Volatile fatty acids from lipid-extracted yeast provide additional feedstock for microbial lipid production

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Microbial lipid production from oleaginous yeasts is a promising process for the sustain-able development of the microbial biodiesel industry. However, the feedstock cost poses an eco-nomic problem for the production of microbial biodiesel. After lipid extraction, yeast biomass can be used as an organic source for microbial biodiesel production. In this study, volatile fatty acids (VFAs), produced via anaerobic digestion of a lipid-extracted yeast (LEY) residue, were utilized as a carbon source for the yeast Cryptococcus curvatus. The response surface methodology was used to determine the initial pH and inoculum volume for the optimal VFA production. The experimental result for VFA concentration was 4.51 g/L at an initial pH of 9 and an inoculation 25%. The optimization results from the response surface methodology showed that the maximal VFA concentration was 4.58 g/L at an initial pH of 8.40 and an inoculation of 39.49%. This study indicates that VFAs from LEY can be used as a carbon source for microbial biodiesel production, with the potential to significantly reduce feedstock costs. © 2021 by the authors. Li-censee MDPI, Basel, Switzerland.
Publisher
Multidisciplinary Digital Publishing Institute (MDPI)
Issue Date
2021-08
Language
English
Article Type
Article
Citation

Catalysts, v.11, no.8

ISSN
2073-4344
DOI
10.3390/catal11081009
URI
http://hdl.handle.net/10203/291001
Appears in Collection
CBE-Journal Papers(저널논문)
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