Unlocking the potential of undervalued forest residues: a comprehensive characterization of eucalypt stump in the biorefinery context

IF 3.1 2区 农林科学 Q1 FORESTRY
Jorge Gominho, Anouck Habrant, Ricardo A. Costa, Brigitte Chabbert, Ana Lourenço
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Abstract

Eucalyptus globulus stumps are a by-product from the coppice pulp plantation after three generations. In this study a stump was fractionated in three discs (60 cm between them), and their constituent tissues—heartwood, sapwood and bark—were subjected to further chemical characterization by summative analysis, evaluation of the phytochemical profile and antioxidants activities, plus GC/MS and analytical pyrolysis aiming at their valorization. Wood density was similar between tissues and disc level: values ranging from 0.652 to 0.705 g/cm3 (Disc 1) and 0.605 g/cm3 (Disc 5). Bark had high ash (3.5%), extractives (7.5%) and holocellulose (68.4%) but lower lignin contents (22.0%). Original heartwood contained 0.7% ash, 7.0% extractives, 27.1% lignin, and 67.3% holocellulose. Heartwood showed high extractives (12.1–15.8%), less lignin (23.9–24.5%), and high holocellulose (61.7–64.7%) compared to sapwood which contained 3.9–5.4% extractives, 26.9–27.3% lignin and 68.6–71.5% holocellulose. Water extracts had poor antioxidant activity in contrast to ethanol extracts with high activities in heartwood. All tissues presented GS lignin type with S/G ratios varying from 3.0 to 3.4 (heartwood), 3.2–3.4 (sapwood), bark (3.5) and 3.8 (original heartwood). In wood, fibers and vessels were highly lignified with SG and G-lignin respectively; while rays had low lignin with G-type. Light and fluorescence macroscopic observation of the tissues in Disc 1 revealed a lower proportion and larger vessels in sapwood and high emission fluorescence at 488nm. Overall, these results show that stumps are valuable raw material to be used under the biorefinery context.

解锁被低估的森林残留物的潜力:桉树树桩在生物炼制背景下的综合表征
蓝桉树桩是木浆人工林三代后的副产品。在本研究中,将一个树桩分成三盘(间距60 cm),并对其组成组织-心材,边材和树皮-进行进一步的化学表征,通过总结分析,评估植物化学特征和抗氧化活性,再加上GC/MS和分析热解以实现其价值。木材密度在组织和盘级之间相似,值为0.652 ~ 0.705 g/cm3(盘1)和0.605 g/cm3(盘5)。树皮具有高灰分(3.5%)、提取物(7.5%)和全纤维素(68.4%),但木质素含量较低(22.0%)。原材含灰分0.7%,提取物7.0%,木质素27.1%,纤维素67.3%。心材提取物含量高(12.1 ~ 15.8%),木质素含量低(23.9 ~ 24.5%),整体纤维素含量高(61.7 ~ 64.7%),而边缘材提取物含量为3.9 ~ 5.4%,木质素含量为26.9 ~ 27.3%,整体纤维素含量为68.6 ~ 71.5%。水提取物的抗氧化活性较低,而乙醇提取物的抗氧化活性较高。所有组织均呈现GS木质素型,S/G比值分别为3.0 ~ 3.4(心材)、3.2 ~ 3.4(边材)、3.5(树皮)和3.8(原心材)。在木材中,纤维和血管分别被SG和g木质素高度木质化;射线木质素含量低,呈g型。对Disc 1的组织进行光镜和荧光宏观观察,边材血管比例较低,血管较大,在488nm处荧光发射较高。总的来说,这些结果表明树桩是有价值的原料,可以在生物炼制环境下使用。
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来源期刊
Wood Science and Technology
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
75
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.
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