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Quantitative Study on Lipid Productivity of Euglena gracilis and its Biodiesel Production according to the Cultivation Conditions
Journal of Cleaner Production ( IF 11.1 ) Pub Date : 2020-11-19 , DOI: 10.1016/j.jclepro.2020.125218
Jong-Min Jung , Jee Young Kim , Sungyup Jung , Yoon-E Choi , Eilhann E. Kwon

Biodiesel is a carbon neutral liquid fuel that is derived from transesterification of lipids in biomass. Microalgae could be a promising raw feedstock for biodiesel production thanks to high lipid content in line with the rapid carbon fixation capability. Nonetheless, lipid productivity from microalgae is sensitive to microalgal species and cultivation conditions. Hence, to seek cultivation parameters maximizing lipid productivity, Euglena gracilis (E. gracilis) was kept under the controlled conditions as a case study. Non-catalytic transesterification was also adopted for quantitative/qualitative analyses of lipid in E. gracilis due to its analytical reliability. E. gracilis was cultured in the aerobic condition for 7 d, and the cultivation mode was changed into the anaerobic condition for 3 d to experimentally confirm wax ester fermentation mechanisms. The lipid content in E. gracilis reached up to 24.81 wt.% (dry basis) under the heterotrophic condition, which was in good agreement with the wax fermentation mechanism. It was concluded that the high dose of nutrients (glucose, nitrogen, and phosphorus) under the oxygen-free environment led to a favorable condition for lipid accumulation. Nevertheless, this study offered that lipid productivity in 6 d (0.131 g lipid L-1 d-1) under aerobic condition was higher than that in 10 d (0.092 g lipid L-1 d-1) under anaerobic condition due to substantial carbon loss arising from the wax ester fermentation stage under the anaerobic condition.



中文翻译:

栽培条件下细叶裸藻脂质产生能力及其生物柴油产量的定量研究

生物柴油是一种碳中性的液体燃料,源自生物质中脂质的酯交换反应。由于高脂类含量以及快速的碳固定能力,微藻类可能成为生物柴油生产的有前途的原料。尽管如此,微藻的脂质生产率对微藻种类和培养条件敏感。因此,为了寻求最大程度提高脂质产量的栽培参数,将Euglena gracilisE. gracilis)保持在受控条件下作为案例研究。非催化酯交换反应还通过了脂质的定量/定性分析眼虫由于其分析的可靠性。细肠埃希菌将其在需氧条件下培养7 d,将培养模式改变为厌氧条件3 d,以实验证实蜡酯的发酵机理。在脂质含量小眼虫的异养条件,这是在与蜡发酵机构良好的一致性下最多时达到24.81%(重量)(干基)。结论是在无氧环境下高剂量的营养物质(葡萄糖,氮和磷)为脂质积累提供了有利条件。尽管如此,这项研究提供了有氧条件下6 d(0.131 g脂质L -1 d -1)的脂质生产率高于10 d(0.092 g脂质L -1 d)-1)在厌氧条件下,由于在厌氧条件下蜡酯发酵阶段产生大量碳损失。

更新日期:2020-11-19
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