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Maize bran as a potential substrate for production of β-glucosidase

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Abstract

Costs and conversion efficiency associated with cellulase preparations have been identified as factors impeding the development of cellulose hydrolysis–based technologies. Supplementing enzymes to fungal cocktails has been practiced; however, the costs associated offset the benefits of an increase in hydrolysis. This work explores the benefits of using maize bran as a substrate in a sequential fermentation mode to produce β-glucosidase (BGL), intended for augmenting commercial fungal cellulases. Aspergillus tubingensis was grown for BGL production on maize bran in sequential solid-state and submerged fermentation (SsF-SmF). In these experiments, a solid substrate was soaked with a nutrient medium and later with media containing 1% solid substrate. The sequential process was observed to yield a two-fold improvement in BGL production in comparison to traditional methods. The predominance of dispersed mycelia in the sequential process was noted and concluded to be the influencer for improved enzyme secretion. Different substrates were evaluated among which delignified maize bran was found to be the most suitable. The batch fermentation yielded BGL productivity of 400 ± 8.64 CBU/l/day, while the repeated fed-batch mode improved the BGL productivity to 647 ± 13.33 CBU/l/day and 987 ± 12.5 CBU/l/day for 50 and 25% medium replacement, respectively. Supplementing commercial cellulases with the produced BGL was observed to increase cellulose hydrolysis by 20%. This work, therefore, helps explore the potential of maize bran as a substrate for sequential SsF-SmF for BGL production in a cost-effective manner.

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Abbreviations

SsF:

Solid-state fermentation

SmF:

Submerged fermentation

BGL:

β-Glucosidase

SLPM:

Standard liters per minute

kDa:

Kilodalton

MB:

Maize bran

CBU:

Cellobiose unit

FPU:

Filter paper unit

CBU/l/day:

Cellobiose units per liter per day

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Acknowledgements

The work was supported in part by TEQIP-III, DBT-ICT Centre for Energy Biosciences, and Gencrest LLP Pvt. Ltd. The DBT-ICT Centre for Energy Biosciences is duly acknowledged for providing the infrastructure and facilities for the research work. The authors are grateful to both Privi Organics Pvt. Limited, Navi Mumbai, India, and Indian Glycols Limited, Uttarakhand, India, for providing biomass samples and to Gencrest LLP Pvt. Ltd. for the enzyme samples used in the study.

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SS and AAO conceptualized the study, and AAO facilitated funds for conducting the work. TM and SS designed the experiments, and TM conducted the experiments. Data analysis was conducted by TM, SS, and AAO. TM wrote the manuscript. TM, SS, and AAO critically reviewed and edited the manuscript. All authors read and approved the final manuscript.

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Correspondence to Annamma A. Odaneth.

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Mule, T.A., Sawant, S.S. & Odaneth, A.A. Maize bran as a potential substrate for production of β-glucosidase. Biomass Conv. Bioref. 14, 4029–4039 (2024). https://doi.org/10.1007/s13399-022-02747-z

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