Using a trait-based approach to optimize mixotrophic growth of the red microalga Porphyridium purpureum towards fatty acid production

• Published in: Biotechnology for biofuels Vol. 11; no. 1; p. 273
• Main Authors: Jiao, Kailin, Xiao, Wupeng, Xu, Yuanchao, Zeng, Xianhai, Ho, Shih-Hsin, Laws, Edward A, Lu, Yinghua, Ling, Xueping, Shi, Tuo, Sun, Yong, Tang, Xing, Lin, Lu
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 04.10.2018; BioMed Central; BMC
• Subjects: Accumulation; Acetic acid; Acid production; Algae; Arachidonic acid; Biodiesel fuels; Biomass; Carbon; Carbon sources; Cell growth; Chemical properties; Cultivation; Culture media; Dosage; Eicosapentaenoic acid; Fatty acid synthesis; Fatty acids; Generalized additive models; Glucose; Glycerol; Growth; Lipids; Measurement; Optimization; Organic carbon; Porphyridium purpureum; Red algae; Sodium; Sodium acetate; Studies; Substrates; Trait-based approach; New York; Organic carbon; Porphyridium purpureum; Trait-based approach; Arachidonic acid; Generalized additive models
• ISSN: 1754-6834; 1754-6834
• DOI: 10.1186/s13068-018-1277-7

Organic carbon sources have been reported to simultaneously increase the growth and lipid accumulation in microalgae. However, there have been no studies of the mixotrophic growth of in organic carbon media. In this study, three organic carbon sources, glucose, sodium acetate, and glycerol were used as substrates for the mixotrophic growth of . Moreover, a novel trait-based approach combined with Generalized Additive Modeling was conducted to determine the dosage of each organic carbon source that optimized the concentration of cell biomass or fatty acid. A 0.50% ( / ) dosage of glucose was optimum for the enhancement of the cell growth of , whereas sodium acetate performed well in enhancing cell growth, arachidonic acid (ARA) and eicosapentaenoic acid (EPA) content, and glycerol was characterized by its best performance in promoting both cell growth and ARA/EPA ratio. The optimum dosages of sodium acetate and glycerol for the ARA concentration were 0.25% ( / ) and 0.38% ( / ), respectively. An ARA concentration of 211.47 mg L was obtained at the optimum dosage of glycerol, which is the highest ever reported. The results suggested that a comprehensive consider of several traits offers an effective strategy to select an optimum dosage for economic and safe microalgae cultivation. This study represents the first attempt of mixotrophic growth of and proved that both biomass and ARA accumulation could be enhanced under supplements of organic carbon sources, which brightens the commercial cultivation of microalgae for ARA production.