Light Stress after Heterotrophic Cultivation Enhances Lutein and Biofuel Production from a Novel Algal Strain Scenedesmus obliquus ABC-009

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Scenedesmus obliquus ABC-009 is a microalgal strain that accumulates large amounts of lutein, particularly when subjected to growth-limiting conditions. Here, the performance of this strain was evaluated for the simultaneous production of lutein and biofuels under three different modes of cultivation - photoautotrophic mode using BG-11 medium with air or 2% CO2 and heterotrophic mode using YM medium. While it was found that the highest fatty acid methyl ester (FAME) level and lutein content per biomass (%) were achieved in BG-11 medium with CO2 and air, respectively, heterotrophic cultivation resulted in much higher biomass productivity. While the cell concentrations of the cultures grown under BG-11 and CO2 were largely similar to those grown in YM medium, the disparity in the biomass yield was largely attributed to the larger cell volume in heterotrophically cultivated cells. Post-cultivation light treatment was found to further enhance the biomass productivity in all three cases and lutein content in heterotrophic conditions. Consequently, the maximum biomass (757.14 +/- 20.20 mg/l/d), FAME (92.78 +/- 0.08 mg/l/d), and lutein (1.006 +/- 0.23 mg/ l/d) productivities were obtained under heterotrophic cultivation. Next, large-scale lutein production using microalgae was demonstrated using a 1-ton open raceway pond cultivation system and a low-cost fertilizer (Eco-Sol). The overall biomass yields were similar in both media, while slightly higher lutein content was obtained using the fertilizer owing to the higher nitrogen content. <comment>Superscript/Subscript Available</comment
Publisher
KOREAN SOC MICROBIOLOGY &amp; BIOTECHNOLOGY
Issue Date
2022-03
Language
English
Article Type
Article
Citation

JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY, v.32, no.3, pp.378 - 386

ISSN
1017-7825
DOI
10.4014/jmb.2108.08021
URI
http://hdl.handle.net/10203/297397
Appears in Collection
CBE-Journal Papers(저널논문)
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