Isochrysis sp. IOAC724S,a newly isolated,lipid-enriched,marine microalga for lipid production,and optimized cultivation conditions |
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| Affiliation: | 1. Microbial Biotechnology Department, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran;2. Department of Food Biotechnology, Branch for Northwest & West Region, Agricultural Biotechnology Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Tabriz, Iran;1. CCMar — Centre of Marine Sciences, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal;2. CEOT — Centro de Electrónica, Optoelectrónica e Telecomunicações, Campus de Gambelas, 8005-139 Faro, Portugal;3. CACYTMAR — Centro Andaluz de Ciencia y Tecnología Marinas, University of Cádiz, Campus Universitario de Puerto Real, Cádiz, Spain;1. Interdisciplinary Centre of Marine and Environmental Research (CIIMAR/CIMAR), University of Porto, Porto, Portugal;2. University of Porto, Department of Biology, Faculty of Sciences, Porto, Portugal;3. University of Porto, Department of Chemical Engineering, Porto, Portugal;4. LEPABE—Laboratory of Process Engineering, Environment, Biotechnology and Energy, Porto, Portugal |
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| Abstract: | An oleaginous, unicellular, marine microalga termed IOAC724S was isolated from the South China Sea. Morphology and genetic analyses indicated it belongs to the genus Isochrysis. Gas chromatography (GC) results showed that more than 10 types of fatty acids existed in Isochrysis sp. IOAC724S and that 90% of them were suitable for lipid production. The culture conditions suitable for cell growth were progressively optimized through photosynthetic and respiratory analyses. The optimal culture conditions were: photon flux 200–500 μmol m−2 s−1, temperature 35 °C during daytime and 24 °C at night, pH value between 7 and 8, NaNO3 160 g m−3 and NaH2PO4·2H2O 80 g m−3 for starting culture. When microalgal cultures were exposed to these optimal conditions, the specific growth rate reached to 0.26 d−1 on average and 1.0 d−1 in MAX. Lipid production was optimized through nutrient starvation processes, including nitrate or phosphate deprivation and simultaneous nitrate and phosphate deprivation. The highest lipid mass fraction of dry cell weight (about 55.6%) was obtained after the stationary phase algal culture was transferred into phosphate-free medium for 3 days. GC data demonstrated that the enhancement of lipid accumulation in algal cells maintained under nutrient starvation came mainly from an increase of C16:0 and C18:1 fatty acids; however, the lipids with a chain length appropriate for fuel use (C14 to C18) were unchanged at 90% mass fraction of the dry cell weight. Based on these good characteristics, Isochrysis sp. IOAC724S appeared to be a strong candidate for lipid production. |
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| Keywords: | Marine microalgae High temperature tolerance Fatty acid Lipid Optimization |
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