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Article

Hemicellulosic Bioethanol Production from Fast-Growing Paulownia Biomass

1
Technological Centre of Multisectorial Research (CETIM), Business Park of Alvedro, 15181 Culleredo, Spain
2
Department of Chemical Engineering, Faculty of Science, Universidade de Vigo, Campus Ourense, As Lagoas, 32004 Ourense, Spain
3
CEB-Centre of Biological Engineering, Campus of Gualtar, University of Minho, 4710 057 Braga, Portugal
*
Author to whom correspondence should be addressed.
Processes 2021, 9(1), 173; https://doi.org/10.3390/pr9010173
Received: 29 December 2020 / Revised: 12 January 2021 / Accepted: 14 January 2021 / Published: 19 January 2021
(This article belongs to the Special Issue Bioethanol Production Processes)
In order to exploit a fast-growing Paulownia hardwood as an energy crop, a xylose-enriched hydrolysate was obtained in this work to increase the ethanol concentration using the hemicellulosic fraction, besides the already widely studied cellulosic fraction. For that, Paulownia elongata x fortunei was submitted to autohydrolysis treatment (210 °C or S0 of 4.08) for the xylan solubilization, mainly as xylooligosaccharides. Afterwards, sequential stages of acid hydrolysis, concentration, and detoxification were evaluated to obtain fermentable sugars. Thus, detoxified and non-detoxified hydrolysates (diluted or not) were fermented for ethanol production using a natural xylose-consuming yeast, Scheffersomyces stipitis CECT 1922, and an industrial Saccharomyces cerevisiae MEC1133 strain, metabolic engineered strain with the xylose reductase/xylitol dehydrogenase pathway. Results from fermentation assays showed that the engineered S. cerevisiae strain produced up to 14.2 g/L of ethanol (corresponding to 0.33 g/g of ethanol yield) using the non-detoxified hydrolysate. Nevertheless, the yeast S. stipitis reached similar values of ethanol, but only in the detoxified hydrolysate. Hence, the fermentation data prove the suitability and robustness of the engineered strain to ferment non-detoxified liquor, and the appropriateness of detoxification of liquor for the use of less robust yeast. In addition, the success of hemicellulose-to-ethanol production obtained in this work shows the Paulownia biomass as a suitable renewable source for ethanol production following a suitable fractionation process within a biorefinery approach. View Full-Text
Keywords: hemicellulosic ethanol; fast-growing species; inhibitors; industrial yeast; xylose fermentation; Scheffersomyces stipitis; Saccharomyces cerevisiae hemicellulosic ethanol; fast-growing species; inhibitors; industrial yeast; xylose fermentation; Scheffersomyces stipitis; Saccharomyces cerevisiae
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MDPI and ACS Style

Domínguez, E.; Río, P.G.d.; Romaní, A.; Garrote, G.; Domingues, L. Hemicellulosic Bioethanol Production from Fast-Growing Paulownia Biomass. Processes 2021, 9, 173. https://doi.org/10.3390/pr9010173

AMA Style

Domínguez E, Río PGd, Romaní A, Garrote G, Domingues L. Hemicellulosic Bioethanol Production from Fast-Growing Paulownia Biomass. Processes. 2021; 9(1):173. https://doi.org/10.3390/pr9010173

Chicago/Turabian Style

Domínguez, Elena, Pablo G.d. Río, Aloia Romaní, Gil Garrote, and Lucília Domingues. 2021. "Hemicellulosic Bioethanol Production from Fast-Growing Paulownia Biomass" Processes 9, no. 1: 173. https://doi.org/10.3390/pr9010173

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