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Article

Optimized Bioconversion of Xylose Derived from Pre-Treated Crop Residues into Xylitol by Using Candida boidinii

1
Biorefinery Research Group, Department of Applied Biotechnology and Food Science, Budapest University of Technology and Economics, 1111 Budapest, Hungary
2
Metabolic Engineering Research Unit, School of Biotechnology, Institute of Agricultural Technology, Suranaree University of Technology, 111 University Avenue, Suranaree Sub-District, Muang District, Nakhon Ratchasima 30000, Thailand
*
Author to whom correspondence should be addressed.
Agronomy 2021, 11(1), 79; https://doi.org/10.3390/agronomy11010079
Received: 27 November 2020 / Revised: 28 December 2020 / Accepted: 29 December 2020 / Published: 1 January 2021
(This article belongs to the Special Issue Pretreatment and Bioconversion of Crop Residues)
Crop residues can serve as low-cost feedstocks for microbial production of xylitol, which offers many advantages over the commonly used chemical process. However, enhancing the efficiency of xylitol fermentation is still a barrier to industrial implementation. In this study, the effects of oxygen transfer rate (OTR) (1.1, 2.1, 3.1 mmol O2/(L × h)) and initial xylose concentration (30, 55, 80 g/L) on xylitol production of Candida boidinii NCAIM Y.01308 on xylose medium were investigated and optimised by response surface methodology, and xylitol fermentations were performed on xylose-rich hydrolysates of wheat bran and rice straw. High values of maximum xylitol yields (58–63%) were achieved at low initial xylose concentration (20–30 g/L) and OTR values (1.1–1.5 mmol O2/(L × h)). The highest value for maximum xylitol productivity (0.96 g/(L × h)) was predicted at 71 g/L initial xylose and 2.7 mmol O2/(L × h) OTR. Maximum xylitol yield and productivity obtained on wheat bran hydrolysate were 60% and 0.58 g/(L × h), respectively. On detoxified and supplemented hydrolysate of rice straw, maximum xylitol yield and productivity of 30% and 0.19 g/(L × h) were achieved. This study revealed the terms affecting the xylitol production by C. boidinii and provided validated models to predict the achievable xylitol yields and productivities under different conditions. Efficient pre-treatments for xylose-rich hydrolysates from rice straw and wheat bran were selected. Fermentation using wheat bran hydrolysate and C. boidinii under optimized condition is proved as a promising method for biotechnological xylitol production. View Full-Text
Keywords: wheat bran; rice straw; acidic hydrolysis; fermentation; aeration; detoxification wheat bran; rice straw; acidic hydrolysis; fermentation; aeration; detoxification
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MDPI and ACS Style

Bedő, S.; Fehér, A.; Khunnonkwao, P.; Jantama, K.; Fehér, C. Optimized Bioconversion of Xylose Derived from Pre-Treated Crop Residues into Xylitol by Using Candida boidinii. Agronomy 2021, 11, 79. https://doi.org/10.3390/agronomy11010079

AMA Style

Bedő S, Fehér A, Khunnonkwao P, Jantama K, Fehér C. Optimized Bioconversion of Xylose Derived from Pre-Treated Crop Residues into Xylitol by Using Candida boidinii. Agronomy. 2021; 11(1):79. https://doi.org/10.3390/agronomy11010079

Chicago/Turabian Style

Bedő, Soma, Anikó Fehér, Panwana Khunnonkwao, Kaemwich Jantama, and Csaba Fehér. 2021. "Optimized Bioconversion of Xylose Derived from Pre-Treated Crop Residues into Xylitol by Using Candida boidinii" Agronomy 11, no. 1: 79. https://doi.org/10.3390/agronomy11010079

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