Microbial oil produced from biodiesel by-products could enhance overall production

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2013-02-01

Author

Kiran, Esra Uckun
Trzcinski, Antoine
Webb, Colin

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Glycerol and rapeseed meal, two major by-products of biodiesel production, have been tested for possible use as low-cost raw materials for the production of microbial bio-oil using the oleaginous yeast Rhodosporidium toruloides. Using fed-batch fermentation with crude glycerol and a novel nitrogen rich nutrient source derived from rapeseed meal as feed, it was shown that 13 g/L lipids could be produced, compared with 9.4 g/L when crude glycerol was used with yeast extract. When 100 g/L pure glycerol was used, the final lipid concentration was 19.7 g/L with the novel biomedium compared to 16.2 g/L for yeast extract. The novel biomedium also resulted in higher lipid yields (0.19 g lipid/g glycerol consumed compared to 0.12 g/L) suggesting it provides a better carbon to nitrogen balance for accumulating lipids. FAMEs produced from the microbial lipids indicated a high degree of unsaturation confirming that the fatty acids produced from the novel biomedium have potential for biodiesel production.

Subject Keywords

Solid state fermentation, Crude glycerol, Rapeseed meal, Microbial bio-oil, Biodiesel

URI

https://hdl.handle.net/11511/66388

Journal

BIORESOURCE TECHNOLOGY

DOI

https://doi.org/10.1016/j.biortech.2012.11.152

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

E. U. Kiran, A. Trzcinski, and C. Webb, “Microbial oil produced from biodiesel by-products could enhance overall production,” BIORESOURCE TECHNOLOGY, pp. 650–654, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/66388.