title: Effect of phosphorus on biodiesel production from Scenedesmus obliquus under nitrogen-deficiency stress.
abstract: In order to study the effect of phosphorus on biodiesel production from Scenedesmus obliquus especially under nitrogen deficiency conditions, six types of media with combinations of nitrogen repletion/depletion and phosphorus repletion/limitation/depletion were investigated in this study. It was found that nitrogen starvation compared to nitrogen repletion enhanced biodiesel productivity. Moreover, biodiesel productivity was further strengthened by varying the supply level of phosphorus from depletion, limitation, through to repletion. The maximum FAMEs productivity of 24.2 mg/L/day was obtained in nitrogen depletion with phosphorus repletion, which was two times higher than that in nutrient complete medium. More phosphorus was accumulated in cells under the nitrogen starvation with sufficient phosphorus condition, but no polyphosphate was formed. This study indicated that nitrogen starvation plus sufficient P supply might be the real "lipid trigger". Furthermore, results of the current study suggest a potential application for utilizing microalgae to combine phosphorus removal from wastewater with biodiesel production.
authors.affiliation: Advanced Laboratory for Environmental Research and Technology, USTC-CityU, Suzhou, PR China.
authors.forename: Fei-Fei
authors.initials: FF
authors.lastname: Chu
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China.
authors.forename: Pei-Na
authors.initials: PN
authors.lastname: Chu
authors.affiliation: Advanced Laboratory for Environmental Research and Technology, USTC-CityU, Suzhou, PR China.
authors.forename: Xiao-Fei
authors.initials: XF
authors.lastname: Shen
authors.affiliation: Advanced Laboratory for Environmental Research and Technology, USTC-CityU, Suzhou, PR China; State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong.
authors.forename: Paul K S
authors.initials: PK
authors.lastname: Lam
authors.affiliation: Advanced Laboratory for Environmental Research and Technology, USTC-CityU, Suzhou, PR China; Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China. Electronic address: rzeng@ustc.edu.cn.
authors.forename: Raymond J
authors.initials: RJ
authors.lastname: Zeng
mesh_terms: D056804:Biofuels / Q000382:microbiology*; D018533:Biomass; D004952:Esters / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D009584:Nitrogen / Q000172:deficiency*; D010758:Phosphorus / Q000494:pharmacology*; D044444:Scenedesmus / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D013312:Stress, Physiological / Q000187:drug effects*
chemical_list: D056804:Biofuels; D004952:Esters; D010758:Phosphorus; D009584:Nitrogen
keywords: Biodiesel productivity; Lipid trigger; Nitrogen deficiency; Phosphorus effect; Scenedesmus obliquus FACHB-417