Isolation and Characterization of a Marine Microalga for Biofuel Production with Astaxanthin as a Co-Product

Energies

Zhiyong Liu¹  Chenfeng Liu¹  Yuyong Hou²  Shulin Chen²  Dongguang Xiao¹  Juankun Zhang¹ 

[1] College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; E-Mails:;Tianjin Key Laboratory for Industrial Biological Systems and Bioprocess Engineering, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China; E-Mails:

关键词: astaxanthin;    biofuel;    Coelastrum sp. HA-1;    marine microalgae;    microalgae removal efficiency;   

DOI  :  10.3390/en6062759

来源: mdpi

【 摘 要 】

Microalgae have been considered as a promising biomass for biofuel production, but freshwater resource consumption during the scaled-up cultivation are still a challenge. Obtaining robust marine strains capable of producing triacylglycerols and high value-added metabolites are critical for overcoming the limitations of water resources and economical feasibility. In this study, a marine microalga with lipid and astaxanthin accumulation capability was isolated from Bohai Bay, China. The alga was named as Coelastrum sp. HA-1 based on its morphological and molecular identification. The major characteristics of HA-1 and the effects of nitrogen on its lipid and astaxanthin accumulations were investigated. Results indicated that the highest biomass, lipid and astaxanthin yields achieved were 50.9 g m⁻² day⁻¹, 18.0 g m⁻² day⁻¹ and 168.9 mg m⁻² day⁻¹, respectively, after cultivation for 24 days. The fatty acids of HA-1, identified in their majority as oleic acid (56.6%) and palmitic acid (25.9%), are desirable biofuel feedstocks. In addition, this alga can be harvested with simple sedimentation, achieving 98.2% removal efficiency after settling for 24 h. These results suggest that Coelastrum sp. HA-1 has several desirable key features that make it a potential candidate for biofuel production.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.