Lipid accumulation and biodiesel quality of Chlorella pyrenoidosa under oxidative stress induced by nutrient regimes

Lei Zhang, Nan Wang, Mei Yang, Ke Ding, Yong-Zhong Wang, Danqun Huo and Changjun Hou

Renewable Energy, 2019, vol. 143, issue C, 1782-1790

Abstract: In this study, effects of media compositions on the suitability of Chlorella pyrenoidosa lipids for biodiesel production were investigated. The results indicate that sulfur deficiency and excessive phosphorus resulted in significant inhibition of cell growth. Moreover, the cellular lipid content increased under nitrogen-, phosphorus- or sulfur-deficient conditions, with the maximal lipid content of 48.90% and energy conversion efficiency of 8.89% being reached under nitrogen deficient conditions. In all runs, C16 to C18 components accounted for more than 95% of the total fatty acids. In addition, several biodiesel quality parameters were calculated according to the fatty acid profile, and principal component analysis and cluster dendrogram analysis were used to evaluate the quality of the corresponding biodiesel. A high similarity of biodiesel quality under nitrogen-, phosphorus- or sulfur-deficient cultivation was observed, and the biodiesel quality was better than those obtained under other culture conditions. Additionally, a strong correlation between lipid accumulation and reactive oxygen species level was confirmed. Overall, the work indicates that the lipid content of C. pyrenoidosa increased under nitrogen-, phosphorus- or sulfur-deficient conditions and the biodiesel quality was also improved.

Keywords: Chlorella pyrenoidosa; Nutrient stress; Lipid productivity; Energy conversion efficiency; Biodiesel quality; Reactive oxygen species (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:143:y:2019:i:c:p:1782-1790

DOI: 10.1016/j.renene.2019.05.081

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