title: Optimization of growth and fatty acid composition of a unicellular marine picoplankton, Nannochloropsis sp., with enriched carbon sources.
abstract: A unicellular marine picoplankton, Nannochloropsis sp., was grown under CO2-enriched photoautotrophic or/and acetate-added mixotrophic conditions. Photoautotrophic conditions with enriched CO2 of 2800 microl CO2 l(-1) and aeration gave the highest biomass yield (634 mg dry wt l(-1)), the highest total lipid content (9% of dry wt), total fatty acids (64 mg g(-1) dry wt), polyunsaturated fatty acids (35% total fatty acids) and eicosapentaenoic acid (EPA, 20:5omega3) (16 mg g(-1) dry wt or 25% of total fatty acids). Mixotrophic cultures gave a greater protein content but less carbohydrates. Adding sodium acetate (2 mM) decreased the amounts of the total fatty acids and EPA. Elevation of CO2 in photoautotrophic culture thus enhances growth and raises the production of EPA in Nannochloropsis sp.
authors.affiliation: Marine Biology Institute, Science Center, Shantou University, Shantou 515063, PR China.
authors.forename: Hanhua
authors.initials: H
authors.lastname: Hu
authors.forename: Kunshan
authors.initials: K
authors.lastname: Gao
mesh_terms: D018533:Biomass; D050260:Carbohydrate Metabolism; D002244:Carbon / Q000378:metabolism*; D002245:Carbon Dioxide / Q000378:metabolism; D018929:Cell Culture Techniques / Q000379:methods; D002455:Cell Division / Q000502:physiology; D002478:Cells, Cultured; D015118:Eicosapentaenoic Acid; D056890:Eukaryota / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D005227:Fatty Acids / Q000096:biosynthesis*; D005231:Fatty Acids, Unsaturated / Q000096:biosynthesis; D050356:Lipid Metabolism; D010933:Plankton / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism*; D011506:Proteins / Q000378:metabolism; D011786:Quality Control; D019346:Sodium Acetate / Q000494:pharmacology
chemical_list: D005227:Fatty Acids; D005231:Fatty Acids, Unsaturated; D011506:Proteins; D002245:Carbon Dioxide; D019346:Sodium Acetate; D002244:Carbon; D015118:Eicosapentaenoic Acid