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Energies 2013, 6(6), 2759-2772; doi:10.3390/en6062759
Article

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

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1 College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China 2 Tianjin Key Laboratory for Industrial Biological Systems and Bioprocess Engineering, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
* Author to whom correspondence should be addressed.
Received: 6 February 2013 / Revised: 17 May 2013 / Accepted: 18 May 2013 / Published: 29 May 2013
(This article belongs to the Special Issue Algae Fuel 2013)
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Abstract

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.
Keywords: astaxanthin; biofuel; Coelastrum sp. HA-1; marine microalgae; microalgae removal efficiency astaxanthin; biofuel; Coelastrum sp. HA-1; marine microalgae; microalgae removal efficiency
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Liu, Z.; Liu, C.; Hou, Y.; Chen, S.; Xiao, D.; Zhang, J.; Chen, F. Isolation and Characterization of a Marine Microalga for Biofuel Production with Astaxanthin as a Co-Product. Energies 2013, 6, 2759-2772.

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