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Fermentation
Volume 8
Issue 10
10.3390/fermentation8100531
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Article

Production of Butyric Acid from Hydrolysate of Rice Husk Treated by Alkali and Enzymes in Immobilized Fermentation by Clostridium tyrobutyricum CtΔpta

by
Yueying Lin
1,
Wanjing Sun
1,
Geng Wang
1,
Haohan Chen
1,
Xun Pei
1,
Yuyue Jin
1,
Shang-Tian Yang
2 and
Minqi Wang
1,*
1
College of Animal Science, Zhejiang University, Hangzhou 310058, China
2
Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH 43210, USA
*
Author to whom correspondence should be addressed.
Fermentation 2022, 8(10), 531; https://doi.org/10.3390/fermentation8100531
Submission received: 20 September 2022 / Revised: 5 October 2022 / Accepted: 6 October 2022 / Published: 11 October 2022
(This article belongs to the Special Issue Application of Microbial Fermentation in Organic Matter Production)
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Abstract

Rice husk, as a cellulose-rich by-product in agriculture, has been considered as a low-cost substrate for the production of bioethanol and chemicals. In this study, rice husk was pretreated with an alkali, followed by cellulose and β-glucosidase hydrolysis optimized by an orthogonal experiment and response surface methodology (RSM), respectively. Under the optimal treatment conditions, a hydrolysate containing a high reducing sugar yield (77.85%) was obtained from the rice husk. Then, the hydrolysate was used as a carbon substrate for butyric acid production through Clostridium tyrobutyricum Δpta fermentation. Compared to free-cell fermentation, higher concentrations of butyric acid (50.01 g/L vs. 40.8 g/L and 49.03 g/L vs. 27.49 g/L) were observed in immobilized-cell fermentation for the carbon source of glucose and hydrolysate, respectively. A final butyric acid concentration of 16.91 g/L, a yield of 0.31 g/g, and an overall productivity of 0.35 g/L/h from rice husk hydrolysate were obtained in the repeated-fed-batch mode. Taken together, rice husk hydrolysate can be effectively utilized for the bioproduction of butyrate with immobilized-cell fermentation.
Keywords: rice husk; Clostridium tyrobutyricum; butyric acid; fibrous bed bioreactor rice husk; Clostridium tyrobutyricum; butyric acid; fibrous bed bioreactor

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MDPI and ACS Style

Lin, Y.; Sun, W.; Wang, G.; Chen, H.; Pei, X.; Jin, Y.; Yang, S.-T.; Wang, M. Production of Butyric Acid from Hydrolysate of Rice Husk Treated by Alkali and Enzymes in Immobilized Fermentation by Clostridium tyrobutyricum CtΔpta. Fermentation 2022, 8, 531. https://doi.org/10.3390/fermentation8100531

AMA Style

Lin Y, Sun W, Wang G, Chen H, Pei X, Jin Y, Yang S-T, Wang M. Production of Butyric Acid from Hydrolysate of Rice Husk Treated by Alkali and Enzymes in Immobilized Fermentation by Clostridium tyrobutyricum CtΔpta. Fermentation. 2022; 8(10):531. https://doi.org/10.3390/fermentation8100531

Chicago/Turabian Style

Lin, Yueying, Wanjing Sun, Geng Wang, Haohan Chen, Xun Pei, Yuyue Jin, Shang-Tian Yang, and Minqi Wang. 2022. "Production of Butyric Acid from Hydrolysate of Rice Husk Treated by Alkali and Enzymes in Immobilized Fermentation by Clostridium tyrobutyricum CtΔpta" Fermentation 8, no. 10: 531. https://doi.org/10.3390/fermentation8100531

APA Style

Lin, Y., Sun, W., Wang, G., Chen, H., Pei, X., Jin, Y., Yang, S.-T., & Wang, M. (2022). Production of Butyric Acid from Hydrolysate of Rice Husk Treated by Alkali and Enzymes in Immobilized Fermentation by Clostridium tyrobutyricum CtΔpta. Fermentation, 8(10), 531. https://doi.org/10.3390/fermentation8100531

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