Enhanced Lipid Production of Chlorella sp. HS2 Using Serial Optimization and Heat Shock

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Chlorella sp. HS2, which previously showed excellent performance in phototrophic cultivation and has tolerance for wide ranges of salinity, pH, and temperature, was cultivated heterotrophically. However, this conventional medium has been newly optimized based on a composition analysis using elemental analysis and ICP-OES. In addition, in order to maintain a favorable dissolved oxygen level, stepwise elevation of revolutions per minute was adopted. These optimizations led to 40 and 13% increases in the biomass and lipid productivity, respectively (7.0 and 2.25 g l(-1) d(-1) each). To increase the lipid content even further, 12 h heat shock at 50 degrees C was applied and this enhanced the biomass and lipid productivity up to 4 and 17% respectively (7.3 and 2.64 g l(-1)d(-1), each) relative to the optimized conditions above, and the values were 17 and 14% higher than ordinary lipid-accumulating N-limitation (6.2 and 2.31 g l(-1)d(-1)). On this basis, heat shock was successfully adopted in novel Chlorella sp. HS2 cultivation as a lipid inducer for the first time. Considering its fast and cost-effective characteristics, heat shock will enhance the overall microalgal biofuel production process.
Publisher
KOREAN SOC MICROBIOLOGY & BIOTECHNOLOGY
Issue Date
2020-01
Language
English
Article Type
Article
Citation

JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY, v.30, no.1, pp.136 - 145

ISSN
1017-7825
DOI
10.4014/jmb.1910.10033
URI
http://hdl.handle.net/10203/272582
Appears in Collection
CBE-Journal Papers(저널논문)
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