Enhanced bioethanol production from sugarcane bagasse: combination of liquid hot water and deep eutectic solvent pretreatment for optimized enzymatic saccharification

doi:10.1007/s11705-024-2438-9

2024, Vol. 18

Issue (8) : 85 https://doi.org/10.1007/s11705-024-2438-9

Enhanced bioethanol production from sugarcane bagasse: combination of liquid hot water and deep eutectic solvent pretreatment for optimized enzymatic saccharification

Xiaoling Xian, Biying Li, Shiyong Feng, Jiale Huang, Xinyuan Fu, Ting Wu, Xiaoqing Lin(

)

School of Chemical Engineering and Light Industry, Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou 510006, China

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Abstract

In the present study, a sustainable pretreatment methodology combining liquid hot water and deep eutectic solvent is proposed for the efficient fractionation of hemicellulose, cellulose, and lignin from sugarcane bagasse, thereby facilitating the comprehensive utilization of both C5 and C6 sugars. The application of this combined pretreatment strategy to sugarcane bagasse led to notable enhancements in enzymatic saccharification and subsequent fermentation. Experiment results demonstrate that liquid hot water-deep eutectic solvent pretreatment yielded 85.05 ± 0.66 g·L^–1 of total fermentable sugar (glucose: 60.96 ± 0.21 g·L^–1, xylose: 24.09 ± 0.87 g·L^–1) through enzymatic saccharification of sugarcane bagasse. Furthermore, fermentation of the pretreated sugarcane bagasse hydrolysate yielded 34.33 ± 3.15 g·L^–1 of bioethanol. These findings confirm the effectiveness of liquid hot water-deep eutectic solvent pretreatment in separating lignocellulosic components, thus presenting a sustainable and promising pretreatment method for maximizing the valuable utilization of biomass resources.

Keywords sugar cane bagasse synergistic pretreatment enzymatic saccharification ethanol

Corresponding Author(s): Xiaoqing Lin

Just Accepted Date: 29 April 2024 Issue Date: 17 June 2024

Cite this article:

Xiaoling Xian,Biying Li,Shiyong Feng, et al. Enhanced bioethanol production from sugarcane bagasse: combination of liquid hot water and deep eutectic solvent pretreatment for optimized enzymatic saccharification[J]. Front. Chem. Sci. Eng., 2024, 18(8): 85.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-024-2438-9
https://academic.hep.com.cn/fcse/EN/Y2024/V18/I8/85

Fig.1 Results of enzymatic saccharification of LHW liquid after LHW pretreatment at different times and temperatures. (a) 130 °C; (b) 150 °C; (c) 170 °C; (d) 190 °C.

Tab.1 Fermentation results of LHW liquid

Tab.2 Contents of component, retention rate and removal rate of LHW residue.

Tab.3 Contents of component, retention rate and removal rate of 150 °C-2 h LHW-pretreated-SCB pretreated by DES for 90 min at different temperatures

Fig.2 Results of enzymatic saccharification of 150 °C-2 h LHW-pretreated SCB after DES pretreatment at different temperatures (Enzymatic condition: SLR of 1:10; the cellulase loadings of 27 FPU·(g SCB)^–1, the xylanase loading of 1170 FXU·(g SCB)^–1). (a) Concentration of fermentable sugar; (b) enzymatic conversion.

Tab.4 Contents of component, retention rate and removal rate of 150 °C-2 h LHW-pretreated-SCB pretreated by DES at 120 °C for different time.

Fig.3 Results of enzymatic saccharification of 150 °C-2 h LHW-pretreated SCB after DES pretreatment at 120 °C for different time (Enzymatic condition: SLR of 1:10; the cellulase loadings of 27 FPU·(g SCB)^–1, the xylanase loading of 1170 FXU·(g SCB)^–1). (a) Concentration of fermentable sugar; (b) enzymatic conversion.

Fig.4 Results of enzymatic saccharification of untreated SCB, LHW-pretreated SCB, DES-pretreated SCB and LHW-DES pretreated SCB (Enzymatic condition: SLR of 1:10; the cellulase loadings of 27 FPU·(g SCB)^–1, the xylanase loading of 1170 FXU·(g SCB)^–1).

Fig.5 Effects of cellulase loadings on enzymatic hydrolysis of LHW-DES pretreated SCB. (a) The change of glucose concentration with time; (b) conversion of glucose, xylose, and total fermentable sugar on enzymatic hydrolysis for 120 h.

Fig.6 (a) Results of enzymatic saccharification of SCB before and after combined pretreatment at cellulase loadings of 27 FPU·g^–1; (b) fermentation curves of SCB; (c) fermentation curves of LHW-DES pretreated SCB (no pH adjustment); (d) fermentation curves of LHW-DES pretreated SCB (initial pH = 6).

Fig.7 Mass balances of SCB for different pretreatments at the optimal conditions.

Fig.8 FTIR spectra of untreated SCB, LHW pretreated SCB and LHW-DES pretreated SCB (LHW pretreatment was performed at 150 °C for 2 h (at the SLR of 1:6). DES pretreatment was performed with TEBAC:LA (1:7 mol ratio), at 120 °C for 90 min).

Fig.9 XRD spectra of untreated SCB, LHW pretreated SCB and LHW-DES pretreated SCB (LHW pretreatment was performed at 150 °C for 2 h (at the SLR of 1:6). DES pretreatment was performed with TEBAC:LA (1:7 mol ratio), at 120 °C for 90 min).

Fig.10 SEM images of different SCBs. (a) Untreated SCB; (b) LHW pretreated SCB; (c) LHW-DES pretreated SCB.

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