Effect of integrated treatment on improving the enzymatic digestibility of poplar and the structural features of isolated hemicelluloses.
Identifieur interne : 000001 ( Main/Exploration ); précédent : 000000; suivant : 000002Effect of integrated treatment on improving the enzymatic digestibility of poplar and the structural features of isolated hemicelluloses.
Auteurs : Shao-Chao Sun [République populaire de Chine] ; Dan Sun [République populaire de Chine] ; Han-Min Wang [République populaire de Chine] ; Han-Yin Li [République populaire de Chine] ; Xue-Fei Cao [République populaire de Chine] ; Shao-Ni Sun [République populaire de Chine] ; Tong-Qi Yuan [République populaire de Chine]Source :
- Carbohydrate polymers [ 1879-1344 ] ; 2021.
Abstract
Herein, a two-step hydrothermal pretreatment combined with alkali extraction method was applied to deconstruct the poplar cell walls for enzymatic hydrolysis. Results revealed that 88.1 % of hemicelluloses and 77.6 % of lignin were removed during the integrated treatment performed at 180 °C and a maximum enzymatic hydrolysis efficiency of 96.1 % was achieved. Confocal Raman microscopy suggested that the removal of hemicelluloses from cell walls was inhomogeneous, and most hemicelluloses were released from the secondary wall. In addition, 35.2-56.8 % of hemicelluloses were isolated from the integrated treatment. Detailed structural analysis revealed that the water-soluble hemicelluloses possessed more branched structure than the alkali-soluble hemicelluloses and the hemicelluloses isolated from the poplar were mainly composed of a linear backbone of (1→4)-β-d-Xylp with 4-O-Me-α-d-GlcpA attached as side chains. This work provides an efficient pathway to transform poplar into fermentable sugars and hemicelluloses with considerable yield.
DOI: 10.1016/j.carbpol.2020.117164
PubMed: 33183615
Affiliations:
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<front><div type="abstract" xml:lang="en">Herein, a two-step hydrothermal pretreatment combined with alkali extraction method was applied to deconstruct the poplar cell walls for enzymatic hydrolysis. Results revealed that 88.1 % of hemicelluloses and 77.6 % of lignin were removed during the integrated treatment performed at 180 °C and a maximum enzymatic hydrolysis efficiency of 96.1 % was achieved. Confocal Raman microscopy suggested that the removal of hemicelluloses from cell walls was inhomogeneous, and most hemicelluloses were released from the secondary wall. In addition, 35.2-56.8 % of hemicelluloses were isolated from the integrated treatment. Detailed structural analysis revealed that the water-soluble hemicelluloses possessed more branched structure than the alkali-soluble hemicelluloses and the hemicelluloses isolated from the poplar were mainly composed of a linear backbone of (1→4)-β-d-Xylp with 4-O-Me-α-d-GlcpA attached as side chains. This work provides an efficient pathway to transform poplar into fermentable sugars and hemicelluloses with considerable yield.</div>
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