Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5156639 | Carbohydrate Polymers | 2017 | 14 Pages |
Abstract
The structure of cellulose microfibrils in mature cotton fibres from three varieties - Gossypium hirsutum, G. barbadense and G. arboreum - has been investigated by a multi-technique approach combining small angle scattering techniques with spectroscopy and diffraction. Cellulose microfibrils present a Iβ-rich 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.
Related Topics
Physical Sciences and Engineering
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Authors
Marta MartÃnez-Sanz, Filomena Pettolino, Bernadine Flanagan, Michael J. Gidley, Elliot P. Gilbert,