Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 47, Pages E1195-E1203Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1108942108
Keywords
crystallinity; infrared; deuterium exchange; nuclear magnetic resonance; spin diffusion
Categories
Funding
- UK Engineering and Physical Science Research Council [EP/E026583/1]
- Scottish Funding Council
- Rigaku Europe
- Institut Laue-Langevin, Grenoble, France
- Engineering and Physical Sciences Research Council [EP/E026583/1] Funding Source: researchfish
- EPSRC [EP/E026583/1] Funding Source: UKRI
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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.
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