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Effects of light intensity and carbon dioxide on lipids and fatty acids produced by Synechocystis sp. PCC6803 during continuous flow

dc.creatorSara Paulina Cuellar Bermudez
dc.creatorRoberto Parra Saldivar
dc.date2015
dc.date.accessioned2018-10-18T20:34:47Z
dc.date.available2018-10-18T20:34:47Z
dc.identifier.issn22119264
dc.identifier.doi10.1016/j.algal.2015.07.018
dc.identifier.urihttp://hdl.handle.net/11285/630359
dc.descriptionWe studied the effects of light intensity (LI) and CO2 supply on pH and total lipid production and fatty acids by Synechocystis sp. PCC6803 during continuous-flow operation of a photobioreactor having continuous nutrient supply. The temperature was fixed at 30 °C, and the LI pattern mimicked a day/night light cycle from 0 to 1920 μmol/m2 s. The CO2 supply varied from1 to 5% v/v of total air. The total lipid content increased proportionally to LI, reaching a high content of 14% of dry weight (DW) at the highest LI at 3% CO2. In contrast, LI had no significant influence on the total fatty acid content, which was 3.4% ± 0.5% DW, measured as fatty acid methyl esters (FAMEs). Palmitic acid (C16:0) was the main fatty acid (52% of FAMEs), but γ-linolenic acid (C18:3n6) and linoleic acid (C18:2) were significant at 20% and 14% of total FAMEs, respectively. Also, a-linolenic acid (C18:3n3), oleic acid (C18:1), and palmitoleic acid (C16:1) represented 5%, 4%, and 4% of the total FAMEs, respectively. In case of C16:0, its highest content was achieved at LI of 400 to 1500 μmol/m2 s and pH media values from 7.2 to 8.8 (3% CO2). The highest formation of C16:1 and C18:1 (desirable for biodiesel production) occurred with LI up to 600 μmol/m2 s at pH 9 (3% CO2). Stearic acid (C18:0) and linoleic acid (C18:2) contents did not vary with LI or pH, but α-linolenic acid (C18:3n3) formation occurred with patterns opposite to C18:3n6, C16:0, and C16:1. LI of 400 to 1600 μmol/m2 s and pH range from 7.7 to 8.7 led to the highest values of C18:3n6 (0.8% DW), but C18:3n3 was suppressed by these conditions, supporting a desaturation pathway in Synechocystis. These results point to strategies to optimize LI, CO2, and pH, to enhance the fatty acid production profile for biofuel production. © 2015 The Authors. Published by Elsevier B.V.
dc.languageeng
dc.publisherElsevier
dc.relationhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84947945110&doi=10.1016%2fj.algal.2015.07.018&partnerID=40&md5=a503b90f7786ddecacdf7dc2997f43d8
dc.relationInvestigadores
dc.relationEstudiantes
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0
dc.sourceAlgal Research
dc.subject.classification7 INGENIERÍA Y TECNOLOGÍA
dc.titleEffects of light intensity and carbon dioxide on lipids and fatty acids produced by Synechocystis sp. PCC6803 during continuous flow
dc.typeArtículo
dc.identifier.volume12
dc.identifier.startpage10
dc.identifier.endpage16
refterms.dateFOA2018-10-18T20:34:47Z


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