Abstract
Biodiesel production from microalgae is considered a sustainable alternative to fossil fuel sources. The economic feasibility of algae-based biodiesel is highly related to biomass, lipid and FAME yield of the species. Thus, optimization of the culture conditions plays an important role in biodiesel production. The aim of this study is to compare lipid and FAME yield and biodiesel quality of two green algae species, Chlorella vulgaris, and Botryococcus sudeticus, under nitrogen deficiency conditions. For this purpose, algae species were cultured under optimum conditions until the stationary phase, then in the second phase the effect of nitrogen stress on total lipid, FAME content, and biodiesel quality were assessed. Although nitrogen-deficiency had negative impact on the growth and survival of both species, complete nitrogen removal from the medium stimulated the total lipid and FAME yield and the level of enhancement varied among species. FAME yield increased by 21% in B. sudeticus and 28% in C. vulgaris cultures under nitrogen deficiency conditions. The biodiesel properties of both cultures met European standards, on the other hand the absence of nitrogen did not reveal a significant effect on the cetane number values of C. vulgaris. However, it caused a reduction in B. sudeticus cultures. Nitrogen deficiency had a negative impact on the oxidative stability of B. sudeticus, reducing its ability to resist oxidation. However, it enhanced the oxidative stability of C. vulgaris in long-term storage. The results highlighted the importance of species-specific approaches to maximize both lipid content and biodiesel quality.
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Abbreviations
- ANOVA:
-
Analysis of variance
- ASTM:
-
American Society for Testing and Materials
- CN:
-
Cetane number
- CFPP:
-
Cold flow plugging properties
- Chl-a :
-
Chlorophyll-a
- DU:
-
Degree of unsaturation
- FA:
-
Fatty Acid
- FAME:
-
Fatty acid methyl ester
- IV:
-
Iodine value
- LCSF:
-
Long chain saturated factors
- MUFAs:
-
Monounsaturated fatty acids
- SFAS :
-
Saturated fatty acids
- PUFAs:
-
Polyunsaturated fatty acid
- SV:
-
Saponification value
- Acyl CoA:
-
Diacylglycerol acyltransferase
- wt%:
-
Weight percentage (%)
- DW:
-
Dry weight percentage (%)
- UTEX:
-
Culture Collection of Algae at the University of Texas at Austin
- CCAP:
-
Culture collection of algae and protozoa
- FID:
-
Flame ionization detector
- GC:
-
Gas chromatography
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Acknowledgements
We would like to thank Dr. Zeynep DORAK for her help in statistical analysis, and Dr. Cenk Gürevin, and Cansu Atar for their technical support in the laboratory.
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This study was funded by Scientific Research Projects Coordination Unit of Istanbul University (Project number: 36334).
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Oğuz, A., Köker, L., Ozbayram, E.G. et al. Biodiesel Production from Botryococcus sudeticus and Chlorella vulgaris: Assessment of Nitrogen Deficiency on Lipid, Fame Yield and Biodiesel Properties. Waste Biomass Valor 15, 2757–2768 (2024). https://doi.org/10.1007/s12649-023-02359-2
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DOI: https://doi.org/10.1007/s12649-023-02359-2