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Production of lipid and carbohydrate from microalgae without compromising biomass productivities: Role of Ca and Mg

机译：从微藻类生产脂质和碳水化合物而不损害生物质生产力：钙和镁的作用

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We report the cultivation of Chlorella sorokiniana str. SLA-04 in media containing trace amounts of Ca and Mg. The differences in productivities of biomass, lipids and carbohydrates were assessed relative to cultures grown in standard media (BG-11) that contain approximately 8 x higher concentration of Ca and 30 x higher concentration of Mg. Culture performance in N-limited standard media was also investigated. In addition to growth and accumulation of storage products (lipid and carbohydrate), we measured the utilization of N, Ca and Mg and monitored changes in cell size and photosynthetic activity. Our results showed that limitation of Ca or Mg did not inhibit cell replication and culture growth. On the contrary, Ca-limited (Ca-L) cultures had similar to 30% higher biomass productivity relative to the control with excessive nutrients possibly due to improvement in cell wall flexibility and cell division. We also observed that Ca-L and Mg-limited (Mg-L) cultures had nearly 3-fold higher lipid concentration (measured as fatty acid methyl ester) and 50% higher carbohydrate concentration than the nutrient excess control cultures. Simultaneous culture growth and lipid accumulation in Ca-L and Mg-L cultures suggest that de novo synthesis was the primary mechanism for lipid accumulation in Ca/Mg-limited media. Overall, our study demonstrates that micronutrient optimization, in addition to optimization of macronutrients, could significantly improve microalgal biorefinery yields. (C) 2018 Elsevier Ltd. All rights reserved.
机译：我们报告了小球藻小球藻的培养。含有痕量Ca和Mg的培养基中的SLA-04。相对于在含有大约8倍高浓度的Ca和30倍高浓度的Mg的标准培养基（BG-11）中生长的培养物，评估了生物量，脂质和碳水化合物的生产力差异。还研究了在N受限标准培养基中的培养性能。除了存储产品（脂质和碳水化合物）的生长和积累，我们还测量了氮，钙和镁的利用率，并监测了细胞大小和光合作用活性的变化。我们的结果表明，限制钙或镁不会抑制细胞复制和培养物的生长。相反，限钙（Ca-L）培养相对于具有过量营养物的对照，生物量生产率提高了30％，这可能是由于细胞壁柔韧性和细胞分裂的改善所致。我们还观察到，与营养过量的对照培养物相比，Ca-L和Mg受限（Mg-L）培养物的脂质浓度（以脂肪酸甲酯计）高出近3倍，碳水化合物浓度高出50％。在Ca-L和Mg-L培养物中同时培养物生长和脂质积累表明，从头合成是Ca / Mg受限培养基中脂质积累的主要机制。总体而言，我们的研究表明，除了优化大量营养素外，微量营养素优化还可以显着提高微藻生物精炼厂的产量。 （C）2018 Elsevier Ltd.保留所有权利。

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