Light Intensity Improves Growth, Lipid Productivity, and Fatty Acid Profile of Chlorococcum oleofaciens (Chlorophyceae)
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Light Intensity Improves Growth, Lipid Productivity, and Fatty Acid Profile of Chlorococcum oleofaciens (Chlorophyceae) for Biodiesel Production Marzie Rayati 1 & Houman Rajabi Islami 1
&
Mehdi Shamsaie Mehrgan 1
# Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The present study was aimed to consider the effect of light intensity on the growth and lipid accumulation properties of a freshwater microalga Chlorococcum oleofaciens KF584224.1. The microalga was cultivated at five different light intensities of 50, 100, 200, 400, and 800 μmol photons m−2 s−1 for 20 days. The culture curves illustrated the fastest growth rate for microalgae illuminated with 200 μmol photons m−2 s−1, while the longest exponential growth curve was obtained in culture illuminated with 400 μmol photons m−2 s−1. Once algae reached the stationary phase, the maximum biomass productivity (367.82 ± 21.63 mg L−1 day−1) was found in culture illuminated with 200 μmol photons m−2 s−1, while the highest lipid content (59.18 ± 1.62%) and lipid productivity (126.72 ± 3.27 mg L−1 day−1) were achieved in culture illuminated with 400 μmol photons m−2 s−1. The ratio of saturated fatty acids significantly increased with enhancing light illumination, while the ratio of monounsaturated fatty acids and polyunsaturated fatty acids tend to decline (p < 0.05). The properties of biodiesel obtained from C. oleofaciens cultured under 50 μmol photons m−2 s−1 met the specifications provided by the international biodiesel standards (European EN 14214 and US ASTM D6751), higher light illumination improved the biodiesel quality. Findings of the present study demonstrated that light intensity could improve the lipid productivity and biodiesel properties obtained from C. oleofaciens as a potential feedstock for biofuel production, especially under 400 μmol photons m−2 s−1 light intensity. Keywords Biofuel . Biomass . Growth . Lipid . Microalga
Introduction Microalgae are heterogeneous organisms with a vast array of distinct advantages which their cultivation has received growing attention for biodiesel production in recent years. They represent fast generation time and high photosynthetic efficiency in various environmental conditions, while no highquality arable land is required to grow the biomass [1]. Some algal species accumulate large amount of neutral lipids mainly in the form of triacylglycerols that can be readily converted into alkyl esters to obtain biodiesel and other sources of Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12155-020-10144-5) contains supplementary material, which is available to authorized users. * Houman Rajabi Islami [email protected]; [email protected] 1
Department of Fisheries, Science and Research Branch, Islamic Azad University, P.O. Box: 14515-775, Tehran, Iran
energy [2]. Microalgae can also utilize carbon dioxide, one of the major greenhouse gases with a significant cause of anthropogenic activities related to global warming, while their biomas
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