Abstract
This study was designed to assess the synergistic effects of nitrogen (N) and phosphorus (P) concentrations on oil content, fatty acid profile, and predicted fuel properties of Dunaliella salina. Axenic D. salina cells were grown in F/2 growth medium of salinity 34 ppt containing 33.6 g.l−1 ultramarine synthetic sea salt. Growth dry weight, cell count, and their relationship were measured, and oils were extracted by soaking following Soxhlet extraction. Growth dry weight was markedly affected by N and P concentrations, with maximum growth dry weights of cultures grown at recommended N and P concentrations (control), half of the recommended N concentration (0.5 N) and (0.5 N/0.5P) being 0.911 g.l−1, 0.755 g.l−1, and 0.615 g.l−1, respectively. Oil content showed the reverse pattern, with cultures grown in the absence of phosphorus (0.0P), full N/P starvation (0.0 N/0.0P), and control resulting in maximum oil contents of 24.86%, 22.85%, and 5.88%, respectively. The majority of fatty acid methyl esters ranged between C14 and C22. Estimated fuel properties of algal cells grown under NP stress conditions were found to meet the American Society for Testing and Materials (ASTM) and European Committee for Standardization (EN) guidelines.
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Abbreviations
- FAME:
-
Fatty acid methyl ester
- LCSF:
-
Long-chain saturated factor
- TAG:
-
Triacylglycerol
- DU:
-
Degree of unsaturation
- CN:
-
Cetane number
- USFA:
-
Unsaturated fatty acids
- SV:
-
Saponification value
- CFPP:
-
Cold filter plugging point
- IV:
-
Iodine value
- KV:
-
Kinematic viscosity
- SFA:
-
Saturated fatty acid
- CF:
-
Cold flow
- OS:
-
Oxidation stability
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Almutairi, A.W. Effects of nitrogen and phosphorus limitations on fatty acid methyl esters and fuel properties of Dunaliella salina. Environ Sci Pollut Res 27, 32296–32303 (2020). https://doi.org/10.1007/s11356-020-08531-8
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DOI: https://doi.org/10.1007/s11356-020-08531-8