Importance of Water in Maintaining Softwood Secondary Cell Wall Nanostructure.
Importance of Water in Maintaining Softwood Secondary Cell Wall Nanostructure.
复制标题
DOI：
10.1021/acs.biomac.1c00937
复制
发表时间：
2021-11-08
影响因子：
6.2
通讯作者：
Hill S
中科院分区：
文献类型：
--
作者：
Cresswell R;Dupree R;Brown SP;Pereira CS;Skaf MS;Sorieul M;Dupree P;Hill S
水是活体植物细胞壁质量的主要成分之一。然而，其作用和与次生细胞壁多糖的相互作用以及脱水和随后的再水化对分子结构的影响仍有待阐明。这项工作结合了多维固态13 C魔角旋转（MAS）核磁共振（NMR）与分子动力学建模，以破译水在软木次生细胞壁分子结构中的作用。所有的主要聚合物，它们的分子构象，和相互作用能之间的接近度进行比较从未干燥，烘干，和再水合状态。水被证明在半纤维素-纤维素界面处起关键作用。在脱水引起的显著分子收缩后，再水化后原始分子构象不能完全恢复。这些变化包括木聚糖变得与纤维素更紧密和不可逆地结合，一些甘露聚糖变得更移动的并改变构象。这些不可逆的纳米结构变化为解释和改善木质材料的性能提供了基础。
Water is one of the principal constituents by mass of living plant cell walls. However, its role and interactions with secondary cell wall polysaccharides and the impact of dehydration and subsequent rehydration on the molecular architecture are still to be elucidated. This work combines multidimensional solid-state 13C magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) with molecular dynamics modeling to decipher the role of water in the molecular architecture of softwood secondary cell walls. The proximities between all main polymers, their molecular conformations, and interaction energies are compared in never-dried, oven-dried, and rehydrated states. Water is shown to play a critical role at the hemicellulose–cellulose interface. After significant molecular shrinkage caused by dehydration, the original molecular conformation is not fully recovered after rehydration. The changes include xylan becoming more closely and irreversibly associated with cellulose and some mannan becoming more mobile and changing conformation. These irreversible nanostructural changes provide a basis for explaining and improving the properties of wood-based materials.
登录
查看更多内容
影响因子：
3.2
作者：
HORII, F;HIRAI, A;KITAMARU, R
通讯作者：
KITAMARU, R
影响因子：
41.2
作者：
Keckes, J;Burgert, I;Fratzl, P
通讯作者：
Fratzl, P
影响因子：
5.5
作者：
Guvench, Olgun;Hatcher, Elizabeth;Venable, Richard M.;Pastor, Richard W.;MacKerell, Alexander D., Jr.
通讯作者：
MacKerell, Alexander D., Jr.
影响因子：
4.4
作者：
JORGENSEN, WL;CHANDRASEKHAR, J;KLEIN, ML
通讯作者：
KLEIN, ML
影响因子：
3.3
作者：
Fratzl, P;Burgert, I;Gupta, HS
通讯作者：
Gupta, HS