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Chlorella vulgaris cultivation with an additive of magnesium-aminoclay

Farooq, Wasif, Lee, Hyun Uk, Huh, Yun Suk, Lee, Young-Chul
Algal research 2016 v.17 pp. 211-216
Chlorella vulgaris, biodiesel, carbon dioxide, fuel production, harvesting, lipid content, lipids, microalgae, oils, reactive oxygen species
In integral microalgal biofuel production consisting of microalgal culturing, harvesting, lipid (oil) extraction, oil-to-biodiesel conversion and biodiesel quality improvement, cultivation to improve lipid (oil) content in microalgal cells without inducement of transformants is a booming field of experimentation and application. In the present study, water-solubilized, transparent and cationic-charged and clustered magnesium-aminoclay (MgAC) was utilized as a co-additive in Chlorella vulgaris cultivation. The MgAC effected both an increase of cell size (from ~3.524μm to ~4.175μm size) with low cell density (from 1260×106cells/mL to 511×106cells/mL) and an increase of total lipid content without microalgal cell transformation according to various MgAC loadings (0, 0.25, 0.50, and 1.0g/L) at the 2.0% CO2 supply. The cationic-charged MgAC clusters wrapped the microalgal cells to create a stressful microenvironment, increasing the intracellular reactive oxygen species (ROS) content. Therefore, additive-MgAC-based microalgal cultivation is herein suggested in a novel microalgal biofuel production.