limitation.
abstract: Scenedesmus spp. have been reported as potential microalgal species used for the lipid production. This study investigated the effects of light intensity (at three levels: 50, 250, and 400 μmol photons m(-2) s(-1)) on the growth and lipid production of Scenedesmus sp. 11-1 under N-limited condition. Carotenoid to chlorophyll ratio was higher when algae 11-1 grew under 250 and 400 μmol photons m(-2) s(-1) than that under 50 μmol photons m(-2) s(-1), while protein contents was lower. Highest biomass yield (3.88 g L(-1)), lipid content (41.1 %), and neutral lipid content (32.9 %) were achieved when algae 11-1 grew at 400 μmol photons m(-2) s(-1). Lipid production was slight lower at 250 μmol photons m(-2) s(-1) level compared to 400 μmol photons m(-2) s(-1). The major fatty acids in the neutral lipid of 11-1 were oleic acid (43-52 %), palmitic acid (24-27 %), and linoleic acid (7-11 %). In addition, polyunsaturated fatty acids had a positive correlation with total lipid production, and monounsaturated fatty acids had a negative one.
authors.affiliation: Key Laboratory of Biofuels, Qingdao Institute of BioEnergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China.
authors.forename: Junhan
authors.initials: J
authors.lastname: Liu
authors.forename: Cheng
authors.initials: C
authors.lastname: Yuan
authors.forename: Guangrong
authors.initials: G
authors.lastname: Hu
authors.forename: Fuli
authors.initials: F
authors.lastname: Li
mesh_terms: D004307:Dose-Response Relationship, Radiation; D005227:Fatty Acids / Q000737:chemistry / Q000378:metabolism; D008027:Light; D050356:Lipid Metabolism / Q000528:radiation effects*; D058086:Microalgae / Q000254:growth & development* / Q000378:metabolism* / Q000528:radiation effects; D009566:Nitrates / Q000378:metabolism; D009584:Nitrogen / Q000172:deficiency*; D010860:Pigments, Biological / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism; D044444:Scenedesmus / Q000254:growth & development* / Q000378:metabolism* / Q000528:radiation effects
chemical_list: D005227:Fatty Acids; D009566:Nitrates; D010860:Pigments, Biological; D010940:Plant Proteins; D009584:Nitrogen