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Xylitol-Sweetener Production from Barley Straw: Optimization of Acid Hydrolysis Condition with the Energy Consumption Simulation

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Abstract

Purpose

Barley straw from brewing process is an attractive and renewable raw material for the production of biofuel and useful chemicals, such as xylitol. It is necessary to determine the best conditions of biomass hydrolysis and fermentation for boosting the incorporation of this biomass in a biorefinery.

Methods

We optimized the conditions for acid hydrolysis of barley straw to obtain a hemicellulosic hydrolysate rich in xylose with low energy consumption. Moreover, the energy consumption was simulated per quantity of xylose extracted. In order to obtain a hydrolysate with the highest xylose extraction efficiency (99%), low inhibitors concentration and energy consumption (8.41 KW/Kg Xylose), we used 1.0% H2SO4 (w/v) at 120 °C, with 1:10 dry-weight/acid solution for 40 min. We also optimized the medium composition to improve xylitol production by Candida guilliermondii.

Results

The hemicellulosic hydrolysate was used as a fermentation medium and the best condition showing the highest xylitol volumetric productivity (0.69 g L−1 h−1) by C. guilliermondii was found to be 60 g L−1 initial xylose supplemented with 1.5 g L−1 (NH4)2SO4, 0.75 CaCl2 and 8.75 g L−1 rice bran extract.

Conclusions

It can be concluded that barley straw can be used in biorefinery, wherein the hemicellulose fraction would be utilized to produce xylitol and the cellulosic fraction (more accessible to enzymatic hydrolysis after pre-treatment) would be used for the production of cellulosic ethanol.

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Acknowledgements

The authors are grateful to FAPESP (Process No. 03/04800-0), CAPES and CNPq for the financial support.

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Authors and Affiliations

  1. Department of Chemical Engineering, Engineering School of Lorena, University of São Paulo, Estrada Municipal do Campinho s/n, Lorena, SP, CEP 12602-810, Brazil

    Elisângela de Jesus Cândido Moraes

  2. Department of Biochemistry and Chemical Technology, Institute of Chemistry, São Paulo State University-UNESP, Av. Prof. Francisco Degni, 55 -Jardim Quitandinha, Araraquara, SP, CEP 14800-900, Brazil

    Débora Danielle Virgínio Silva, Kelly Johana Dussán & Luana Zanchetta Tesche

  3. Department of Biotechnology, Engineering School of Lorena, University of São Paulo, Estrada Municipal do Campinho s/n, Lorena, SP, CEP 12602-810, Brazil

    Joao Batista de Almeida Silva & Maria das Graças de Almeida Felipe

  4. Nanobiotechnology Laboratory, Department of Biotechnology, Sant Gadge Baba Amravati University, Amravati, Maharashtra, 444 602, India

    Mahendra Rai

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  1. Elisângela de Jesus Cândido Moraes
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Moraes, E.d.C., Silva, D.D.V., Dussán, K.J. et al. Xylitol-Sweetener Production from Barley Straw: Optimization of Acid Hydrolysis Condition with the Energy Consumption Simulation. Waste Biomass Valor 11, 1837–1849 (2020). https://doi.org/10.1007/s12649-018-0501-9

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