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Article Dans Une Revue Carbohydrate Polymers Année : 2021

Release of internal molecular torque results in twists of Glaucocystis cellulose nanofibers

Résumé

9 The cellulose of the green alga Glaucocystis consists of almost pure Iα crystalline phase 10 where the corresponding lattice b* axis parameter lies perpendicular to the cell wall surface 11 in the multilamellar cell wall architecture, indicating that in this wall, cellulose is devoid of 12 longitudinal twist. In contrast, when isolated from Glaucosytis cell walls, the cellulose 13 microfibrils present a twisting behavior, which was investigated using electron microscopy 14 techniques. Sequential electron microdiffraction analyses obtained under frozen hydrated 15 conditions revealed that the cellulose microfibrils continuously right-hand twisted in the 16 vitreous ice layer. This observation implies that the twists of these nanofibers are intrinsic to 17 the cellulose molecule and not a result of the cell wall biogenesis process. Furthermore, 18 scaling with the fourth power of width based on the classic mechanics of solid, the twist 19 angle was in agreement with the reported values in higher plant celluloses, implying that the 20 twist arises from the balance between tendency of individual chains to twist and the structure 21 imposed by the crystal packing. The observed twist in isolated fibrils of Glaucocystis 22 indicates that one cannot assume the presence of cellulose twisting in vivo based on 23 observations of isolated cellulose nanoparticles, as microfibril can exist untwisted in the 24 original cell wall but become twisted when released from the wall. 25

Domaines

Chimie Matériaux
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Dates et versions

hal-02977831 , version 1 (14-11-2020)

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Yu Ogawa. Release of internal molecular torque results in twists of Glaucocystis cellulose nanofibers. Carbohydrate Polymers, 2021, 251, pp.117102. ⟨10.1016/j.carbpol.2020.117102⟩. ⟨hal-02977831⟩
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