Abstract
In this study, we investigated cellulase production by Penicillium oxalicum EU2106 under solid-state fermentation (SSF) and its hydrolysis efficiency toward NaOH–H2O2-pretreated cassava residue (NHCR) produced after bioethanol fermentation. Optimization of SSF cultivation conditions for P. oxalicum EU2106 using a Box-behnken design-based response-surface methodology resulted in maximal cellulase activity of 34.0 ± 2.8 filter-paper units/g dry substrate, exhibiting a ~ twofold increase relative to activities obtained under non-optimized conditions. Furthermore, SSF-derived cellulase converted 94.3 ± 1.5% of NHCR cellulose into glucose within 96 h. Interestingly, P. oxalicum EU2106 produced higher β-glucosidase activity under SSF conditions than that under submerged-state fermentation conditions, resulting in the elimination of cellobiose inhibition during the early stages of NHCR cellulose hydrolysis. Overall, this work provided an alternative for a potential cellulase source and a preferred option for cassava residue biotechnological application.
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Abbreviations
- BBD:
-
Box-behnken design
- BGL:
-
β-glucosidase
- CB:
-
Corncob
- CGMCC:
-
The China general microbiological culture collection center
- CBH:
-
Cellobiohydrolase
- CMCase:
-
Carboxymethylcellulose cellulase
- CR:
-
Cassava residue
- EG:
-
Endo-1,4-β-d-glucanase
- FPase:
-
Filter-paper cellulase
- FPU:
-
Filter-paper units
- Gds:
-
Gram of dry substrate
- HPLC:
-
High-performance liquid chromatography
- NHCR:
-
NaOH–H2O2 pretreated cassava residue
- pNPCase:
-
p-nitrophenyl-β-cellobioside cellulase
- pNPGase:
-
p-nitrophenyl-β-glucopyranoside cellulase
- RH:
-
Rice husk
- RS:
-
Rice straw
- RSM:
-
Response-surface methodology
- SSF:
-
Solid-state fermentation
- SmF:
-
Submerged-state fermentation
- SB:
-
Sugarcane bagasse
- WB:
-
Wheat bran
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Acknowledgements
This work was financially supported by grants from the Guangxi BaGui Scholars Program Foundation (Grant Number 2011A001), the ‘One Hundred Person’ Project of Guangxi, the National Natural Science Foundation of China (Grant Number 31260017 and 31660305), and Excellent Teaching Program of Guangxi High Education– Program of Advantageous and Characteristic Specialty (Excellent Undergraduate Major).
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Lin-Hui Su and Shuai Zhao have contributed equally to this work.
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Su, LH., Zhao, S., Jiang, SX. et al. Cellulase with high β-glucosidase activity by Penicillium oxalicum under solid state fermentation and its use in hydrolysis of cassava residue. World J Microbiol Biotechnol 33, 37 (2017). https://doi.org/10.1007/s11274-016-2200-7
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DOI: https://doi.org/10.1007/s11274-016-2200-7