Abstract
Bioethanol is obtained by hydrolysis of sugarcane bagasse by cellulases. Commercial cellulases are expensive and have a low concentration of β-glucosidase (EC 3.2.1.21), which decrease hydrolysis efficiency. The present work aims to produce supernatant rich in β-glucosidase (BGL) using the yeast Rhodotorula oryzicola and apply it in the hydrolysis of delignified sugarcane bagasse. Yeast fermented in a modified YPD (Yeast Peptone Dextrose) medium with 0.5% (w/v) cellobiose and 1.0% (w/v) glucose produced BGL with a specific activity of 1.44 ± 0.013 U/mg. Partial purification of BGL by acetone showed a specific activity of 3.48 U/mg. The optimum pH and temperature were 6.02 and 65 °C, respectively. BGL partially purified (BGLppR.oryzicola) by acetone showed tolerance to glucose, with a relative activity of 82.89 ± 0.11%. The activity increased with the addition of iron sulfate and zinc sulfate and decreased with manganese sulfate. BGL partially purified was thermal stable, with a relative activity of 85.59% after 60 min at 90 °C. BGL partially purified applied in the hydrolysis of sugarcane bagasse delignified with 3% (w/w) NaOH + 6% (w/w) Na2SO3 showed a conversion rate of 72.46 ± 1.60%. The results showed that BGL partially purified is a glucose tolerant cellulase of low-cost, promising the application of bioethanol production.
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Availability of data and material
The datasets analyzed during the current study are available from the corresponding author on request.
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Abbreviations
- BGL:
-
β-Glucosidase
- BGLR.oryzicola:
-
β-Glucosidase from Rhodotorula oryzicola supernatant
- BGLppR.oryzicola:
-
β-Glucosidase from Rhodotorula oryzicola partially purified with acetone
- DNS:
-
3,5-Dinitrosalicylic acid
- rpm:
-
Rotations per minute
- ρNPβG:
-
4-Nitrophenyl-β-D-glucopyranoside
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Acknowledgements
FINEP (Financier of Studies and Projects), CAPES (Coordination of Improvement of Higher Level Personnel), CNPq (National Research Council), FAPESB (Foundation for Research Support of the State of Bahia), and Biotechnology Graduate Program of the State University of Feira de Santana (UEFS/FIOCRUZ).
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This work was supported by FINEP, CAPES, CNPq, and FAPESB.
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GR designed and carried out the experiments, analyzed the data and wrote the manuscript; SA received funding, helped design the experiments, analyze the data and reviewed the manuscript.
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de Araujo Ribeiro, G.C., Assis, S.A. Production of β-glucosidase by Rhodotorula oryzicola and use of enzyme for hydrolysis of sugarcane bagasse delignified. J Food Sci Technol 60, 2761–2771 (2023). https://doi.org/10.1007/s13197-023-05783-3
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DOI: https://doi.org/10.1007/s13197-023-05783-3