Production of microbial lipid by Cryptococcus curvatus on rice straw hydrolysates

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Microbial biolipids/biodiesels derived from volatile fatty acids (VFAs) can be a valuable alternative to plant oils if optimum fermentation conditions are determined. VFAs were used for cell mass and microbial lipid production by Cryptococcus curvatus. The lipid content in the cells increased up to 48% and 28% in batch cultures with the use of 20 g/L glucose and 6 g/L of VFAs as the carbon source, respectively. In this study, C. curvatus used VFAs as a carbon source via anaerobic digestion of rice straw hydrolysates. VFAs produced from rice straw resulted in yield of 0.43 g VFAs/g substrate and 40% higher specific growth rate(0.305 h(-1)) than synthetic VFAs. The highest fatty acid composition observed was C18:1, was obtained using glucose and VFAs as the carbon source to yield a cetane number of 56-59, which is suitable for biodiesel production. The cost of microbial lipids was estimated to be 0.30-1.15 USD/L given 0-150 USD/ton of VFAs cost for a yield of 0.17 g/g of lipids. Thus, VFAs can be a suitable carbon source for economical biodiesel production. (C) 2017 Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2017-05
Language
English
Article Type
Article
Keywords

VOLATILE FATTY-ACIDS; HIGH-CELL-DENSITY; OLEAGINOUS YEAST; BIODIESEL FUEL; OIL PRODUCTION; CARBON-SOURCES; CETANE NUMBER; FOOD WASTE; CULTIVATION; MICROORGANISMS

Citation

PROCESS BIOCHEMISTRY, v.56, pp.147 - 153

ISSN
1359-5113
DOI
10.1016/j.procbio.2017.02.020
URI
http://hdl.handle.net/10203/224097
Appears in Collection
CBE-Journal Papers(저널논문)
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