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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Acetylation and Sugar Composition Influence the (In)Solubility of Plant beta-Mannans and Their Interaction with Cellulose Surfaces
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Acetylation and Sugar Composition Influence the (In)Solubility of Plant beta-Mannans and Their Interaction with Cellulose Surfaces

机译：乙酰化和糖组合物影响植物β-甘露体的（In）溶解度及其与纤维素表面的相互作用

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摘要

Plant beta-mannans are complex heteropolysaccharides that represent an abundant resource from lignocellulosic biomass. The influence of the molecular motifs of plant mannans on the backbone flexibility, solubility, and the interaction with cellulose was investigated by computational and experimental approaches. The regioselectivity of the acetyl substitutions at C2 and C3 distinctively influenced backbone flexibility in aqueous media, as revealed by molecular dynamic simulations. The molecular weight and degree of acetylation were tailored for two model seed mannans (galactomannan and glucomannan) and compared to spruce acetylated galactoglucomannan. The thermal stability was enhanced with increasing acetyl substitutions, independently of the type of mannan. Dynamic light scattering and atomic force microscopy revealed that the occurrence of galactosylation and a low degree of acetylation (similar to that of native acetylated galactoglucomannans) enhanced solubility/dispersibility of mannans, whereas the solubility/dispersibility decreased for higher degrees of acetylation. Mannan solubility influenced their interactions with cellulose at water-cellulose interfaces in terms of adsorbed mass and viscoelastic properties of the adsorbed mannan layers. Our results reveal that modulating the molecular motifs of plant beta-mannans influences their macromolecular conformation and physicochemical properties, with fundamental implications for their role in the plant cell wall and the design of wood-based materials.
机译：植物β-甘露体是复杂的杂多糖，其代表木质纤维素生物质的丰富资源。通过计算和实验方法研究了植物甘露甘露植物分子基质对骨干柔性，溶解性和与纤维素相互作用的影响。 C2和C3在C2和C3的乙酰取代的区域选择性地影响了水性介质中的骨干柔性，如分子动态模拟所揭示的那样。对于两种模型种子甘露甘露聚糖（Galactomannan和Glucomannan）定制了乙酰化的分子量和乙酰化程度，并与溢乙酰化吡酰胺甘露糖胺胰岛相比。随着乙酰基取代，乙酰基取代，独立于甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘露甘油。动态光散射和原子力显微镜揭示了半乳糖基化的发生和低乙酰化（与天然乙酰化的吡酰胺葡聚糖胰岛素）的出现增强了甘露体的溶解度/分散性，而溶解度/分散性降低以较高的乙酰化。在吸附的甘露植物层的吸附质量和粘弹性特性方面，甘露甘露溶解度影响其与水 - 纤维素界面的纤维素相互作用。我们的研究结果表明，调节植物β-甘露体的分子基质影响其大分子构象和物理化学特性，对其在植物细胞壁中的作用以及木材基材料的设计具有根本的影响。

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