Abstract
Purpose
Wheat bran is an agricultural waste which can be used as a cost effective animal feed but existence of beta-glucan in it would cause some digestion problems. Beta 1,3–1,4 glucanase is a enzymes that catalyze the hydrolysis of beta-glucan to sub-units. In this study optimization of production of beta-glucanase by Aspergillus niger CCUG33991 strain with wheat bran as a cheap substrate by SSF and valorization of wheat bran were evaluated.
Methods
A two-step experimental design procedure was employed for screening and optimization of influencing factors on beta-glucanase production. Effects of six nutritional and environmental factors were investigated by PBD. To reach higher amounts of beta-glucanase, RSM was employed to optimize beta-glucanase production as a function of three of the most effective factors. Also structural analysis of fermented and unfermented wheat bran was done.
Results
The experimental value of enzyme activity was 121.6 Units per gram of dry substrate (U/gds) under the optimal conditions (temperature 33 °C, humidity 70% and incubation time 51 h). SEM and FTIR showed intensive fungal growth on wheat bran, and partial removal of lignin, phytic acid and hemicelluloses such as beta-glucan.
Conclusion
The study demonstrated the feasibility of wheat bran utilization in SSF using Aspergillus niger CCUG33991 toward the production of beta-glucanase and valorization of wheat bran as an animal feed.
Graphic Abstract
Abbreviations
- SSF:
-
Solid-state fermentation
- SmF:
-
Submerged fermentation
- PBD:
-
Plackett Burman design
- RSM:
-
Response surface methodology
- OFAT:
-
One factor at time
- SEM:
-
Scanning electron microscope
- FTIR:
-
Fourier transform infrared
- ANOVA:
-
Analysis of variance
- DNS:
-
Dinitrosalicylic acid
- CMCase:
-
Carboxymethyl cellulase
- FPase:
-
Filter paperase
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Acknowledgements
The authors are thankful to the Shahid Bahonar University of Kerman and Esfahan Agriculture and Natural Resources Research Center for their partial support of this work.
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Heidary Vinche, M., Khanahmadi, M., Ataei, S.A. et al. Optimization of Process Variables for Production of Beta-Glucanase by Aspergillus niger CCUG33991 in Solid-State Fermentation Using Wheat Bran. Waste Biomass Valor 12, 3233–3243 (2021). https://doi.org/10.1007/s12649-020-01177-0
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DOI: https://doi.org/10.1007/s12649-020-01177-0