脱木素植物纤维的拉曼光谱:探索木聚糖的存在对纤维素光谱特征的影响

IF 4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Fibers Pub Date : 2023-12-27 DOI:10.3390/fib12010005
U. Agarwal, S. Ralph
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引用次数: 0

摘要

木材和植物是由纤维素、木质素和半纤维素组成的。木聚糖和半乳甘露聚糖是主要的次生细胞壁半纤维素。在现代,纤维是生物精炼工业和开发生物复合材料的重要材料。对于这些和其他应用,纤维的结构分析非常重要,拉曼光谱是众多分析技术中的一种。然而,鉴于半纤维素和纤维素之间的结构相似性,它们的许多拉曼贡献是重叠的,而半纤维素的重叠特征在多大程度上改变了纤维素的光谱尚未完全清楚。本研究通过对半纤维素之一的木聚糖进行研究,重点关注这方面的问题。作为模型系统,制备了不同质量比的棉微晶纤维素(MCC)和木聚糖(桦木)样品,并使用傅立叶变换拉曼光谱进行了分析。在大多数情况下,拉曼强度与样品成分有关,当所选频带强度与木聚糖含量作图时,可获得良好的线性相关关系(R2 在 0.69 和 1.0 之间)。结果表明,随着木聚糖含量的增加,1460、898 和 494 cm-1 处的峰强度增加,而 1480、1121、1096 和 520 cm-1 处的峰强度下降。此外,各种混合物样品中 MCC 带的强度变化(%)与 MCC 的馏分有关,这表明在大多数情况下,混合物的强度增加了,并且与混合物中的木聚糖含量高度相关(R2 在 0.75 和 0.97 之间)。这些发现被用于解释某些含木聚糖的木质化植物纤维的拉曼光谱。希望本研究获得的见解能更好地解释天然和处理过的植物材料的光谱。
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Raman Spectra of Delignified Plant Fibers: Exploring the Impact of Xylan’s Presence on the Spectral Features of Cellulose
Wood and plants are made of fibers that contain, in addition to cellulose, lignin and hemicelluloses. Xylan and galactoglucomannan are the dominant secondary cell wall hemicelluloses. In modern times, fibers are important materials for the biorefinery industry and for developing biocomposites. For these and other applications, the structural analysis of fibers is important, and Raman spectroscopy is among the many analytical techniques used. However, given the structural similarity between hemicelluloses and cellulose, many of their Raman contributions overlap, and the extent to which the overlapping features of hemicellulose modify the spectrum of cellulose is not yet fully understood. The present investigation focuses on this aspect by examining xylan, one of the hemicelluloses. As a model system, samples with various mass ratios of cotton microcrystalline cellulose (MCC) and xylan (birch wood) were prepared and analyzed using FT-Raman spectroscopy. In most cases, the Raman intensities were sample-composition-dependent, and, when the selected band intensities were plotted against the xylan content, good linear correlations (with an R2 between 0.69 and 1.0) were obtained. The results indicated that with increased xylan content, the peak intensities increased at 1460, 898, and 494 cm−1 and declined at 1480, 1121, 1096, and 520 cm−1. Additionally, intensity changes (%) in the MCC bands with respect to MCC’s fractions in various mixture samples showed that, in most cases, the mixture intensities increased and were highly correlated with the xylan amounts in the mixtures (with an R2 between 0.75 and 0.97). These findings were applied to interpret Raman spectra of selected xylan-containing delignified plant fibers. It is hoped that the insights gained in this study will allow for better interpretation of the spectra of natural and treated plant materials.
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来源期刊
Fibers
Fibers Engineering-Civil and Structural Engineering
CiteScore
7.00
自引率
7.70%
发文量
92
审稿时长
11 weeks
期刊介绍: Fibers (ISSN 2079-6439) is a peer-reviewed scientific journal that publishes original articles, critical reviews, research notes and short communications on the materials science and all other empirical and theoretical studies of fibers, providing a forum for integrating fiber research across many disciplines. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files or software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. The following topics are relevant and within the scope of this journal: -textile fibers -natural fibers and biological microfibrils -metallic fibers -optic fibers -carbon fibers -silicon carbide fibers -fiberglass -mineral fibers -cellulose fibers -polymer fibers -microfibers, nanofibers and nanotubes -new processing methods for fibers -chemistry of fiber materials -physical properties of fibers -exposure to and toxicology of fibers -biokinetics of fibers -the diversity of fiber origins
期刊最新文献
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