Lipid accumulation and CO 2 utilization of two marine oil-rich microalgal strains in response to CO 2 aeration
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Lipid accumulation and CO2 utilization of two marine oil-rich microalgal strains in response to CO2 aeration WANG Shuai1, ZHENG Li1, 2*, HAN Xiaotian3, YANG Baijuan1, LI Jingxi1, SUN Chengjun1 1 Key Laboratory for Marine Bioactive Substances and Modern Analytical Technology, the First Institute of
Oceanography, State Oceanic Administration, Qingdao 266061, China 2 Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and
Technology, Qingdao 266071, China 3 Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of
Sciences, Qingdao 266071, China Received 4 May 2017; accepted 9 June 2017 ©The Chinese Society of Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2018
Abstract
Biological CO2 sequestration by microalgae is a promising and environmentally friendly technology applied to sequester CO2. The characteristics of neutral lipid accumulation by two marine oil-rich microalgal strains, namely, Isochrysis galbana and Nannochloropsis sp., through CO2 enrichment cultivation were investigated in this study. The optimum culture conditions of the two microalgal strains are 10% CO2 and f medium. The maximum biomass productivity, total lipid content, maximum lipid productivity, carbon content, and CO2 fixation ability of the two microalgal strains were obtained. The corresponding parameters of the two strains were as follows: ((142.42±4.58) g/(m 2 ·d), (149.92±1.80) g/(m 2 ·d)), ((39.95±0.77)%, (37.91±0.58)%), ((84.47±1.56) g/(m 2 ·d), (89.90±1.98) g/(m2·d)), ((45.98±1.75)%, (46.88±2.01)%), and ((33.74±1.65) g/(m2·d), (34.08±1.32) g/(m2·d)). Results indicated that the two marine microalgal strains with high CO2 fixation ability are potential strains for marine biodiesel development coupled with CO2 emission reduction. Key words: Isochrysis galbana, Nannochloropsis sp., CO2 enrichment cultivation, neutral lipid, biodiesel, open raceway pond Citation: Wang Shuai, Zheng Li, Han Xiaotian, Yang Baijuan, Li Jingxi, Sun Chengjun. 2018. Lipid accumulation and CO2 utilization of two marine oil-rich microalgal strains in response to CO2 aeration. Acta Oceanologica Sinica, 37(2): 119–126, doi: 10.1007/s13131-018-1171-y
1 Introduction The CO2 concentration in the atmosphere continuously increases; as a consequence, this increase significantly affects the global environment. Extensive CO2 emissions from anthropogenic activities cause global warming (Ramanan et al., 2010). These emissions can be reduced through biological CO2 sequestration by using photosynthetic microalgae because these organisms unlikely compete with food crops for arable land and fresh water resources (Kumar et al., 2010). Cultivated microalgae not only exhibit high CO 2 fixation ability but also produce significant amounts of renewable biomass for biofuels. These organisms also yield value-added products from biomass, such as proteins, fatty acids, and dietary supplements for humans, animals and fish (Pulz and Gross, 2004). Studies on carbon seques
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