title: Influence of the CO2 absorbent monoethanolamine on growth and carbon fixation by the green alga Scenedesmus sp.
abstract: The influence of monoethanolamine (MEA) as a CO(2) absorbent on photoautotrophic culture of CO(2)-fixing microalgae was investigated. When 300 ppm MEA (4.92 mM) was added to blank culture medium, the dissolved inorganic carbon and the molar absorption ratio increased to 51.0mg/L and 0.34 mol CO2 = mol MEA, respectively, which was an almost 6-fold increase in CO(2) solubility. When free MEA up to 300 mg/L was added to a green alga Scenedesmus sp. culture that was supplied 5% (v/v) CO(2) at 0.1 vvm, both cell growth rate and final cell density were enhanced compared to when no MEA was added. The cell growth rate reached 288.6 mg/L/d, which was equivalent to 539.6 mg-CO(2)/L/d as a CO(2)-fixation rate and enhancement of about 63.0% compared to not adding MEA. Chlorophyll-a content and nitrate consumption rate increased correspondingly. MEA doses higher than 400mg/L inhibited cell growth, probably due to toxicity of the carbamate intermediate.
authors: Department of Environmental Engineering and Energy, Myongji University, Yongin 449-728, Republic of Korea.
authors: Wookjin
authors: W
authors: Choi
authors: Garam
authors: G
authors: Kim
authors: Kisay
authors: K
authors: Lee
mesh_terms: D000042:Absorption / Q000187:drug effects; D002244:Carbon / Q000032:analysis; D057486:Carbon Cycle / Q000187:drug effects*; D002245:Carbon Dioxide / Q000737:chemistry*; D003470:Culture Media / Q000737:chemistry; D019856:Ethanolamine / Q000494:pharmacology*; D044444:Scenedesmus / Q000166:cytology / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism*; D012995:Solubility
chemical_list: D003470:Culture Media; D002245:Carbon Dioxide; D019856:Ethanolamine; D002244:Carbon