Smart removal of monosaccharide contaminants in xylo-oligosaccharide slurry using sandwich-integration bioprocess of whole-cell catalysis combined with electrodialysis separation

Xinlu Liu, Rou Cao, Ali Nawaz, Ikram ul Haq, Xin Zhou and Yong Xu

Renewable Energy, 2021, vol. 168, issue C, 1149-1156

Abstract: Acetic acid hydrolysis is a green and novel approach that can effectively convert lignocellulosic biomass into high-valued xylo-oligosaccharide (XOS). However, the residual acidolysis slurry still contains acetic acid and various monosaccharides. In this study, a sandwich-integration bioprocess (SIBP) method was developed to efficiently remove the residual monosaccharide contaminants by the combination of whole-cell catalysis and electrodialysis separation. Firstly, the acetic acid in acidolysis slurry was separated by electrodialysis to eliminate the strong toxic inhibition on whole-cell catalysis. Secondly, the monosaccharides were oxidized to the corresponding ionogenic acids by whole-cell catalysis. Finally, these ionogenic aldonic acids were removed readily by the second electrodialysis step. Herein, whole-cell catalysis step was combined with two electrodialysis separation steps into SIBP, in which 131.4 g XOS and 79 g aldonic acids were obtained from 1 kg corncob and more than 93.1% acetic acid was recycled.

Keywords: Sandwich-integration bioprocess; Xylo-oligosaccharide; Gluconobacter oxydans; Whole-cell catalysis; Electrodialysis (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:168:y:2021:i:c:p:1149-1156

DOI: 10.1016/j.renene.2021.01.007

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