Document Detail


Effects of nitrogen sources on cell growth and lipid accumulation of green alga Neochloris oleoabundans.
MedLine Citation:
PMID:  18795284     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Yanqun Li; Mark Horsman; Bei Wang; Nan Wu; Christopher Q Lan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-09-16
Journal Detail:
Title:  Applied microbiology and biotechnology     Volume:  81     ISSN:  1432-0614     ISO Abbreviation:  Appl. Microbiol. Biotechnol.     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-12-03     Completed Date:  2009-01-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8406612     Medline TA:  Appl Microbiol Biotechnol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  629-36     Citation Subset:  IM    
Affiliation:
Department of Chemical Engineering, University of Ottawa, 161 Louis Pasteur St., Ottawa, Ontario, K1N 6N5, Canada.
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MeSH Terms
Descriptor/Qualifier:
Algae, Green / growth & development*,  metabolism*
Biomass
Chlorophyll / metabolism
Lipid Metabolism*
Nitrogen / metabolism*
Chemical
Reg. No./Substance:
1406-65-1/Chlorophyll; 7727-37-9/Nitrogen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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