Glycolic acid-based deep eutectic solvents boosting co-production of xylo-oligomers and fermentable sugars from corncob and the related kinetic mechanism

Biotechnology for Biofuels and Bioproducts

Research

Wen-Yong Lou¹  Lin-Hao Lai¹  Hai-Qing Deng²  Jun-Tao Fan²  Ping-Zhang Fu²  Li-Hao Liu²  Han-Lin Lei²  Xiao-Hui Lin²  Jia-Jun Guan²  Xue-Dan Hou³ 

[1] Lab of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, 510640, Guangzhou, Guangdong, China;School of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, 510006, Guangzhou, China;School of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, 510006, Guangzhou, China;Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, 510006, Guangzhou, China;

关键词: Corncob;    Deep eutectic solvents;    Xylo-oligomers;    Metal ions;    Kinetic mechanism;   

DOI  :  10.1186/s13068-023-02369-1

 received in 2023-06-19, accepted in 2023-07-19,  发布年份 2023

来源: Springer

【 摘 要 】

BackgroundXylo-oligomers are a kind of high value-added products in biomass fractionation. Although there are several chemical methods to obtain xylo-oligomers from biomass, the reports about the deep eutectic solvents (DESs)-mediated co-production of xylo-oligomers and fermentable sugars and the related kinetic mechanism are limited.ResultsIn this work, glycolic acid-based DESs were used to obtain xylo-oligomers from corncob. The highest xylo-oligomers yield of 65.9% was achieved at 120 °C for 20 min, of which the functional xylo-oligosaccharides (XOSs, DP 2–5) accounted for up to 31.8%. Meanwhile, the enzymatic digestion of cellulose and xylan in residues reached 81.0% and 95.5%, respectively. Moreover, the addition of metal inorganic salts significantly accelerated the hydrolysis of xylan and even the degradation of xylo-oligomers in DES, thus resulting in higher selectivity of xylan removal. AlCl3 showed the strongest synergistic effect with DES on accelerating the processes, while FeCl2 is best one for xylo-oligomers accumulation, affording the highest xylo-oligomers yield of 66.1% for only 10 min. Furthermore, the kinetic study indicates that the ‘potential hydrolysis degree’ model could well describe the xylan hydrolysis processes and glycolic acid/lactic acid (3:1) is a promising solvent for xylo-oligomers production, in particular, it worked well with FeCl2 for the excellent accumulation of xylo-oligomers.ConclusionsGlycolic acid-based deep eutectic solvents can be successfully applied in corncob fractionation with excellent xylo-oligomers and fermentable sugars yields on mild conditions, and the large amount of xylo-oligosaccharides accumulation could be achieved by specific process controlling. The strategies established here can be useful for developing high-valued products from biomass.

【 授权许可】

CC BY   
© BioMed Central Ltd., part of Springer Nature 2023

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