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    Revealing the mechanism of lignin re-polymerization inhibitor in acidic pretreatment and its impact on enzymatic hydrolysis

    Year: 2022

    Journal: Ind. Crop. Prod., Volume 179, MAY

    Authors: He, Juan; Huang, Caoxing; Lai, Chenhuan; Wang, Zhongkai; Yuan, Liang; Ragauskas, Arthur; Yan, Youxian; Yong, Qiang

    Organizations: National Natural Science Foundation of China [31800501]; Shenzhen Government's Plan of Science and Technology [JCYJ20170818144659020]; National First-Class Disciplines (PNFD); Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD); Doctorate Fellowship Foundation of Nanjing Forestry University; UTK Governor Chair position

    Keywords: Dilute acid pretreatment; Additives; Enzymatic hydrolysis; Lignin reconstruction

    Phenolic additives, including 2-naphthol, 2-naphthol-7-sulfonate, and resorcinol were evaluated for their impact on the lignin re-polymerization and subsequent hydrolysis of bamboo residues. Low surface lignin concentration (65.68%) of the substrate and high Tg value (185 ?) of lignin was observed for 2-naphthol-7-sulfonate assisted pretreatment, leading to the most significant increase (14%) in enzymatic hydrolysis efficiency of pretreated bamboo residues. Meanwhile, physicochemical properties of lignin revealed that the introduced sulfonic acid groups increased the surface charge, decreased the molecular weight, promoted the cleavage of beta-O-4 linkages, and prevented the re-condensation of lignin. Even though resorcinol-assisted pretreatment, by contrast, was found to be an inhibitor for enzymatic hydrolysis. NMR analysis of modified lignin showed that resorcinol led to a higher amount of non-condensed phenolic OH groups and promoted the cleavage of beta-O-4 linkages, acting as an inhibitor in lignin re-polymerization during the dilute acidic pretreatment. In short, the above findings present a detailed view of suppressing lignin re-polymerization for boosting the utilization of bioresources with acidic pretreatment.
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