Comparison of the substrate enzymatic digestibility and lignin structure of wheat straw stems and leaves pretreated by green liquor

Bioresource Technology
Bo JiangYongcan Jin

Abstract

In this work, the substrate enzymatic digestibility (SED) and the lignin structure of green liquor (GL) pretreated wheat straw stems and leaves were investigated. Compared with wheat straw stems, leaves showed higher delignification selectivity in GL pretreatment and higher SED in enzymatic hydrolysis. Wet chemical analysis indicated that, characterized with lower content of syringyl units and less β-O-4 linkages, leaf lignin is structurally different from stem lignin. After GL pretreatment, the drops of both nitrobenzene oxidation and ozonation products yield of leaves were obviously higher than those of stems, which means that more β-O-4 linkages of leaf lignin were broken than that of stem lignin. The SED of total sugar in GL-pretreated leaves was about 50% higher than that in GL-pretreated stems. The less content and lower S/G ratio of lignin are suggested to be the important factors for the better SED of GL-pretreated leaves.

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Citations

Mar 8, 2016·Bioresource Technology·Raveendran SindhuAshok Pandey
Dec 6, 2016·Frontiers in Chemistry·Mi LiArthur J Ragauskas
Jan 11, 2020·Frontiers in Chemistry·Aya Zoghlami, Gabriel Paës
Feb 9, 2021·Frontiers in Bioengineering and Biotechnology·Chen ChenAi-Min Wu

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