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Biotechnology and Bioprocess Engineering

, Volume 24, Issue 1, pp 223–231 | Cite as

Autotrophic Biodiesel Production from the Thermotolerant Microalga Chlorella sorokiniana by Enhancing the Carbon Availability with Temperature Adjustment

  • Yoon Young Choi
  • Min-Eui Hong
  • Won Seok Chang
  • Sang Jun SimEmail author
Research Paper
  • 14 Downloads

Abstract

Chlorella sorokiniana is a thermo-resistant microalga that is widely used for production of biofuel such as biodiesel. When cultured at 37°C under autotrophic conditions, C. sorokiniana showed the highest production of biomass, whereas the cells exhibited the highest production of fatty acids at 30°C. Herein, culture temperature shift was applied to improve autotrophic biodiesel production via the two-stage strategy. In addition, in order to increase biomass production, dissolved inorganic carbon source (mainly bicarbonate ion species), which is essential for photosynthesis, was supplied in the cultures by dissolving the CO2 in alkaline solution. As a result, cell growth increased up to 22% compared to that of the control cells by supplying constant inorganic carbon source into the cultures. The cells cultured under the condition of temperature shift (37°C to 30°C) and bicarbonate solution showed an increase in biodiesel productivity by 31% when compared to the cells that were cultured without such temperature adjustment (37°C to 37°C). In brief, our temperature shift method with bicarbonate buffer system (inorganic carbon supply) will improve biofuel production including biodiesel from C. sorokiniana under autotrophic conditions.

Keywords

Chlorella sorokiniana thermotolerant microalga autotrophic biodiesel production two-stage strategy temperature shift bicarbonate buffer 

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Copyright information

© The Korean Society for Biotechnology and Bioengineering and Springer 2019

Authors and Affiliations

  • Yoon Young Choi
    • 1
  • Min-Eui Hong
    • 1
  • Won Seok Chang
    • 2
  • Sang Jun Sim
    • 1
    Email author
  1. 1.Department of Chemical and Biological EngineeringKorea UniversitySeoulKorea
  2. 2.Research InstituteKorea District Heating Corp.YonginKorea

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