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DOI: https://doi.org/10.4491/eer.2017.162
Use of tar color additives as a light filter to enhance growth and lipid production by the microalga Nannochloropsis gaditana
Won-Sub Shin1, Simon MoonGeun Jung2,3, Chang-Ho Cho4, Do-Wook Woo4,5, Woong Kim6,7, and Jong-Hee Kwon4,5
1Department of Chemical and Biomolecular Engineering, KAIST, Daejeon 34141, Republic of Korea
2Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea
3Green Chemistry and Environmental Biotechnology, University of Science and Technology, Daejeon 34113, Republic of Korea
4Department of Food Science and Technology, Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea
5Division of Applied Life Sciences (BK21 plus), Gyeongsang National University, Jinju 52828, Republic of Korea.
6Department of Environmental Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
7Advanced Institute of Water Industry, Kyungpook National University, Daegu 41566, Republic of Korea
Corresponding Author: Jong-Hee Kwon ,Tel: +82-55-772-1901 , Fax: +82-55-772-1909, Email: jhkwon@gnu.ac.kr
Received: October 31, 2017;  Accepted: January 26, 2018.
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ABSTRACT
The spectral composition of light can affect the growth and biochemical composition of photosynthetic microalgae. This study examined the use of light filtering through a solution of soluble colored additives, a cost-effective method to alter the light spectrum, on the growth and lipid production of an oleaginous microalga, Nannochloropsis gaditana (N. gaditana). Cells were photoautotrophically cultivated under a white light emitting diode (LED) alone (control) or under a white LED that passed through a solution of red and yellow color additive (4:1 ratio) that blocked light below 600 nm. The specific growth rate was significantly greater under filtered light than white light (0.2672 d-1 vs. 0.1930 d-1). Growth under filtered light also increased the fatty acid methyl ester (FAME) yield by 22.4% and FAME productivity by 80.0%, relative to the white light control. In addition, the content of saturated fatty acids was greater under filtered light, so the biodiesel products had better stability. These results show that passing white light through an inexpensive color filter can simultaneously enhance cellular growth and lipid productivity of N. gaditana. This approach of optimizing the light spectrum may be applicable to other species of microalgae.
Keywords: Biofuel production | Color additive | Light filter | Nannochloropsis gaditana | Wavelength
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