Nanostructure of cellulose microfibrils in spruce wood
Nanostructure of cellulose microfibrils in spruce wood
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DOI：
10.1073/pnas.1108942108
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发表时间：
2011-11-22
影响因子：
11.1
通讯作者：
Jarvis, Michael C.
中科院分区：
文献类型：
--
作者：
Fernandes, Anwesha N.;Thomas, Lynne H.;Jarvis, Michael C.
木材中纤维素微原纤维的结构尚不清楚，尽管木质生物质中纤维素含量丰富，对生物、能源和工程具有重要意义。利用小角中子和广角x射线散射等光谱方法研究了云杉木纤维素微纤维的结构。散射数据与24链微原纤维一致，并倾向于疏水和亲水表面均暴露的“矩形”模型。链式排列和氢键的无序从微纤维中心向外增加。紊乱的程度模糊了I α和I β异型之间的区别。表面链的构象明显，在C-6处构象紊乱程度高，分子内氢键较少，向外氢键较多。轴向紊乱可以用微原纤维的扭曲来解释，这对它们的生物合成有影响。
The structure of cellulose microfibrils in wood is not known in detail, despite the abundance of cellulose in woody biomass and its importance for biology, energy, and engineering. The structure of the microfibrils of spruce wood cellulose was investigated using a range of spectroscopic methods coupled to small-angle neutron and wide-angle X-ray scattering. The scattering data were consistent with 24-chain microfibrils and favored a "rectangular" model with both hydrophobic and hydrophilic surfaces exposed. Disorder in chain packing and hydrogen bonding was shown to increase outwards from the microfibril center. The extent of disorder blurred the distinction between the I alpha and I beta allomorphs. Chains at the surface were distinct in conformation, with high levels of conformational disorder at C-6, less intramolecular hydrogen bonding and more outward-directed hydrogen bonding. Axial disorder could be explained in terms of twisting of the microfibrils, with implications for their biosynthesis.