4.8 Article

Lignin fractionation to realize the comprehensive elucidation of structure-inhibition relationship of lignins in enzymatic hydrolysis

Journal

BIORESOURCE TECHNOLOGY
Volume 355, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127255

Keywords

Lignin fractionation; Pretreatment severity; Lignin structure; Enzymatic hydrolysis; Lignin inhibition

Funding

  1. National Natural Science Foundation of China [31971606]
  2. Natural Science Foundation of Jiangsu Province, China [BK20190091]

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This study investigates the relationship between lignin structures and their inhibitory effects in enzymatic saccharification. The results indicate that the content of condensed aromatic units and phenolic hydroxyl are crucial factors determining the lignin inhibition. The findings provide important insights for the development of lignocellulose biorefinery processes.
A better understanding of the relationship between lignin structures and their inhibitory effects in enzymatic saccharification would facilitate the development of lignocellulose biorefinery process. However, the heterogeneity of lignins challenges the elucidation of lignin structure-inhibition correlation. In this study, two types of lignin fractions including ethanol soluble lignins and ethanol insoluble lignins were respectively isolated from the poplars pretreated with various severities. The impacts of pretreatment severities on the structural changes of lignin fractions were studied from the perspective of inter-units linkages, condensed aromatic substructure, and hydroxyl groups. Furthermore, it was observed that lignin addition strongly inhibited the enzymatic saccharification of pure cellulose by 13.3 ~ 56.3%. Lignin inhibition extents were increased with the elevated pretreatment severity. The relationships between the lignin structural features and lignin inhibition were analyzed, which revealed that the contents of condensed aromatic units and phenolic hydroxyl were crucial factors determining the lignin inhibition.

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