Exploring low-cost carbon sources for microbial lipids production by fed-batch cultivation of Cryptococcus albidus Authors
First Online: 30 December 2011 Received: 20 October 2010 Revised: 28 November 2010 Accepted: 30 November 2010 DOI:
Cite this article as: Fei, Q., Chang, H.N., Shang, L. et al. Biotechnol Bioproc E (2011) 16: 482. doi:10.1007/s12257-010-0370-y Abstract
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. Keywords microbial lipids production Cryptococcus albidus low-cost carbon source two-stage cultivation oxygen-enriched air supply biodiesel References
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