γ-Valerolactone/CuCl₂ biphasic system for high total monosaccharides recovery from pretreatment and enzymatic hydrolysis processes of eucalyptus

Abstract

The efficient fractionation and recovery of monosaccharides (xylose and glucose) from lignocellulosic biomass facilitates subsequent sugar-based derivative production. This study introduces a one-pot γ-valerolactone/CuCl₂ biphasic pretreatment system (100-mmol·L^–1 CuCl₂, 180 °C, 60 min) capable of achieving removal rates of 92.25% and 90.64% for xylan and lignin, respectively, while retaining 83.88% of cellulose. Compared to other metal chlorides (NaCl, LiCl, FeCl₃, and AlCl₃), the γ-valerolactone/CuCl₂ system recovered 121.2 mg·(g eucalyptus)^–1 of xylose and 55.96 mg·(g eucalyptus)^–1 of glucose during the pretreatment stage and 339.2 mg·(g eucalyptus)^–1 of glucose during the enzymatic hydrolysis stage (90.78% of glucose yield), achieving a total monosaccharide recovery of 86.31%. In addition, the recovery of γ-valerolactone was 79.33%, exhibiting minimal changes relative to the pretreatment performance. The method proposed in this study allows a high total monosaccharides recovery and a circular economy-oriented pretreatment approach, offering a viable pathway for biorefinery.

Graphical abstract

Keywords

lignocellulose / biorefinery / total monosaccharides recovery / γ-valerolactone

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Competing interests

The authors declare that they have no competing interests.

Acknowledgements

This research was financially supported by the Opening Project of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control (Grant No. 2021KF41) and the Young Innovative Talents Scientific Research Project of Guangxi (Grant No. AD23026256) and the Guangxi Natural Science Foundation of China (Grant No. 2023GXNSFGA026001).

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11705-024-2490-5 and is accessible for authorized users.

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