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Rhodotorula toruloides Single Cell Oil Production Using Eucalyptus urograndis Hemicellulose Hydrolysate as a Carbon Source

1
Department of Materials and Bioprocess Engineering, School of Chemical Engineering, State University of Campinas, Campinas SP 13083-852, Brazil
2
Institute of Technology, University of Tartu, 50411 Tartu, Estonia
*
Author to whom correspondence should be addressed.
Energies 2020, 13(4), 795; https://doi.org/10.3390/en13040795
Received: 10 December 2019 / Revised: 5 February 2020 / Accepted: 7 February 2020 / Published: 12 February 2020
(This article belongs to the Section Bio-Energy)
Microbial oil is a potential substitute for vegetable oils in the biodiesel industry. Efforts to obtain cheap carbon sources for the cultivation of lipid-producing microorganisms comprise an active research area. This work aimed to extract the hemicellulose fraction from Eucalyptus uograndis and to use its hydrolysate as a carbon source for Rhodotorula toruloides (an oleaginous yeast) cultivation for microbial oil production. Hemicellulose hydrothermal extractions were performed at different temperatures, times, and ratios of solid to liquid (S/L). Temperature and time showed a stronger effect on the solubilization of hemicellulose. Hemicellulose extraction at 155 °C, 195 min, and an S/L ratio of 1/2 resulted in a hydrolysate with a xylose content of 37.0 g/l. R. toruloides cultivation in this hydrolysate showed that initial pH had a strong influence on cell growth. At an initial pH of 6.2, cells grew to 6.0 g/l of biomass with a lipid content of 50%. Therefore, we believe that E. urograndis hemicellulose hydrolysate could be a potential substrate for R. toruloides for lipid production based on the biorefinery concept. View Full-Text
Keywords: Eucalyptus urograndis; Rhodotorula toruloides; hemicellulose; hydrolysate; acetic acid; single cell oil Eucalyptus urograndis; Rhodotorula toruloides; hemicellulose; hydrolysate; acetic acid; single cell oil
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MDPI and ACS Style

Lopes, H.J.S.; Bonturi, N.; Miranda, E.A. Rhodotorula toruloides Single Cell Oil Production Using Eucalyptus urograndis Hemicellulose Hydrolysate as a Carbon Source. Energies 2020, 13, 795.

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