Recent advances in understanding the effects of lignin structural characteristics on enzymatic hydrolysis

被引:113
|
作者
Yuan, Yufeng [1 ]
Jiang, Bo [1 ]
Chen, Hui [1 ]
Wu, Wenjuan [1 ]
Wu, Shufang [1 ]
Jin, Yongcan [1 ,3 ]
Xiao, Huining [2 ]
机构
[1] Nanjing Forestry Univ, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat F, Nanjing 210037, Peoples R China
[2] Univ New Brunswick, Dept Chem Engn, Fredericton, NB E3B11 5A3, Canada
[3] Nanjing Forestry Univ, Lab Wood Chem, 159 Longpan Rd, Nanjing 210037, Peoples R China
基金
中国国家自然科学基金;
关键词
Lignocellulose; Enzymatic hydrolysis; Lignin; Cellulase; Interaction; IONIC LIQUID PRETREATMENT; EMPTY FRUIT BUNCH; WHEAT-STRAW; DILUTE-ACID; ORGANOSOLV PRETREATMENT; SUGARCANE BAGASSE; GREEN LIQUOR; THIN-FILMS; AUTOHYDROLYSIS PRETREATMENT; HYDROTHERMAL PRETREATMENT;
D O I
10.1186/s13068-021-02054-1
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Enzymatic hydrolysis of lignocellulose for bioethanol production shows a great potential to remit the rapid consumption of fossil fuels, given the fact that lignocellulose feedstocks are abundant, cost-efficient, and renewable. Lignin results in low enzymatic saccharification by forming the steric hindrance, non-productive adsorption of cellulase onto lignin, and deactivating the cellulase. In general, the non-productive binding of cellulase on lignin is widely known as the major cause for inhibiting the enzymatic hydrolysis. Pretreatment is an effective way to remove lignin and improve the enzymatic digestibility of lignocellulose. Along with removing lignin, the pretreatment can modify the lignin structure, which significantly affects the non-productive adsorption of cellulase onto lignin. To relieve the inhibitory effect of lignin on enzymatic hydrolysis, enormous efforts have been made to elucidate the correlation of lignin structure with lignin-enzyme interactions but with different views. In addition, contrary to the traditional belief that lignin inhibits enzymatic hydrolysis, in recent years, the addition of water-soluble lignin such as lignosulfonate or low molecular-weight lignin exerts a positive effect on enzymatic hydrolysis, which gives a new insight into the lignin-enzyme interactions. For throwing light on their structure-interaction relationship during enzymatic hydrolysis, the effect of residual lignin in substrate and introduced lignin in hydrolysate on enzymatic hydrolysis are critically reviewed, aiming at realizing the targeted regulation of lignin structure for improving the saccharification of lignocellulose. The review is also focused on exploring the lignin-enzyme interactions to mitigate the negative impact of lignin and reducing the cost of enzymatic hydrolysis of lignocellulose.
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页数:20
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