title: Carbon dioxide fixation and lipid storage by Scenedesmus obtusiusculus.
abstract: An indigenous microalga was isolated from the springs in Cuatro Ciénegas, México. It was morphologically identified as Scenedesmus obtusiusculus and cultivated in bubble-column photobioreactors in batch operation mode. This microalga grows at 10% of carbon dioxide (CO(2)) showing a maximum CO(2) fixation rate of 970gm(-3)d(-1). The microalga, without any nutrient limitation, contained 20% of nonpolar lipids with a biomass productivity of 500gm(-3)d(-1) and a maximum biomass concentration of around 6,000gm(-3) at 5% CO(2) and irradiance of 134μmolm(-2)s(-1). Furthermore, it was observed that the microalga stored 55.7% of nonpolar lipids when 5% CO(2) was fed at 0.8vvm and 54.7μmolm(-2)s(-1) under nitrogen starvation. The lipid profile included C16:0, C18:0, C18:1n9t, C18:1n9c, C18:3n6 with a productivity of 200g lipid m(-3)d(-1). Therefore, the microalga may have biotechnological potential producing lipids for biodiesel.
authors: Doctorado en Ciencias Biológicas, Universidad Autónoma Metropolitana UAM-Iztapalapa, Mexico.
authors: Alma
authors: A
authors: Toledo-Cervantes
authors: Marcia
authors: M
authors: Morales
authors: Eberto
authors: E
authors: Novelo
authors: Sergio
authors: S
authors: Revah
mesh_terms: D000388:Air; D057486:Carbon Cycle; D002245:Carbon Dioxide / Q000378:metabolism*; D008027:Light; D050356:Lipid Metabolism; D058086:Microalgae / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism; D044444:Scenedesmus / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D002245:Carbon Dioxide; D009584:Nitrogen