Poroelastic mechanical effects of hemicelluloses on cellulosic hydrogels under compression

PloS One
Patricia Lopez-SanchezMichael J Gidley

Abstract

Hemicelluloses exhibit a range of interactions with cellulose, the mechanical consequences of which in plant cell walls are incompletely understood. We report the mechanical properties of cell wall analogues based on cellulose hydrogels to elucidate the contribution of xyloglucan or arabinoxylan as examples of two hemicelluloses displaying different interactions with cellulose. We subjected the hydrogels to mechanical pressures to emulate the compressive stresses experienced by cell walls in planta. Our results revealed that the presence of either hemicellulose increased the resistance to compression at fast strain rates. However, at slow strain rates, only xyloglucan increased composite strength. This behaviour could be explained considering the microstructure and the flow of water through the composites confirming their poroelastic nature. In contrast, small deformation oscillatory rheology showed that only xyloglucan decreased the elastic moduli. These results provide evidence for contrasting roles of different hemicelluloses in plant cell wall mechanics and man-made cellulose-based composite materials.

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Citations

Mar 19, 2016·Journal of Experimental Botany·Gleb E YakubovJason R Stokes
May 15, 2016·Carbohydrate Polymers·Marta Martínez-SanzElliot P Gilbert
Apr 23, 2015·Soft Matter·Patricia Lopez-SanchezAnna Strom
Jul 31, 2016·Carbohydrate Polymers·Patricia Lopez-SanchezMichael J Gidley
Sep 19, 2020·Nature Communications·Jennie BerglundFrancisco Vilaplana

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Methods Mentioned

BETA
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