期刊
CARBOHYDRATE POLYMERS
卷 175, 期 -, 页码 450-463出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.07.090
关键词
Small angle scattering; Neutron scattering; Cotton; Cellulose; Plant cell walls
资金
- ANSTO [CE110001007]
- Australian Research Council Centre of Excellence in Plant Cell Walls [CE110001007]
- CSIRO
- Cotton Seed Distributors
The structure of cellulose microfibrils in mature cotton fibres from three varieties-Gossypium hirsuturn, G. barbadense and G. arboreum-has been investigated by a multi-techniqueapproach combining small angle scattering techniques with spectroscopy and diffraction. Cellulose microfibrils present a iprich crystalline structure with limited surface disorder. Small angle scattering (SAXS and SANS) data have been successfully fitted using a core-shell model and the results obtained indicate that the cellulose microfibrils, formed by the association of 2-3 elementary fibrils, are composed of a ca. 2 nm impermeable crystalline core, surrounded by a partially hydrated paracrystalline shell, with overall cross-sections of ca. 3.6-4.7 nm. Different low levels of cell wall matrix components have a strong impact on the microfibril architecture and enable moisture penetration upon hydration. Furthermore, the higher amounts of non-cellulosic components in G. barbadense result in a less dense packing of cellulose microfibrils and increased solvent accessibility. (C) 2017 Elsevier Ltd. All rights reserved.
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