Laser Radiation Induces Growth and Lipid Accumulation in the Seawater Microalga Chlorella pacifica

Haonan Zhang, Zhengquan Gao, Zhe Li, Huanmin Du, Bin Lin, Meng Cui, Yonghao Yin, Fengming Lei, Chunyu Yu and Chunxiao Meng
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Haonan Zhang: School of Life Sciences, Shandong University of Technology, Zibo 255049, China
Zhengquan Gao: School of Life Sciences, Shandong University of Technology, Zibo 255049, China
Zhe Li: School of Life Sciences, Shandong University of Technology, Zibo 255049, China
Huanmin Du: School of Life Sciences, Shandong University of Technology, Zibo 255049, China
Bin Lin: School of Life Sciences, Shandong University of Technology, Zibo 255049, China
Meng Cui: School of Life Sciences, Shandong University of Technology, Zibo 255049, China
Yonghao Yin: School of Life Sciences, Shandong University of Technology, Zibo 255049, China
Fengming Lei: School of Life Sciences, Shandong University of Technology, Zibo 255049, China
Chunyu Yu: School of Life Sciences, Shandong University of Technology, Zibo 255049, China
Chunxiao Meng: School of Life Sciences, Shandong University of Technology, Zibo 255049, China

Energies, 2017, vol. 10, issue 10, 1-14

Abstract: The impacts of laser radiation (Nd: YAG laser, 1064 nm at 800 mW, He–Ne laser 808 nm at 6 W, semiconductor laser 632.8 nm at 40 mW) on growth and lipid accumulation of Chlorella pacifica were investigated in this study. The results showed growth rates increased 1.23, 1.41, and 1.40-fold over controls by 4 min Nd: YAG, 4 min He–Ne, and 8 min semiconductor laser treatments, respectively, whereas the corresponding nitrate reductase observed increased 1.25, 1.63, and 2.08-fold over controls. Moreover, total chlorophyll concentration was increased to 1.09, 1.29, and 1.33-fold over controls, respectively. After 20 days cultivation, the highest lipid content was 35.99%, 18.46%, and 31.00% after 2 min Nd: YAG, 4 min He–Ne, and 4 min semiconductor laser treatments, corresponding to 2.86, 1.50, and 2.46-fold increase over controls, respectively. Furthermore, the lipid productivity of the above 3 treatments were 15.25 ± 2.56, 16.25 ± 2.45, and 14.75 ± 2.11 mg L ?1 d ?1 . However, the highest lipid productivity was 22.00 ± 3.28, 16.25 ± 2.45, and 19.25 ± 1.78 mg L ?1 d ?1 , in response to treatment for 2 min Nd: YAG, 1 min He–Ne, and 4 min semiconductor laser treatments, with 2.67, 1.97, and 2.33-fold increase over controls, respectively. These results indicated that lipid accumulation efficiency of C. pacifica could be significantly improved by laser irradiation using Nd: YAG, He–Ne, and semiconductor laser treatments.

Keywords: cell growth; Chlorella pacifica; chlorophylls; laser irradiation; lipid productivity; nitrate reductase (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
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