Effect of steam explosion pretreatment on chosen saccharides yield and cellulose structure from fast-growing poplar (Populus deltoides × maximowiczii) wood

IF 3.1 2区农林科学 Q1 FORESTRY

Wood Science and Technology Pub Date : 2024-02-12 DOI:10.1007/s00226-024-01532-7

Donata Krutul, Jan Szadkowski, Eva Výbohová, Viera Kučerová, Iveta Čabalová, Andrzej Antczak, Dominika Szadkowska, Michał Drożdżek, Janusz Zawadzki

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Abstract

The aim of this study was to determine the changes occurring in the wood cellulose of the fast-growing poplar (Populus deltoides × maximowiczii) under the influence of steam explosion (SE) pretreatment. Cellulose from native wood and after pretreatment at 160 and 205 °C was isolated. Cellulose polymerization degree by size exclusion chromatography (SEC) and cellulose crystallinity index by Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR) were determined. The profiles of sugars in the native wood and in the solid fraction after pretreatment (using the acid hydrolysis method) were also determined. In addition, the profile of monosaccharides in the liquid fraction obtained after steam explosion and in the liquid fraction after acid hydrolysis of the oligosaccharides were investigated using high-performance liquid chromatography (HPLC). This allowed to determine the change in the yield of hexoses and pentoses in the studied material.

The behavior of cellulose in wood subjected to steam explosion at 160 and 205 °C and isolated by the Kürschner–Hoffer method was studied by determining the absorption bands of FTIR-ATR spectra. The lateral order index (LOI) of cellulose was calculated from the ratio of the intensity of the corresponding absorption bands A₁₄₂₂/A₈₉₆ cm⁻¹. Total crystallinity index (TCI) of cellulose was calculated from the ratio of the intensity of absorption bands A₁₃₇₂/A₂₉₀₀ cm⁻¹. TCI of Kürschner-Hoffer cellulose isolated from wood subjected to steam explosion at 160 and 205 °C decreased by 5.6 and 5.0%, respectively, with regard to the applied temperature. LOI increased in cellulose isolated from wood subjected to steam explosion at 160 °C (by 0.7%) and at 205 °C (by 19.2%) in relation to the index of cellulose isolated from native wood. Kürschner–Hoffer cellulose isolated from wood subjected to steam explosion at 160 and 205 °C exhibited, respectively, a reduced degree of polymerization of about 11% and about 8%. Polydispersity index in Kürschner–Hoffer cellulose was 1% lower after both pretreatments than native sample.

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汽爆预处理对速生杨（Populus deltoides × maximowiczii）木材所选糖类产量和纤维素结构的影响

本研究旨在确定速生杨（Populus deltoides × maximowiczii）木材纤维素在汽爆（SE）预处理影响下发生的变化。分离了原生木材和在 160 和 205 °C 下预处理后的纤维素。利用尺寸排阻色谱法（SEC）测定了纤维素聚合度，并利用傅立叶变换红外光谱-衰减全反射法（FTIR-ATR）测定了纤维素结晶度指数。此外，还测定了原生木材和预处理（使用酸水解法）后固体部分中的糖类分布。此外，还使用高效液相色谱法（HPLC）研究了蒸汽爆炸后液体部分和酸水解低聚糖后液体部分中单糖的分布情况。通过测定傅立叶变换红外-原子吸收光谱的吸收带，研究了在 160 和 205 °C 温度下进行蒸汽爆炸并用 Kürschner-Hoffer 法分离的木材中纤维素的行为。纤维素的侧序指数（LOI）是根据相应吸收带 A1422/A896 cm-1 的强度比计算得出的。纤维素的总结晶度指数（TCI）是根据吸收带 A1372/A2900 cm-1 的强度比计算得出的。在 160 和 205 °C 蒸汽爆炸条件下，从木材中分离出来的 Kürschner-Hoffer 纤维素的 TCI 分别比应用温度降低了 5.6% 和 5.0%。与从原生木材中分离出来的纤维素的指数相比，在 160 ℃ 和 205 ℃ 蒸汽爆炸条件下从木材中分离出来的纤维素的 LOI 分别增加了 0.7% 和 19.2%。从 160 ℃ 和 205 ℃ 蒸汽爆炸的木材中分离出来的 Kürschner-Hoffer 纤维素的聚合度分别降低了约 11% 和 8%。经过这两种预处理后，Kürschner-Hoffer 纤维素的多分散指数比原生样品低 1%。

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来源期刊

Wood Science and Technology 工程技术-材料科学：纸与木材

CiteScore

5.90

自引率

5.90%

发文量

审稿时长

3 months

期刊介绍： Wood Science and Technology publishes original scientific research results and review papers covering the entire field of wood material science, wood components and wood based products. Subjects are wood biology and wood quality, wood physics and physical technologies, wood chemistry and chemical technologies. Latest advances in areas such as cell wall and wood formation; structural and chemical composition of wood and wood composites and their property relations; physical, mechanical and chemical characterization and relevant methodological developments, and microbiological degradation of wood and wood based products are reported. Topics related to wood technology include machining, gluing, and finishing, composite technology, wood modification, wood mechanics, creep and rheology, and the conversion of wood into pulp and biorefinery products.