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| Effect of different salinity on the lipid synthesis and biofuel production of two Dunaliella strains |
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| DOI：10.19902/j.cnki.zgyz.1003-7969.240208 |
| KeyWord:Dunaliella salinity lipid fatty acid biofuel |
| FundProject:国家自然科学基金（42177459）；江苏省大学生创新创业训练计划（202311117097Y） |
| Author Name | Affiliation | | WU Zhixin, ZENG Yulin, CHEN Cheng, YU Qiuyan,
LIU Qing, ZHOU Xiaojian, JIN Cuili | College of Environmental Science and Engineering, Yangzhou University,
Yangzhou 225127, Jiangsu, China |
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| Abstract: |
| In order to screen out high quality algae species for biofuel production, different salinities were used to cultivate D.bardawil and D.salina to analyze the effects of salinity on the growth, biomass synthesis and performance of the two species of Dunaliella for biodiesel production. The results showed that the optimum salinity for the growth and biomass accumulation of both Dunaliella strains was low salinity of 15-30 g/L. D.bardawil and D.salina obtained the highest specific growth rates of 0.18 d-1 and 009 d-1 at a salinity of 30 g/L, respectively. The highest biomass, lipid content, and carbohydrate content of 1 716.67 mg/L and 494.85 mg/L, 344.75 mg/L and 107.75 mg/L, and 65160 mg/L and 130.52 mg/L, respectively, were found in both strains of D.bardawil and D.salina at a salinity of 15 g/L. The fatty acid composition of the lipids of the two strains of Dunaliella differed, but both were dominated by α-linolenic acid. The salinity of 15-30 g/L improved the combustion performance and oxidation stability of biodiesel produced from two strains at the cost of the slight loss of the low-temperature fluidity. In conclusion, the halotolerant nature of Dunaliella species enables efficient biofuel synthesis in hypersaline aquatic environments. D.bardawil emerges as a prime algal candidate for hypersaline-adapted biofuel production due to its higher biomass, lipid content, carbohydrate content, low-temperature fluidity of biodiesel as well as its adaptability to salinity compared to those of D.salina. |
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