Exploring low-cost carbon sources for microbial lipids production by fed-batch cultivation of Cryptococcus albidus

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Volatile fatty acids (VFAs), acetic acid, acetates, and ethanol were used as carbon sources for the production of microbial lipids using Cryptococcus albidus in batch cultures. C. albidus utilized organic acids less than glucose in the production of lipids, resulting in a lipid yield coefficient on VFAs of 0.125 g/g. In a two-stage batch culture, the lipid content increased to 43.8% (w/w) when VFAs were used as the sole carbon source in the second stage, which was two times higher than that of the batch culture. Furthermore, a 192 h, two-stage fed-batch cultivation of C. albidus produced a dry cell weight, lipid concentration, and lipid content of 26.4 g/L, 14.5 g/L, and 55.1% (w/w), respectively. The fed-batch culture model used in this study featured pure VFA solutions, with intermittent feeding, under oxygen-enriched air supply conditions. This study investigated several alternative carbon sources to reduce the cost of microbial lipids production and proved the feasibility of using VFAs as the carbon source for the provision of a high lipid content and productivity.
Publisher
Korean Soc Biotechnology & Bioengineering
Issue Date
2011-06
Language
English
Article Type
Article
Keywords

BIODIESEL PRODUCTION; DENSITY CULTIVATION; CULTURE; MICROORGANISMS; FERMENTATION; GROWTH; OXYGEN; BIOREACTORS; CHEMICALS; BIOMASS

Citation

BIOTECHNOLOGY AND BIOPROCESS ENGINEERING, v.16, no.3, pp.482 - 487

ISSN
1226-8372
URI
http://hdl.handle.net/10203/95616
Appears in Collection
CBE-Journal Papers(저널논문)
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