Cited by 60Algal biology and biofuel productionLipid metabolism and biosynthesisMicrobial Metabolic Engineering and Bioproduction

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

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Cuellar-Bermudez, Sara P., Romero-Ogawa, Miguel A., Vannela, Raveender, Lai, YenJung Sean, Rittmann, Bruce E., Parra-Saldivar, Roberto·2015·Algal Research

Abstract

We 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 from 1 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, α-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.

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Authors
Cuellar-Bermudez, S. P., Romero-Ogawa, M. A., Vannela, R., Lai, Y. S., Rittmann, B. E., & Parra-Saldivar, R.
Affiliations
Arizona State University (US)
Venue
Algal Research
Publisher
Elsevier BV
Published
2015-11
Volume
12
Pages
10-16
ISSN
2211-9264 (ISSN-L)
OpenAlex
W1149646281
Cited by
60
References
47
Citations by year
2026: 1 · 2025: 3 · 2024: 5 · 2023: 1 · 2022: 7 · 2021: 8 · 2020: 7 · 2019: 7 · 2018: 8 · 2017: 8 · 2016: 5
FWCI
2.07
Type
journal article
Language
en
Open access
Locations
  • Algal Research (publishedVersion, cc-by)
  • Institutional Repository of Tecnológico de Monterrey (Tecnológico de Monterrey) (submittedVersion, cc-by-nc-nd)
Funders
CONACyT (343023)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
Keywords
Synechocystis sp. PCC 6803, microalgal lipid production, fatty acid composition, light intensity, CO2 concentration, photobioreactors, continuous flow operation, fatty acid methyl esters, palmitic acid, gamma-linolenic acid, alpha-linolenic acid, oleic acid, palmitoleic acid, pH effect

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