Mixotrophic Cultivation of Dunaliella salina on Crude Glycerol Obtained from Calcinated Fatty Acid Production Process
- Authors: Sohrabi D.1, Jazini M.H.1, Shariati M.2
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Affiliations:
- Department of Chemical Engineering, Isfahan University of Technology
- Department of Biology, University of Isfahan
- Issue: Vol 45, No 6 (2019)
- Pages: 470-480
- Section: Article
- URL: https://journals.rcsi.science/1063-0740/article/view/184489
- DOI: https://doi.org/10.1134/S1063074019060105
- ID: 184489
Cite item
Abstract
Dunaliella salina is a unicellular microalga with the potential of industrial applications. Commercial-scale cultivation of D. salina requires extensive efforts on cost reduction. This can be achieved by minimization of nutrient cost and maximization of specific growth rate and productivity. To this end, in this study, mixotrophic cultivation of D. salina on crude glycerol (by-product of calcinated-fatty acid (CaFA) production process) was investigated in shake flasks and the influences on protein, carotenoid and chlorophyll contents of the cells were studied. The highest maximum specific growth rate and biomass productivity was achieved by cultivation on 2.5 g/L crude glycerol. The protein content was more than two folds and the carotenoid content was more than 60% higher than that of autotrophic cultivation. Subsequently, continuous cultivation of D. salina on crude glycerol in a helical photobioreactor was performed at the dilution rate of 0.52/d. The biomass productivity of 2.3 × 106 cell/(mL d) was achieved which was more than 75% of the values for previously reported autotrophic cultivations. Conclusively, continuous cultivation of D. salina on by-product of CaFA production process could be a potential process technology for production of D. Salina.
About the authors
D. Sohrabi
Department of Chemical Engineering, Isfahan University of Technology
Email: m.h.jazini@cc.iut.ac.ir
Iran, Islamic Republic of, Isfahan, 84156-83111
M. H. Jazini
Department of Chemical Engineering, Isfahan University of Technology
Author for correspondence.
Email: m.h.jazini@cc.iut.ac.ir
Iran, Islamic Republic of, Isfahan, 84156-83111
M. Shariati
Department of Biology, University of Isfahan
Email: m.h.jazini@cc.iut.ac.ir
Iran, Islamic Republic of, Isfahan