在从牛皮纸黑液中进行连续酸沉淀的过程中,通过物理化学改性调整木质素的抗氧化和抗菌特性

IF 3.1 2区 农林科学 Q1 FORESTRY
María E. Eugenio, Luisa García-Fuentevilla, Raquel Martín-Sampedro, José I. Santos, Bernd Wicklein, David ibarra
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引用次数: 0

摘要

将黑液废料中的木质素转化为高附加值的生物活性剂,是提高木质纤维素工业可持续性和盈利能力的可行途径之一。然而,由于木质素在化学和结构上的可变性,有必要从黑液中分离出特定的木质素馏分,以获得具有独特化学和结构特征的样品,从而获得特定的生物活性。在本研究中,通过在 pH 值为 7.5、5 和 2.5 的条件下进行连续酸沉淀,从牛皮纸黑液中分离出了杨木素馏分(分别称为 P-7.5、P-5 和 P-2.5),并根据其物理化学、抗氧化和抗菌特性对其进行了表征。一般来说,当 pH 值从 7.5 降到 2.5 时,木质素馏分的横向链(芳基-β 醚和 C-C)被广泛消除,因此酚含量高、分子量低。此外,热分析表明,P-7.5 木质素馏分的热稳定性高于 P-2.5 和 P-5。在抗氧化活性方面,与 P-5 和 P-2.5 相比,P-7.5 木质素馏分的 S/G 比率更高,氧化结构更少,因此具有更高的抗氧化活性。此外,所有木质素馏分对大肠杆菌的抗菌效果均低于对金黄色葡萄球菌的抗菌效果。其中,P-2.5 和 P-5 与 P-7.5 相比,酚含量更高,分子量值更低,对金黄色葡萄球菌的抗菌效果更好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tuning the antioxidant and antibacterial properties of lignin by physicochemical modification during sequential acid precipitation from Kraft black liquor

Turning lignin from black liquor waste into value-added bioactive agents is one of the possible routes for improving the sustainability and profitability of lignocellulosic industry. However, due to chemical and structural variability of lignin, it is necessary to isolate specific lignin fractions from black liquor with the purpose to achieve samples with unique chemical and structural characteristics and therefore, specific biological activities. In this study, poplar lignin fractions isolated from Kraft black liquor by sequential acid precipitation at pH´s 7.5, 5 and 2.5 (denoted as P-7.5, P-5 and P-2.5) were characterized according to their physicochemical, antioxidant and antibacterial properties. In general, lignin fractions displayed a wide elimination of lateral chains (aryl-β ether and C–C) and, therefore a high phenolic content and low molecular weight, as the pH sequential precipitation was decreased from 7.5 to 2.5. Moreover, thermal analysis revealed that the P-7.5 lignin fraction showed higher thermal stability than P-2.5 and P-5. In terms of antioxidant activity, the P-7.5 lignin fraction, with a higher S/G ratio and a less oxidized structure compared to P-5 and P-2.5, exhibited higher antioxidant activity. In addition, lower antibacterial effect was observed for all lignin fractions against Escherichia coli compared to that obtained against Staphylococcus aureus. Among them, the P-2.5 and P-5 fractions, with higher phenolic content and lower molecular weight values than P-7.5, showed a greater antibacterial effect against S. aureus.

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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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