journal article Open Access Mar 02, 2023

Enzymatic Hydrolysis Strategies for Cellulosic Sugars Production to Obtain Bioethanol from Eucalyptus globulus Bark

Fermentation Vol. 9 No. 3 pp. 241 · MDPI AG
View at Publisher Save 10.3390/fermentation9030241
Abstract
Cellulosic sugars production for the valorization of lignocellulosic biomass residues in an industrial site has economic benefits and is promising if integrated into a biorefinery. Enzymatic hydrolysis (EH) of pretreated Eucalyptus globulus bark, an industrial residue of low-economic value widely available in Portuguese pulp and paper mills, could be an excellent approach to attain resource circularity and pulp mill profitability. This work evaluated the potential for improving cellulosic sugars concentrations by operating with high solids loading and introducing the additives Triton X-100, PEG 4000 and Tween 80 using a commercial enzymatic consortium with a dosage of 25 FPU gcarbohydrates−1. Additives did not improve enzymatic hydrolysis performance, but the effect of increasing solids loading to 14% (w/v) in batch operation was accomplished. The fed-batch operation strategy was investigated and, when starting with 11% (w/v) solids loading, allowed the feeding of 3% (w/v) fresh feedstock sequentially at 2, 4 and 6 h, attaining 20% (w/v) total solids loading. After 24 h of operation, the concentration of cellulosic sugars reached 161 g L−1, corresponding to an EH conversion efficiency of 76%. Finally, the fermentability of the fed-batch hydrolysate using the Ethanol Red® strain was evaluated in a 5 L bioreactor scale. The present results demonstrate that Eucalyptus globulus bark, previously pretreated by kraft pulping, is a promising feedstock for cellulosic sugars production, allowing it to become the raw material for feeding a wide range of bioprocesses.
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Published
Mar 02, 2023
Vol/Issue
9(3)
Pages
241
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Funding
National Funds Award: 21874
COMPETE 2020 Award: 21874
project CICECO-Aveiro Institute of Materials Award: 21874
InPaCTus—Innovative Products and Technologies from Eucalyptus Award: 21874
Portugal 2020 through European Regional Development Fund (ERDF) Award: 21874
CIEPQPF—Strategic Research Centre Project Award: 21874
Cite This Article
Mariana S. T. Amândio, Jorge M. S. Rocha, Ana M. R. B. Xavier (2023). Enzymatic Hydrolysis Strategies for Cellulosic Sugars Production to Obtain Bioethanol from Eucalyptus globulus Bark. Fermentation, 9(3), 241. https://doi.org/10.3390/fermentation9030241
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