Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 9, Issue 4, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.105482
Keywords
Microalgae; Mixotrophy; Organic carbon; Acetate; Lipids; Biodiesel
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Funding
- King Saud University, Riyadh, Saudi Arabia [RSP-2021/5]
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The study found that mixotrophic cultivation of Chlorella vulgaris can increase biomass yield, lipid content and fatty acid composition, with the best results achieved at specific concentrations of acetate and dextrose.
Phototrophic and mixotrophic cultivation of C. vulgaris for ameliorating biomass yield, lipid content, neutral lipid content and fatty acid composition was investigated. Phototrophic cultivation of C. vulgaris produced 1.28 g/L dry cell weight and 15.3% lipid content on day 18 whereas in mixotrophic mode of cultivation, acetate at 0.4% has yielded higher dry cell weight of 2.7 g/L and 20.8% lipids compared to dextrose and bicarbonate. Central composite design (CCD) based optimization showed combined supplementation of 0.4% acetate + 0.6% dextrose has accumulated higher lipid content of 27% and 69% neutral lipid compared to acetate + bicarbonate, and dextrose + bicarbonate conditions. Further, fatty acid composition of acetate + dextrose supplemented cells possessed high levels of C16:0, C16:1 and C18:1, which makes mixotrophically cultivated C. vulgaris for pilot-scale production.
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