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Mar. Drugs 2017, 15(6), 151;

Enhancement of Biomass and Lipid Productivities of Water Surface-Floating Microalgae by Chemical Mutagenesis

Division of Biotechnology and Life Science, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
Author to whom correspondence should be addressed.
Academic Editors: Paul Long, Allen Place, Rosemary Jagus, Joy Watts and Peer B. Jacobson
Received: 31 January 2017 / Revised: 19 May 2017 / Accepted: 24 May 2017 / Published: 27 May 2017
(This article belongs to the Special Issue Advances and New Perspectives in Marine Biotechnology II 2016)
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Water surface-floating microalgae have great potential for biofuel applications due to the ease of the harvesting process, which is one of the most problematic steps in conventional microalgal biofuel production. We have collected promising water surface-floating microalgae and characterized their capacity for biomass and lipid production. In this study, we performed chemical mutagenesis of two water surface-floating microalgae to elevate productivity. Floating microalgal strains AVFF007 and FFG039 (tentatively identified as Botryosphaerella sp. and Chlorococcum sp., respectively) were exposed to ethyl methane sulfonate (EMS) or 1-methyl-3-nitro-1-nitrosoguanidine (MNNG), and pale green mutants (PMs) were obtained. The most promising FFG039 PM formed robust biofilms on the surface of the culture medium, similar to those formed by wild type strains, and it exhibited 1.7-fold and 1.9-fold higher biomass and lipid productivities than those of the wild type. This study indicates that the chemical mutation strategy improves the lipid productivity of water surface-floating microalgae without inhibiting biofilm formation and floating ability. View Full-Text
Keywords: chemical mutagenesis; microalgae; biofuels; lipid production; water surface-floating chemical mutagenesis; microalgae; biofuels; lipid production; water surface-floating

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Nojima, D.; Ishizuka, Y.; Muto, M.; Ujiro, A.; Kodama, F.; Yoshino, T.; Maeda, Y.; Matsunaga, T.; Tanaka, T. Enhancement of Biomass and Lipid Productivities of Water Surface-Floating Microalgae by Chemical Mutagenesis. Mar. Drugs 2017, 15, 151.

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