title: Effect of ferric ion on nitrogen consumption, biomass and oil accumulation of a Scenedesmus rubescens-like microalga.
abstract: This investigation examined the effects of ferric ion source and concentration on the biomass yield, fatty acid methyl esters (FAME) productivity and composition from Scenedesmus rubescens-like microalga. The algae cultivated with Fe(2+)-SO(4)(2-)/EDTA had higher ash free dry biomass (AFDB) production and in vivo chlorophyll a concentration than those with Fe(2+)-SO(4)(2-) and Fe(3+)-Cl(-) (P<0.001). The high or low Fe(2+) concentration can partly restrict the ammonia consumption, the AFDB and FAME accumulation. The algae at 1mg/L Fe(2+) concentration had the highest AFDB and FAME productivity (341.1 ± 25.8 and 107.8 ± 19.3mg/L/d) (P<0.001). The mean content of C16 and C18 series at all Fe(2+) concentrations was 88.6% ± 2.9% of total FAME, and it decreased with the increase of Fe(2+) concentrations. Among the fatty acids profiles, the contents of C18: 0, C18: 1n-7 and C18: 1n-9 are significantly changed under the different Fe(2+) concentrations, but not the contents of C16 series.
authors.affiliation: Key Laboratory of Marine Bio-resource Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China. linqiangzsu@163.com
authors.forename: Qiang
authors.initials: Q
authors.lastname: Lin
authors.forename: Na
authors.initials: N
authors.lastname: Gu
authors.forename: Junda
authors.initials: J
authors.lastname: Lin
mesh_terms: D000042:Absorption / Q000187:drug effects; D000641:Ammonia / Q000378:metabolism; D018533:Biomass; D002734:Chlorophyll / Q000378:metabolism; D000077194:Chlorophyll A; D004952:Esters / Q000378:metabolism; D005227:Fatty Acids / Q000378:metabolism; D007477:Ions; D007501:Iron / Q000494:pharmacology*; D050356:Lipid Metabolism / Q000187:drug effects*; D058086:Microalgae / Q000187:drug effects / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*; D044444:Scenedesmus / Q000187:drug effects / Q000378:metabolism*
chemical_list: D004952:Esters; D005227:Fatty Acids; D007477:Ions; D002734:Chlorophyll; D000641:Ammonia; D007501:Iron; D009584:Nitrogen; D000077194:Chlorophyll A