Cultivation of oleaginous Rhodotorula mucilaginosa in airlift bioreactor by using seawater

The enormous water resource consumption is a concern to the scale-up fermentation process, especially for those cheap fermentation commodities, such as microbial oils as the feedstock for biodiesel production. The direct cultivation of oleaginous Rhodotorula mucilaginosa in a 5-L airlift bioreactor...

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Bibliographic Details
Published in:Journal of bioscience and bioengineering 2016-02, Vol.121 (2), p.209-212
Main Authors: Yen, Hong-Wei, Liao, Yu-Ting, Liu, Yi Xian
Format: Article
Language:English
Subjects:
Airlift bioreactors
Biofuels - supply & distribution
Biomass
Bioreactors
Fermentation
Linoleic Acid - analysis
Lipids - analysis
Microbial oils
Oleaginous
Oleic Acid - analysis
Osmotic Pressure
Palmitic Acid - analysis
Rhodotorula - chemistry
Rhodotorula - growth & development
Salinity
Seawater
Seawater - microbiology
Time Factors
Water Microbiology
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Summary:The enormous water resource consumption is a concern to the scale-up fermentation process, especially for those cheap fermentation commodities, such as microbial oils as the feedstock for biodiesel production. The direct cultivation of oleaginous Rhodotorula mucilaginosa in a 5-L airlift bioreactor using seawater instead of pure water led to a slightly lower biomass being achieved, at 17.2 compared to 18.1 g/L, respectively. Nevertheless, a higher lipid content of 65 ± 5% was measured in the batch using seawater as compared to the pure water batch. Both the salinity and osmotic pressure decreased as the cultivation time increased in the seawater batch, and these effects may contribute to the high tolerance for salinity. No effects were observed for the seawater on the fatty acid profiles. The major components for both batches using seawater and pure water were C16:0 (palmitic acid), C18:1 (oleic acid) and C18:2 (linoleic acid), which together accounted for over 85% of total lipids. The results of this study indicated that seawater could be a suitable option for scaling up the growth of oleaginous R. mucilaginosa, especially from the perspective of water resource utilization.
ISSN:1389-1723
1347-4421
DOI:10.1016/j.jbiosc.2015.06.007